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  • 1.
    Ali, Sharafat
    et al.
    Linnaeus University, Sweden.
    Wójcik, Natalia A.
    Linnaeus University, Sweden; Gdańsk University of Technology, Poland.
    Hakeem, Abbas Saeed
    King Fahd University of Petroleum and Minerals, Saudi Arabia.
    Gueguen, Yann
    Université de Rennes, France.
    Karlsson, Stefan
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Effect of composition on the thermal properties and structure of M-Al-Si-O-N glasses, M = Na, Mg, Ca2024Inngår i: Progress in Solid State Chemistry, ISSN 0079-6786, E-ISSN 1873-1643Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The primary objective of this study is to explore the relationship between the composition, structure, and thermal characteristics of M-Al-Si-O-N glasses, with M representing sodium (Na), magnesium (Mg), or calcium (Ca). The glasses were prepared by melting in a quartz crucible at 1650 °C and AlN precursor (powder) was utilized as a nitrogen source. The measured thermal properties studied were glass transition temperature (Tg), crystallization temperature (Tc), glass stability, viscosity, and thermal expansion coefficient (α). The findings indicate that increasing the aluminum content leads to higher glass transition, crystallization temperatures, and viscosities. In contrast, fragility values increase with the Al contents, while modifier elements and silicon content influence thermal expansion coefficient values. FTIR analysis revealed that in all glasses, the dominant IR bands are attributed to the presence of Q2 and Q3 silicate units. The effect of Al is observed as a progressive polymerization of the silicate network resulting from the glass-forming role of Al2O3. In most samples, the Q4 silicate mode was also observed, strongly related to the high Al content. Overall, the study shows that the complexity of composition-property correlations where the structural changes affect the properties of Mg/Ca-based oxynitride glasses has potential implications for their use in various technological fields.

  • 2.
    Allsopp, Ben
    et al.
    Sheffield Hallam University, UK.
    Orman, Robin
    Johnson, Simon R.
    Baistow, Ian
    Lundstedt, Karin
    RISE., SP – Sveriges Tekniska Forskningsinstitut, Glafo Glasforskningsinstitutet.
    Sundberg, Peter
    RISE., SP – Sveriges Tekniska Forskningsinstitut, Glafo Glasforskningsinstitutet.
    Baquedano-Peralvarez, Estela
    CSIC Spanish National Research Council, Spain.
    Stålhandske, Christina
    RISE., SP – Sveriges Tekniska Forskningsinstitut, Glafo Glasforskningsinstitutet.
    Andersson, Anne
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Postigo, Pablo Aitor
    CSIC Spanish National Research Council, Spain.
    Booth, Jonathan
    Bingham, Paul A.
    Sheffield Hallam University, UK.
    Karlsson, Stefan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, Glafo Glasforskningsinstitutet.
    Towards ultra-thin glasses for solar energy applications2016Konferansepaper (Annet vitenskapelig)
  • 3.
    Allsopp, Benjamin
    et al.
    Sheffield Hallam University, UK.
    Orman, Robin
    Johnson Matthey Technology Centre, UK.
    Johnson, Simon
    Johnson Matthey Technology Centre, UK.
    Baistow, Ian
    Solar Capture Technologies, UK.
    Sanderson, Gavin
    Solar Capture Technologies, UK.
    Sundberg, Peter
    RISE Research Institutes of Sweden, Material och produktion, Kemi, biomaterial och textil.
    Stålhandske, Christina
    RISE Research Institutes of Sweden, Samhällsbyggnad, Bygg och fastighet.
    Grund Bäck, Lina
    RISE Research Institutes of Sweden.
    Andersson, Anne
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Booth, Jonathan
    Johnson Matthey Technology Centre, UK.
    Bingham, Paul
    Sheffield Hallam University, UK.
    Karlsson, Stefan
    RISE Research Institutes of Sweden, Samhällsbyggnad, Bygg och fastighet.
    Towards improved cover glasses for photovoltaic devices2020Inngår i: Progress in Photovoltaics, ISSN 1062-7995, E-ISSN 1099-159X, Vol. 28, s. 1187-1206Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    For the solar energy industry to increase its competitiveness, there is a global drive to lower the cost of solar-generated electricity. Photovoltaic (PV) module assembly is material-demanding, and the cover glass constitutes a significant proportion of the cost. Currently, 3-mm-thick glass is the predominant cover material for PV modules, accounting for 10%–25% of the total cost. Here, we review the state-of-the-art of cover glasses for PV modules and present our recent results for improvement of the glass. These improvements were demonstrated in terms of mechanical, chemical and optical properties by optimizing the glass composition, including addition of novel dopants, to produce cover glasses that can provide (i) enhanced UV protection of polymeric PV module components, potentially increasing module service lifetimes; (ii) re-emission of a proportion of the absorbed UV photon energy as visible photons capable of being absorbed by the solar cells, thereby increasing PV module efficiencies and (iii) successful laboratory-scale demonstration of proof of concept, with increases of 1%–6% in Isc and 1%–8% in Ipm. Improvements in both chemical and crack resistance of the cover glass were also achieved through modest chemical reformulation, highlighting what may be achievable within existing manufacturing technology constraints. © 2020 The Authors.

    Fulltekst (pdf)
    fulltext
  • 4.
    Bengtsson, Felix
    et al.
    Uppsala University, Sweden.
    Pehlivan, Ilknur Bayrak
    Uppsala University, Sweden.
    Österlund, Lars
    Uppsala University, Sweden.
    Karlsson, Stefan
    RISE Research Institutes of Sweden, Samhällsbyggnad, Bygg och fastighet.
    Alkali ion diffusion and structure of chemically strengthened TiO2 doped soda-lime silicate glass2022Inngår i: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 586, s. 121564-121564, artikkel-id 121564Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Diffusion kinetics and structural properties of chemically strengthened titania-doped soda-lime silicate glasses were studied by depth-resolved X-ray photoelectron spectroscopy, Raman spectroscopy and spectrophotometry. The glasses were ion exchanged, whereby Na+ in the glass was replaced by K+ in a molten salt bath, at four different treatment temperatures between 350 and 500 °C. The alkali diffusion coefficient, DK-Na, and corresponding activation energy were calculated to be between 3.26×10−12 and 4.47×10−11 cm2s−1 and between 101.1 kJmol−1 and 105.6 kJmol−1, respectively. DK-Na was observed to decrease as the TiO2 concentration was increased. Raman analysis showed Q3-silicate species with different bond lengths, which was attributed to surface compressive stresses, and increasing Si-O-Si bond angle with increasing ion exchange temperature. Ti3+ ions exist as a minor species in the glasses and its concentration depends on the TiO2 content. Deconvolution of the optical absorption spectra reveals Jahn-Teller compressive distortion of the Ti3+ octahedral coordination.

    Fulltekst (pdf)
    fulltext
  • 5.
    Bengtsson, Felix
    et al.
    Uppsala University.
    Pehlivan, Ilknur Bayrak
    Uppsala University.
    Österlund, Lars
    Uppsala University.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Dataset: Alkali Ion diffusion and structure of chemically strengthened TiO2 doped soda-lime silicate glass2022Dataset
    Abstract [en]

    Diffusion kinetics and structural properties of chemically strengthened titania-doped soda-lime silicate glasses were studied by depth-resolved X-ray photoelectron spectroscopy, Raman spectroscopy and spectrophotometry.

    Chemical strengthening (CS) is frequently used to strengthen thin glasses. CS of glass is based on ion exchange of larger ions from a molten salt into glass. Both the ion and counter ion are conventionally monovalent alkali ions.

    Diffusion kinetics and structural properties of chemically strengthened titania-doped (TiO2) soda-lime silicate (SLS) glasses were studied by depth-resolved X-ray photoelectron spectroscopy, Raman spectroscopy and spectrophotometry. The glasses were ion exchanged, whereby Na+ in the glass was replaced by K+ in a molten salt bath, at four different treatment temperatures between 350 and 500 °C.

    The following samples were prepared and analyzed by X-ray Photoelectron Spectroscopy (XPS): (1) SLS, (2) 4.7% TiO2, and (3) 9.9% TiO2. The ion exchange procedure was performed for 5 h at four different temperatures below Tg (350, 400, 450 and 500 °C). Before XPS measurements, the samples were wet-etched using hydrofluoric (HF) acid to produce samples with six different etching depths.

    The Raman scattered light was detected in the backscattering configuration employing linear polarization and 2400 lines/mm grating, and a 100x objective lens. Depth profile spectra were collected at six different depths of 0, 10, 20, 30, 40, and 50 µm for each glass sample, employing 12 scans with a 10 s exposure time for each scan.

    Spectrophotometric measurements were conducted before and after K+/Na+ ion-exchange treatmeatment for 5 h at 500 °C, collected between 300 and 2500 nm.

  • 6.
    Eder, Gabriele
    et al.
    OFI, Austria.
    Peharz, Gerhard
    Joanneum Research, Austria.
    Trattnig, Roman
    Joanneum Research, Austria.
    Bonomo, Pierluigi
    SUPSI University of Applied Sciences and Art of Southern Switzerland, Switzerland.
    Saretta, Erika
    SUPSI University of Applied Sciences and Art of Southern Switzerland, Switzerland.
    Frontini, Francesco
    SUPSI University of Applied Sciences and Art of Southern Switzerland, Switzerland.
    Polo López, Cristina S.
    SUPSI University of Applied Sciences and Art of Southern Switzerland, Switzerland.
    Wilson, Helen Rose
    Fraunhofer Institute for Solar Energy Systems ISE, Germany.
    Eisenlohr, Johannes
    Fraunhofer Institute for Solar Energy Systems ISE, Germany.
    Chivelet, Nuria Martin
    CIEMAT, Spain.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Jakica, Nebojsa
    Politecnico di Milano, Italy.
    Zanelli, Alessandra
    Politecnico di Milano, Italy.
    Coloured BIPV : Market, Research and Development2019Rapport (Annet vitenskapelig)
    Abstract [en]

    In the building sector, net-zero energy performance targets and reduction of CO2 emissions are the main drivers for building integrated photovoltaics. Recent market studies [10,18,19] show the history and perspective of the global market in the BIPV sector and calculate a global compound annual growth rate of ~ 40 % from 2009 up to 2020.

    In Europe, the BIPV market is in a transition. The past decades of a slowly emerging BIPV market have been characterized by the original dominant value of BIPV: a building that communicates an image of sustainability and innovation. Payback time or "return on investment" have not been the major parameters in the decision process for applying BIPV. This is changing now. In most European countries, the new regulations on energy performance in buildings (derived from the European Energy Performance of Buildings Directive and the Directive on energy efficiency) have been translated in national regulations/laws, stating that all new (and freshly refurbished) buildings of the EU member states should be nearly zero energy buildings (nZEBs) by 2020. Thus, the time for the regulations to become mandatory is very near. It is expected that the energy performance regulations are now taking over as the main driving factor for the BIPV market and that should have huge consequences in removing the difference between a conventional building component and a BIPV component both in aesthetical and construction terms. This has led to intensified research and development aiming to create BIPV products that come in a variety of colours and sizes, while at the same time being as close as possible to existing building components, to its requirements and how it is considered by the construction industry.

    The given market overview of state-of-the-art coloured BIPV products clearly reveals that for all parts of a BIPV module (glass, polymers, PV-active layers), there are technical solutions available for colouring. Pilot projects utilizing coloured BIPV products have been built in numerous (mainly European) cities clearly demonstrating the maturity of these solutions.

    The key aspect that has been slowing down the progress of implementation of these aesthetically appealing and technically sophisticated new products into a wider market are the costs. In this respect, a lot of effort has been made to improve and optimize the relationship between colour and efficiency/power generation of BIPV elements. The results of the past and on-going innovative research and intensified fundamental considerations are also summarized in this report.

    Besides the colour perception of the coloured BIPV elements under solar irradiation which is essential for the acceptance of the exterior appearance of a building, also transparency and inside visual comfort of BIPV – windows and façade elements are essential for the users and inhabitants.

    Fulltekst (pdf)
    fulltext
  • 7.
    Ekström, E.
    et al.
    Linköping University, Sweden.
    Tenö, J.
    Linköping University, Sweden.
    Valyukh, I.
    Linköping University, Sweden.
    Tiwari, A.
    Linköping University, Sweden.
    Karlsson, Stefan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, Glafo Glasforskningsinstitutet.
    Eklund, P.
    Linköping University, Sweden.
    Development of “Self-Cleaning” and Anti-Reflective Coating on Flat Glass Based on Zinc Oxide2015Konferansepaper (Annet vitenskapelig)
  • 8.
    Grund Bäck, Lina
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för byggd miljö och energiteknik (BET)..
    Ali, Sharafat
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för byggd miljö och energiteknik (BET)..
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Jonson, Bo
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för byggd miljö och energiteknik (BET)..
    Physical properties and Raman Spectroscopy of mixed alkali/alkaline earth silicate glassesManuskript (preprint) (Annet vitenskapelig)
  • 9.
    Grund Bäck, Lina
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Ali, Sharafat
    Linnaeus University, Sweden.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Möncke, Doris
    Linnaeus University, Sweden.
    Kamitsos, Efstratios I.
    National Hellenic Research Foundation, Greece.
    Jonson, Bo
    Linnaeus University, Sweden.
    Mixed alkali/alkaline earth-silicate glasses: Physical properties and structure by vibrational spectroscopy2019Inngår i: International Journal of Applied Glass Science, ISSN 2041-1286, Vol. 10, nr 3, s. 349-362Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this article, we investigate the correlation of selected physical properties with structural changes in quaternary mixed modifier alkali/alkaline earth oxide silicate glass  systems,  focusing  either  on  the  mixed  alkali  effect  [(20−x)Na2O–xK2O– 10CaO–70SiO2 (x = 0, 5, 10, 15, 20)] or on the mixed alkaline earth effect [20Na2O– (10−y)CaO–yBaO–70SiO2 (y = 0, 5, 10)]. A maximum microhardness and packing density, as well as a minimum glass transition temperature were observed for mixed alkali glasses. The mixed alkaline earth glasses do not exhibit any clear extrema in any  of  the  properties  studied.  The  hardness  and  glass  transition  temperature  de-creases, while the density and molar volume increases with increasing BaO content. Raman spectroscopy showed an increase in the Q3 group compared to the Q2 and Q4 groups as the high field strength ions Na+ or Ca2+ are substituted by their low field strength analogs K+  or Ba2+. In the mixed alkali series, the high field strength ion Na+, seems to push the low field strength ion K+ into lower energy sites when present simultaneously, while such an effect is not apparent for the mixed alkaline earth glasses, where the far IR spectra of mixed glasses are equivalent to the weighted averages of the pure glasses.

    Fulltekst (pdf)
    fulltext
  • 10.
    Grund Bäck, Lina
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik. Linneaus Univerrsity, Sweden.
    Ali, Sharafat
    Linnaeus University, Sweden.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik. University of Jena, Germany.
    Wondraczek, Lothar
    University of Jena, Germany.
    Jonson, Bo
    Linnaeus University, Sweden.
    X-ray and UV–Vis-NIR absorption spectroscopy studies of the Cu (I) and Cu (II) coordination environments in mixed alkali-lime-silicate glasses2019Inngår i: Journal of Non-Crystalline Solids: X, ISSN 2590-1591, Vol. 3, artikkel-id 100029Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The local structures of Cu(I) and Cu(II) in (20-x)Na2O-xK2O-10CaO-70SiO2 glasses with a copper content of 0.4 mol% have been investigated by Cu K-edge extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES). Complementary data for Cu(II) was derived using UV–Vis-NIR spectroscopy. Indication for mainly linear two-fold coordination of the Cu+ ion was found by both EXAFS and XANES, but other coordination between Cu+ and O2– cannot be excluded. The Cu(I)-O bond lengths were found to be 1.79–1.83 ± 0.02 Å. EXAFS results showed that Cu(II) was mostly present in a Jahn-Teller distorted environment with oxygen, an octahedron with four shorter Cu(II)-O bonds and two longer in axial position. The equatorial bond lengths were found to be 1.89–1.91 ± 0.02 Å and the axial 2.20–2.24 ± 0.02 Å with no effect of the Jahn-Teller distortion of the octahedron when the glass composition was altered.

    Fulltekst (pdf)
    fulltext
  • 11.
    Grund Bäck, Lina
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Lundstedt, Karin
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Sundberg, Peter
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Orman, Robin
    Johnson Matthey Technology Centre, UK.
    Stålhandske, Christina
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Booth, Jonathan
    Johnson Matthey Technology Centre, UK.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Improved mechanical properties and chemical durability by modifying the float glass composition and thermo-chemical strengthening for photovoltaic cover glass2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Solar energy is promising renewable energy where glass is an important material and have a significant impact on the efficiency of the photovoltaic (PV) module. The cover glass of PV-modules constitutes a large part of the total weight of the unit. In a recent Solar-ERA.NET project, LIMES (www.limes.nu), have we been aiming towards developing 1 mm thin glass for PV modules by improving the indentation mechanical properties and by investigating a novel thermo-chemical strengthening method.

    Starting from traditional soda-lime-silicate float composition different components was studied in a DoE fashion. The mechanical properties were studied using nano- and microindentation, the chemical durability by P98 analysis and weathering experiments. The findings resulted in a suggested composition for improving the properties of float glass by adding small amounts of zinc and titanium oxide as well as increasing the amount of aluminum and magnesium oxide. The components found to improve the chemical resistance were alumina, zirconia, zinc, lanthanum and titanium oxide. The surface hardness, crack- and scratch resistance were improved when magnesia was replaced with zinc oxide. When magnesia was replaced with titania, the hardness was increased.

    Some results from the thermo-chemical strengthening experiments will be presented. Heating and quenching in a reactive gas atmosphere using aluminum precursors have resulted in chemically modified surface in addition to the thermal strengthening.

  • 12.
    Grund Bäck, Lina
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för byggd miljö och energiteknik (BET)..
    Sharafat, Ali
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för byggd miljö och energiteknik (BET)..
    Karlsson, Stefan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, Glafo Glasforskningsinstitutet. Friedrich Schiller University of Jena, Otto Schott Institute of Materials Research.
    Wondraczek, Lothar
    Friedrich Schiller University of Jena, Otto Schott Institute of Materials Research.
    Jonson, Bo
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för byggd miljö och energiteknik (BET)..
    X-ray and UV-Vis-NIR absorption spectroscopy studies of the Cu(I) and Cu(II) coordination spheere in (mixed) alkali-lime-silicate glassesManuskript (preprint) (Annet vitenskapelig)
  • 13.
    Johansson, Pernilla
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Brander, Linus
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, CBI Betonginstitutet.
    Jansson, Anna
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Kemi och material.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Landel, Pierre
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Svennberg, Kaisa
    Kvalitet hos byggnadsmaterial i cirkulära flöden2017Rapport (Annet vitenskapelig)
    Abstract [sv]

    Denna rapport är en del av ett projekt med det övergripande målet att bygg- och rivningsavfall i högre utsträckning skall återvinnas eller återanvändas. Detta utan att kvaliteten på materialet, och därmed framtida byggnader, försämras.

    Syftet med projektet har varit att kartlägga och sammanställa de kunskaper och erfarenheter som finns kring de tekniska aspekterna vid cirkulära flöden av byggmaterial, med fokus på kvalitetsfrågor, att identifiera nya projekt som kan minska mängden bygg- och rivningsavfall som deponeras eller förbränns samt att skapa nya nätverk. Det finns spridd kunskap i byggbranschen om dessa frågor och dessutom finns en mängd forskningsresultat inom olika områden. I projektet har kunskaper och erfarenheter inom området samlats in genom litteraturstudier, workshops och seminarier, studiebesök och intervjuer.

    I första delen av rapporten diskuteras generella tekniska erfarenheter och utmaningar i olika delar av byggkedjan, medan utmaningar för specifika materialgrupper diskuteras i den andra delen av rapporten. Dessa materialgrupper är polymera material, planglas, stenull, glasull, gipsskivor, krossad betong samt trä och träbaserade material. I rapporten redovisas en enkätundersökning som genomförts av Optimera hos deras proffskunder, i syfte att samla in dessas erfarenheter och synpunkter kring hållbart byggande.

    Generellt kan vi konstatera att det finns stora utmaningar med att öka återvinningsgraden för rivnings- och ombyggnadsavfall. För installationsspill och byggavfall är de tekniska utmaningarna inte lika stora. Utmaningar och förutsättningar för ökad återvinning med bibehållen god kvalitet varierar mellan olika materialslag/produkter, typ av byggprojekt samt avsedd användning.

    I rapporten föreslås ett antal konkreta förslag på områden där arbetet kan drivas vidare. Dessa inkluderar bland annat förbättrad/utökad inventering inför rivning och ombyggnad, rutiner och metoder för provtagning, korrekt sortering, hantering och lagring för att få rätt och jämn kvalitet, ge möjlighet för separering av sammansatta material, logistikfrågor, produktionstekniska lösningar samt kvalitetssäkring. Resultaten visar också på vikten av utbildning, nätverk och mötesplatser samt att forskningsprojekt genomförs tvärvetenskapligt. Det finns goda möjligheter för ökad återvinning genom samarbete genom hela byggkedjan.

    Fulltekst (pdf)
    fulltext
  • 14.
    Johansson, Wilhelm
    et al.
    Linnaeus University, Sweden.
    Peralta, Albert
    KTH Royal Institute of Technology, Sweden.
    Jonson, Bo
    Linnaus University, Sweden.
    Anand, Srinivasan
    KTH Royal Institute of Technology, Sweden.
    Österlund, Lars
    Uppsala University, Sweden.
    Karlsson, Stefan
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Transparent TiO2 and ZnO Thin Films on Glass for UV Protection of PV Modules2020Inngår i: American Ceramic Society Bulletin, ISSN 0002-7812, E-ISSN 1945-2705, Vol. 99, nr 4, s. 26-29Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
    Abstract [en]

    Failure of photovoltaic modules frequently occurs as a result of degradation of their encapsulation material by destructive UV radiation. Transparent TiO2 and ZnO thin films could protect against these harmful wavelengths.

    Fulltekst (pdf)
    fulltext
  • 15.
    Johansson, Wilhelm
    et al.
    Linnaeus University, Sweden.
    Peralta, Albert
    KTH Royal Institute of Technology, Sweden.
    Jonson, Bo
    Linnaeus University, Sweden.
    Anand, Srinivasan
    KTH Royal Institute of Technology, Sweden.
    Österlund, Lars
    Uppsala University, Sweden.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Transparent TiO2 and ZnO Thin Films on Glass for UV Protection of PV Modules2019Inngår i: Frontiers in Materials, E-ISSN 2296-8016, Vol. 6, artikkel-id 259Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Failure of PV modules frequently occurs as a result of degradation of their encapsulation material by destructive UV radiation. Both the life expectancy and efficiency of PV modules can be improved by reducing the transmittance of the destructive UV radiation through the cover glass without compromising the transmittance in the visible wavelength region. In addition, if the absorbed UV photons can be down-shifted to wavelengths that can be more efficiently converted to electrical energy, an additional increase of the PV efficiency could be achieved. In this study we have investigated transparent ZnO and TiO2 thin films deposited by spray pyrolysis on soda lime silicate float glass as functional layers on PV cover glass. The optical bandgap, UV-cutoff, UV-Vis transmittance, reflectivity (total and diffuse) and photoluminescence have been determined. The ZnO coating shifted the optical bandgap to longer wavelengths, resulting in a reduction of the transmittance of destructive UV radiation by up to ~85%. Distinct photoluminescence peaks at 377 nm and at 640 nm were observed for one of the ZnO samples. The TiO2 coated glasses also showed an increased UV cutoff, which resulted in a reduction of transmittance of destructive UV radiation by up to 75%. However, no photoluminescence peaks could be observed from the TiO2 films with 325 nm excitation laser, which can be explained by the fact that only indirect interband transitions are accessible at this excitation wavelength. Deposition of both ZnO and TiO2 coatings resulted in a reduction of the transmitted light convertible by PV modules, by up to 12.3 and 21.8%, respectively. The implication of the results is discussed in terms of lifetime expectancy and efficiency of PV modules.

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  • 16.
    Järn, Mikael
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Kemi och material.
    Grund Bäck, Lina
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Andersson, Anne
    RISE - Research Institutes of Sweden (2017-2019), Säkerhet och transport, Mätteknik.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Mesoporous sol-gel based SiO2 thin films with ordered pore orientation as antireflective coatings on glass2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Antireflective coatings on glass have increasing applications, on e.g. cover glass of PV modules, display glass, spectacle lenses or window glazing’s. Sol-gel derived mesoporous coatings can be tuned both in terms of porosity and thickness, thus allowing tuning of the refractive index. Additionally, the sol-gel approach is bottom-up, which facilitates easy upscaling. In the current work we present dip-coated mesoporous silica coatings of different pore orientation and film thickness prepared on microscope glass slides and silicon wafers. The silica coatings were derived from TEOS (tetraorthosilicates) mixed with ethanol and diluted HCl. Hexagonal and cubic pore ordering of the thin films with a pore size in the range of 5-10 nm were obtained. The thin films were characterized in terms of non-contact profilometry, stylus profilometry,  nanohardness, scratch resistance, UV-Vis-NIR transmittance and UV-Vis-NIR reflectance. The thicknesses of the studied films varied from 100 nm up to several hundreds of nm without jeopardizing the film homogeneity. All the mesoporous films exhibited higher transmittance than the uncoated glass substrate. The film with hexagonal pore orientation has a somewhat higher nanohardness than the cubic one, however,  no difference was found in the scratch resistance for the films with different pore orientations.

  • 17.
    Karlsson, Stefan
    RISE Research Institutes of Sweden, Samhällsbyggnad, Bygg och fastighet.
    Chemical strengthening of soda lime silicate glass and the effects of dopants2022Konferansepaper (Annet vitenskapelig)
  • 18.
    Karlsson, Stefan
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Compositional Effects on Indentation Mechanical Properties of Chemically Strengthened TiO2-Doped Soda Lime Silicate Glasses2022Inngår i: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 15, nr 2, artikkel-id 577Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    TiO2 is an important oxide for property modifications in the conventional soda lime silicate glass family. It offers interesting optical and mechanical properties, for instance, by substituting heavy metals such as lead in consumer glasses. The compositional effects on the hardness, reduced elastic modulus and crack resistance as determined by indentation of chemically strengthened (CS) TiO2-doped soda lime silicate glass was studied in the current paper. The CS, which was performed by a K+ for Na+ ion exchange in a molten KNO3 salt bath at 450 °C for 15 h, yielded significant changes in the indentation mechanical properties. The hardness of the glass samples increased, and this was notably dependent on the SiO2, CaO and TiO2 content. The reduced elastic modulus was less affected by the CS but showed decrease for most samples. The crack resistance, an important property in many applications where glasses are subjected to contact damage, showed very different behaviors among the series. Only one of the series did significantly improve the crack resistance where low CaO content, high TiO2 content, high molar volume and increased elastic deformation favored an increased crack resistance.

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    Supplementary material
  • 19.
    Karlsson, Stefan
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Corrigendum to “Viscosity of alumina doped soda lime silicate glasses – observation of anomaly in the linear increase as Al2O3 replaces SiO2” [Journal of Non-Crystalline Solids Vol 573 (2021) start 121149]2024Inngår i: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 627, s. 122828-122828, artikkel-id 122828Artikkel i tidsskrift (Annet vitenskapelig)
    Fulltekst (pdf)
    fulltext
  • 20.
    Karlsson, Stefan
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Corrigendum to “Viscosity of alumina doped soda lime silicate glasses – observation of anomaly in the linear increase as Al2O3 replaces SiO2” [Journal of Non-Crystalline Solids Vol 573 (2021) start 121149]2024Inngår i: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 627, s. 122828-122828, artikkel-id 122828Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    The authors regret publication of Fig. 1 in [1], that clearly do not show the rheometer setup, it should be replaced with the following Fig. 1.

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  • 21.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Dataset: Indentation mechanical properties of chemically strengthened TiO2 doped soda lime silicate glass2022Dataset
    Abstract [en]

    Titanium oxide has been added to the conventional soda lime silicate composition that is the most used glass in different applications. Surface mechanical properties through indentation using both nano- and micro-indenter has been studied both before and after chemical strengthening of the different glass samples.

  • 22.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Dataset: The viscosity effect of TiO2 on soda-lime-silicate bearing glass2021Dataset
  • 23.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Dataset: Viscosity of alumina doped soda lime silicate glasses2021Dataset
    Abstract [en]

    Adding alumina to the conventional soda lime silicate glass composition improves many properties, however, also increases the viscosity. Alumina doping of soda lime silicate glasses is investigated and its implications to high temperature viscosity as SiO2 is replaced by Al2O3.

  • 24.
    Karlsson, Stefan
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Effects on indentation mechanical properties by chemically strengthening of TiO2 and Al2O3 doped soda lime silicate glasses2022Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Soda lime silicate is an important industrial glass type, it is used in, e.g., windows, containers, household glasses, displays, cover glasses and in automotive glazing. The importance of soda lime silicate glass originates from the forming ability that enables low-cost manufacturing but also relatively high hardness, good chemical durability, and the essential transparency in the visible range. However, soda lime silicate glass suffers from brittleness and has a relatively low resistance towards surface defects. Therefore, is the practical strength of commercially available glass in the soda lime silicate glass family limited. The mechanical properties of glass is of great importance in various applications. Chemical strengthening (CS) of glass has become a successful process that today is used in many applications. It makes glass stronger by exchanging larger ions from a molten salt bath with smaller ions from the glass and thereby inducing compressive stresses in the surface. However, soda lime silicate glass is typically not well-suited for this process and therefore has the effect of dopants on surface mechanical properties as result of CS been studied. Hardness, reduced elastic modulus and crack resistance were studied. The CS was performed in a molten KNO3 salt bath at 450 °C. The results will be discussed in relation to the compositional and structural changes.

  • 25.
    Karlsson, Stefan
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Functional cover glass materials for solar energy applications2023Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Glass materials are essential in everyone’s life by enabling daylight to reach the interior of our buildings,being the primary component for communication via optical fibers and a key component in electronic devices as protective cover and/or dielectric material. It is also an essential component in solar energy applications which comprise, e.g., photovoltaics , solar thermal collectors, greenhouses and algae reactors, by acting as a protective and light transmitting barrier. Adding functionalities to glass in an intelligent way creates opportunities to enhance the properties of the glass material for its use. There are several possibilities to add functionalities and the wider concept Transparent Intelligence will be briefly introduced and how it can aid our efforts to overcome today’s societal challenges. Glass as a cover material for solar energy applications constitutes a significant part of the costs and isan important component for efficient light capture and protection to the environment. The research and development of cover glass for solar energy applications have so far received limited attention eventhough it is an important material for our future sustainable development. Recent research efforts have provided knowledge of which properties that needs to be optimized ‐ balancing efficiency, service lifetime and cost. The challenges of cover glass for different solar energy applications differs somewhat but all have in common the efficient solar light capture and protection to the environment. Thus, theknow‐how can be used in several different industrial sectors. The fundamentals of cover glasses for solarenergy applications as well as previous and on‐going project concepts will be presented. This includes i) state‐of‐the‐art of cover materials for greenhouses, ii) results on optimization of cover glass for photovoltaics, iii) initial results on how to provide both anti‐reflective and anti‐soiling properties,iv) results on broadband antireflective coatings for solar thermal energy, and v) other promising concepts. At last will some future challenges and needs be discussed, e.g., in relation to the concept ofideal material choices for PV.

  • 26.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Kartläggning av svenska aktörer relevanta för utvecklandet av funktionaliteter hos smarta fönster: Appendix till förstudie för Smart Windows Technology Center (SWTC)2017Rapport (Annet (populærvitenskap, debatt, mm))
  • 27.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Möjligheter och begränsningar med färgade solceller2019Inngår i: GLAS, nr 2, s. 30-32Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
    Abstract [sv]

    Solceller har länge varit ett lovande alternativ förelproduktion men har hittills begränsats av kostnad och effektivitet. Förstörre installationer har man för några år sedan kunnat nå samma pris som fördet rörliga elpriset och sedan 2002 har solcellsinstallationerna fördubblats för varje år som gått.

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  • 28.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Nya innovationer bäddar för tunnare och starkare glas i solceller, fönster och fasader2017Inngår i: Glas, nr 3, s. 26-30Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
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  • 29.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Spontaneous Fracture in Thermally Strengthened Glass - A Review and Outlook2017Inngår i: Ceramics-Silikáty, ISSN 0862-5468, E-ISSN 1804-5847, Vol. 61, nr 3, s. 188-201Artikkel, forskningsoversikt (Fagfellevurdert)
    Abstract [en]

    Thermal strengthening of glass is common for many different purposes including architecture, automotive, glasses for solar energy, tableware and occasionally also containers. It is an easy and relatively cheap method to make glasses stronger, however, with an Achilles heel that it can spontaneously fracture without the slightest applied external force. Though, fracture due to applied external force is the most common case, spontaneous fracture is rare. The current paper reviews the literature of spontaneous fracture and NiS inclusions and what kind of mitigation measures that have been done in order to reduce the frequency of spontaneous fracture. Finally is also an outlook for the alternative mitigation measures and their advantages as well as disadvantages. A personal perspective is given in discussions and gives an outlook to the most promising alternative methods to reduce and hopefully eliminate the NiS inclusions. These include multi-functional methods where not only the NiS inclusion issue is solved. 

    Fulltekst (pdf)
    Spontaneous Fracture in Thermally Strengthened Glass - A Review and Outlook
  • 30.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Spontangranulering: Akilleshälen för termiskt härdat glas2017Inngår i: Glas, nr 4, s. 54-56Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
    Abstract [sv]

    Alla somhar läst Homeros epos Iliaden känner till Akilles, den grekiska mytologinsstörste hjälte som dessvärre hade en sårbar punkt, akilleshälen. Termiskthärdat glas är nästintill en perfekt produkt där man får både ett starkare glasoch ett betydligt säkrare glas genom den karaktäristiska sprickbildningen somger kantiga glasbitar som inte är så vassa och som ofta kallas granuler

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  • 31.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    The future development of cover glass for efficient harvesting of solar energy (INVITED)2019Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Glass as a cover material for solar energy harvesting constitutes a significant part of the cost. Furthermore, is glass an important component for efficient light capture and protection to the environment. Research and development of cover glass is needed to increase the service lifetime and to reduce the cost per watt peak. Recent research efforts have provided knowledge of which properties that needs to be optimized balancing efficiency, service lifetime and cost. Challenges with the development of cover glass for efficient harvesting of solar energy will be discussed. Some recent results related to optimization of the glass composition for enhancing properties for the purpose and the deposition of functional thin films will be presented. The failure modes for PV modules and how glass can improve the resistance to failure will be discussed. Developments of transparent and robust multifunctional coatings that provide anti-reflective and anti-soiling properties on the outer glass surface are desired. On the interior surface are anti-reflective and chemical barrier multifunctional coatings desirable to increase transmission and reducing potential induced degradation (PID). Replacing the conventional silver strings in PV modules with transparent conductive materials and back-reflecting backsheet materials are among the promising techniques for further maximizing the efficiency.

  • 32.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    The viscosity effect of TiO2 on soda-lime-silicate bearing glass2019Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The effect of TiO2 on the high-temperature viscosity of soda-lime-silicate glass have been investigated. The silica-rich part of quaternary can be taken as a template for a wide variety of technical glasses. The measurements were performed using a rotational viscometer. The viscosities were recorded from 1550 °C downwards to 930 °C. The entire viscosity-temperature curves were fitted to the Angell-Rao viscosity equation and thermodynamic data were calculated using the method of Ojovan and the liquid fragility according to Angell. As TiO2 is replacing SiO2 it has a slight suppressing effect on the viscosity until the limit when Na2O/TiO2 ratio is less than 2, indicating a transformation of the structure of TiO2, a remarkable increase in the fragility and viscosity is observed for the calculated low temperature region. The change is not as evident for the high-temperature region. CaO replaced by TiO2 gives almost no effect on the viscosity, however, as it approaches Na2O/TiO2≈2 it tends to crystallize at temperatures of 1000-1050 °C.

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  • 33.
    Karlsson, Stefan
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Towards practically stronger glass – recent advances and outlook2023Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Theoretically is glass one of the strongest materials. However, due to surface defects inevitably formed during manufacturing, transport, handling and use of glass, the practical strength is greatly limited by stress-concentrations at crack tips under tension. Glass has limited fracture toughness which gives a practical strength that spans over several orders of magnitude. Despite this is glass used in a wide range of applications, where architectural and automotive are among the most apparent applications for the general public. The unreliable strength requires an unnecessary thick glass and this has a direct consequence on the sustainability fingerprint. The recent advances and an outlook on improving the practical strength of glass are presented including the improvement of surface quality, improving mechanical properties, and strengthening of glass together with a concept of non-destructive testing (NDT) of the glass strength. NDT of glass is a game-changer that, among other things, enables quality-sorting in the glass industry.

  • 34.
    Karlsson, Stefan
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Tunnare och starkare glas: Från historia till framtid2023Inngår i: GLAS, nr 4, s. 34-35Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
    Abstract [sv]

    Glas är ett material med många tilltalande egenskaper vilket har medfört att det har ett stort antal användningsområden. Trots detta har materialet studerats förhållandevis lite och nu behövs en ny generation forskare som utmanar egenskaperna. Exempelvis den att glaset i vissa applikationer kan vara sprött och medföra att ”skadat” glas kan gå sönder vid liten belastning, något de flesta människor förmodligen upplevt någon gång. Ett faktum som till viss del begränsar tillämpningen och gör att glas har behövt vara ”onödigt” tjockt. Starkare och tåligare glas är och förblir därför ett viktigt forskningsområde.

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  • 35.
    Karlsson, Stefan
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Viscosity of alumina doped soda lime silicate glasses – observation of anomaly in the linear increase as Al2O3 replaces SiO22021Inngår i: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 573, artikkel-id 121149Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Adding alumina to the conventional soda lime silicate glass composition improves many properties, however, also increases the melting temperature. In the current paper, alumina doping of soda lime silicate glasses and its implications to high temperature viscosity are investigated in order to verify the linearity when replacing SiO2 for Al2O3. An anomaly in the linearly increasing viscosity was found when the ratio CaO/Al2O3 is <1, which is explained by Ca2+ acting as an inhibitor for viscous flow. The Angell and Rao and the Waterton-MYEGA models show very similar results, even for the extrapolated Tg. Thermodynamic data extracted using the Ojovan method generally increases linearly with the Al2O3 content. The Doremus fragility index shows a deviation in the linearity while the Angell fragility index on the other hand shows a linear increase with the Al2O3 content.

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    Supplementary material
  • 36.
    Karlsson, Stefan
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, Glafo Glasforskningsinstitutet.
    Ali, Sharafat
    Linnaeus University, Sweden.
    Strand, Michael
    Linnaeus University, Sweden.
    Chemical strengthening of flat glass by vapour deposition and in-line alkali metal ion exchange2014Rapport (Annet vitenskapelig)
    Abstract [en]

    Glass is a common material in the everyday life. It is widely used in a variety ofapplications e.g. architectural, automotive, containers, drinking vessels, displays,insulation and optical fibers due to its universal forming ability, transparency, chemicaldurability, form stability, hardness and relatively low price. Flat glass is a wide market ofthe glass industry and generally ninety percent of all flat glass produced worldwide ismanufactured using the float forming process. There is a large market strive for thinnerand stronger glass in order to reduce costs, save energy, reduce environmental footprint,find new applications and to improve the working environment for labour working withmounting flat glass.

    This study comprises the modification of flat/float glass surface by a novel route;exchange of ionic species originating from in-line vapour deposition of salt compared tothe conventional route of immersing the glass in molten salt baths. The aim of this workis to develop a novel process in order to improve the mechanical strength of flat/floatglass by introducing external material to the surface in a process with the obviouspotential to be automatic in industrial processes. Chemical strengthening has beenperformed by applying potassium chloride to the glass surface by vapour deposition andthermally activated ion exchange. The method presented here is anticipated to be used inproduction in the future and would make it possible to produce larger quantities ofchemically strengthened flat glass to a considerably lower cost.

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  • 37.
    Karlsson, Stefan
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Andersson, S
    Acoustic Agree AB, Sweden.
    Grund Bäck, Lina
    Haller, KCE
    Acoustic Agree AB, Sweden.
    Kozlowski, M
    Silesian University of Technology, Poland.
    Persson, K
    Lund University, Sweden.
    Non-destructive testing of the glass strength in flat glass with indentationinduced cracks by Nonlinear Acoustic Wave method2022Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Glass is a unique but unfortunately brittle material whose strength is primarily limited by the presenceof cracks on the surface [1]. The strength of glass is limited by the fact that very high stresses arise atthe crack tips when subjected to tensile load. In principle, without the presence of surface cracks, glasswould have a strength far exceeding many other structural materials, e.g., steel. The size and thedistribution of surface cracks vary greatly, which results in the strength of glass exhibit a great variationand thus requires that large safety margins must be applied for glass in practical applications, e.g., whenused as a load bearing building material.Today, there are no methods to determine the strength of flat glass non-destructively. Instead, thestrength is determined by different experimental methods requiring >10 samples for sufficient statistics.This procedure requires both lots of glassy materials and time. The future aim is to investigate if the useof nonlinear acoustic waves (NAW) could be an alternative for developing a standardized designstrength value. Developing a non-destructive inspection method for determining the glass strength is ascientific breakthrough that will have a great industrial impact for the sustainable development of glassmanufacturing.With the use of NAW it is possible to detect and quantify the defects in materials [2,3]. The nonlinearwaves are transmitted through the object and the nonlinear effects, caused by the defects in thematerial, corresponds to the level of damage in the material. This work present result from samplescontaining relatively precise defects. The defects were created using a microindenter with a sufficientload to cause indentation induced cracking in the glass. The indentations were created using a Vickersdiamond tip in the middle of commercial 4 mm float glass samples of the dimensions 10x10 cm2. Theapplied loads were 0.5N, 1N, 2N, 5N and 10N. The “damage value” of the sample series was thenquantified using the NAW technique. The fracture strength of the samples was correlated destructivelyusing a conventional ring-on-ring setup.The results show that there is a clear correlation between the indenter load, the damage value from theNAW inspection and the fracture strength. We noted that the standard deviation for the ring-on-ringtests for the 1N, 2N, 5N and 10N was low while the 0.5N and the reference samples presented a highstandard deviation. A possible explanation for this observation is that for 0.5N not all indents give radialcracks but in some cases the indentation produces only plastic deformation. The main conclusion fromthe research is that is possible to detect realistically large defects in glass using the non-destructive NAWmethod and these defects cannot be seen with the naked eye. Moreover, the results can be directlycorrelated with the strength of glass [4].

    References[1] Veer, F.A. and Y.M. Rodichev, The structural strength of glass: hidden damage. Strength of Materials, 2011.43(3): p. 302-315. DOI: 10.1007/s11223-011-9298-5.[2] Persson, K., K. Haller, S. Karlsson, and M. Kozłowski, Non-destructive testing of the strength of glass by a nonlinearultrasonic method. Challenging Glass Conference Proceedings, 2020. 7. DOI: 10.7480/cgc.7.4498.[3] Haller, K., Doctoral Thesis: Acoustical measurements of material nonlinearity and nonequilibrium recovery.2008: Department of Mechanical Engineering, Blekinge Institute of Technology.[4] Karlsson, S., L. Grund Bäck, S. Andersson, K. Haller, M. Kozłowski, and K. Persson, Strength classification of flatglass for better quality – validation of method by well-defined surface defects and strength testing, in ÅForskReport,19-479. 2021: http://dx.doi.org/10.13140/RG.2.2.32992.40962.

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  • 38.
    Karlsson, Stefan
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Bingham, Paul A.
    Sheffield Hallam University, UK.
    Advances and Challenges of Cover Glasses for Efficient Harvesting of Solar Electricity2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Harvesting of solar energy through photovoltaic (PV) modules is an essential technology for increasing the share of renewable energy sources, both immediately and in the future. The glass cover material constitutes a significant part of the cost. Research and development of the cover glass is needed to increase the service lifetime and to reduce the cost per watt peak [1]. Recent research efforts in the LIMES project show that the addition of optically active components absorb harmful UV light and simultaneously convert those UV photons into visible light [2]. Thus, the profit is two-fold, increasing both service lifetime and efficiency by up to 4%. Further, the cover glass composition can be optimized to enhance the mechanical and chemical durability. It has been shown that it is possible to increase the indentation crack resistance [2] and the hydrolytic durability by three and four times respectively by modifying the glass composition. Thermal strengthening of glass for PV modules are required for mechanical durability. However, there is an increasing demand of light-weight PV modules, therefor is thermal strengthening of thin cover glass needed to meet the increasing demand. In-situ chemical vapour deposition (CVD) of Al2O3 and thermal strengthening of the cover glass provides an additionally crack resistant and chemically durable glass surface. Developments of transparent and robust multifunctional coatings that provide anti-reflective and self-cleaning properties on the outer glass surface are desired [4]. Thereby is maximal transmission and reduced soiling achieved. On the interior surface are anti-reflective and chemical barrier multifunctional coatings desirable to increase transmission and reducing potential induced degradation (PID) [5]. The LIMES concept has been demonstrated by quantitative measurements and as Si solar cells. The scale-up of the LIMES concept and additional material challenges to increase the efficiency and service lifetime will be discussed. Replacing the conventional silver strings in PV modules with transparent conductive tape and back-reflecting backsheet materials are among the promising techniques for further maximizing the efficiency.

    Fulltekst (pdf)
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  • 39.
    Karlsson, Stefan
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Eklund, Per
    Linköping University, Sweden.
    Österlund, Lars
    Uppsala University, Sweden.
    Birch, Jens
    Linköping University, Sweden.
    Ali, Sharafat
    Linnæus University, Sweden.
    Effects of deposition temperature on the mechanical and structural properties of amorphous Al-Si-O thin films prepared by radio frequency magnetron sputtering2023Inngår i: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 787, artikkel-id 140135Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Aluminosilicate (Al–Si–O) thin films containing up to 31 at.% Al and 23 at.% Si were prepared by reactive RF magnetron co-sputtering. Mechanical and structural properties were measured by indentation and specular reflectance infrared spectroscopy at varying Si sputtering target power and substrate temperature in the range 100 to 500 °C. It was found that an increased substrate temperature and Al/Si ratio give denser structure and consequently higher hardness (7.4 to 9.5 GPa) and higher reduced elastic modulus (85 to 93 GPa) while at the same time lower crack resistance (2.6 to 0.9 N). The intensity of the infrared Si-O-Si/Al asymmetric stretching vibrations shows a linear dependence with respect to Al concentration. The Al–O–Al vibrational band (at 1050 cm−1) shifts towards higher wavenumbers with increasing Al concentration which indicates a decrease of the bond length, evidencing denser structure and higher residual stress, which is supported by the increased hardness. The same Al–O–Al vibrational band (at 1050 cm−1) shifts towards lower wavenumber with increasing substrate temperature indicating an increase in the average coordination number of Al.

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    fulltext
  • 40.
    Karlsson, Stefan
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Grund Bäck, Lina
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Andersson, Anne
    RISE - Research Institutes of Sweden (2017-2019), Säkerhet och transport, Mätteknik.
    Sundberg, Peter
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Lundstedt, Karin
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Sehati, Parisa
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Stålhandske, Christina
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Lätta Innovativa Material för Effektiva Solcellsmoduler (LIMES)2017Rapport (Annet vitenskapelig)
    Abstract [sv]

    Utvinning av solenergi genom solceller är en lovande teknik för att öka andelen förnyelsebara energikällor både nu och i framtiden. Glas till solceller är en betydande del av kostnaden och en nödvändighet att utveckla för att öka livslängden och minska priset per utvunnen watt. I LIMES har man studerat dels att tillsätta optiskt aktiva komponenter som absorberar skadligt UV ljus och samtidigt konverterar det till synligt ljus som i sin tur kan konverteras till energi i solcellerna. Därmed är vinsten tvåfaldig, ökar både livslängden och effektiviteten med upp till 4%. Vidare har det studerats hur man kan optimera de mekaniska och kemiska egenskaperna av glas för att kunna öka den mekaniska och kemiska livslängden, detta genom att optimera glassammansättningen. Man har inom projektet visat att motstånd mot sprickbildning av en ny sammansättning ökar med en faktor 3 och att den kemiska resistensen ökar med en faktor 4. Termo-kemisk härdning av glas har demonstrerats i labskala som ger upphov till minst lika stor härdningsgrad samt ökar motstånd mot sprickbildning med en faktor 2. Det möjliggör användning av tunnare glas och därmed betydligt lättare solceller. Glasytans sammansättning modifieras signifikant genom att öka halten aluminiumoxid och det ger upphov till de förbättrade egenskaperna. Den termo-kemiska behandlingen ökar vattens kontaktvinkel mot glasytan vilket bidrar till ett självrengörande glas. Multifunktionella ytor på glas som är både antireflektiva och självrengörande har studerats genom två olika angreppssätt, nanostrukturerad ytmodifiering och porösa antireflektiva beläggningar med fotokatalytisk nedbrytningsförmåga. Nanostrukturerade glasytor ger upphov till en ökad ljusspridning och kan på så vis effektivt guida ner diffust ljus till solceller och samtidigt ändra vattens kontaktvinkel mot glaset. LIMES-koncepten har demonstrerats genom kvantitativa mätningar och tillverkande av små kiselsolcellsmoduler. Projektet har stått för att öka potentialen för kommersialisering ifrån TRL (Technology Readiness Level) nivå 2-4 till 4-6. Man undersöker i det närmaste hur man kan skala upp planglastillverkning för att kunna ta nästa steg mot kommersialisering.

    Fulltekst (pdf)
    Slutrapport LIMES
  • 41.
    Karlsson, Stefan
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Grund Bäck, Lina
    RISE Research Institutes of Sweden, Samhällsbyggnad, Bygg och fastighet.
    Andersson, Sara
    Acoustic Agree, Sweden.
    Haller, Kristian
    Acoustic Agree, Sweden.
    Kozłowski, Marcin
    Lund University, Sweden.
    Persson, Kent
    Lund University, Sweden.
    Strength classification of flat glass for better quality – validation of method by well-defined surface defects and strength testing2021Rapport (Annet vitenskapelig)
    Abstract [en]

    The current project was a collaborative project between the involved partners: RISE Glass, Lund University and Acoustic Agree. It is funded by ÅForsk (Grant No. 19-479). The project is a follow-up project from a Smart Housing Småland (Grant No. 2016-04218) pre-study where we used a nonlinear acoustic wave (NAW) to determine the damage value in float glass simultaneously with four-point bending tests. Glass is a brittle material whose strength is primarily determined by its surface characteristics i.e., the presence of flaws, defects or cracks on the surface. The strength of glass is greatly limited by stress-concentrations at the crack tips generating very high stresses when the glass is under load. The size and distribution of surface defects vary greatly, this gives a great variation of strength of glasses so that conventionally very large safety measures must be employed for glass products. If these defects and/or cracks could be detected in a non-destructive way, it would be beneficial for glass manufacturers as well as final building users. Nonlinear acoustic wave (NAW) techniques can be used to detect defects in materials. In these methods, acoustic waves are transmitted through an object and nonlinear effects, caused by the defects in the material, is analysed from the signal obtained at the receiver. The aim of the current project was to establish a calibration and a clear correlation between nonlinear acoustic wave measurements and the ultimate strength of annealed glass samples with controlled defects. Controlled defects were made as indentation imprints with a microindenter, equipped with a Vickers diamond head, in the middle of float glass samples with the dimensions 4×100×100 mm3. The applied loads were 0.5N, 1N, 2N, 5N and 10N. The indents were inspected with a microscope in order to see the cracks and the depth of the indents were also determined. The formed defects (cracks) were detected with NAW technique. Analysing the waves after propagating in the glass the nonlinear content in the wave was analysed. Due to the objects damage, the propagated wave distorts proportionally to the damage. After the NAW-inspection the strength of the glass samples were tested with ring-on-ring tests. Using the results from NAW-inspection, a clear correlation between the nonlinear response and the indenter load was found. There was also an obvious correlation between the failure load on the ring-on-ring-tests and the indenter load. The standard deviation for the ring-on-ring-tests for the 1N, 2N, 5N and 10 N was low but for the 0.5 N load was very high. A possible explanation is that the indenter imprint in most of the cases only gave rise to plastic deformation and in some samples, cracks were formed too. There were visible cracks for all the higher indenter loads and thus a lower scatter of the results. The main conclusion of the project is that it is possible to detect small cracks, which cannot be seen with the naked eye, with NAW technique and it can be directly correlated to the strength of the glass.

    Fulltekst (pdf)
    fulltext
  • 42.
    Karlsson, Stefan
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, Glafo Glasforskningsinstitutet. University of Jena, Germany.
    Grund Bäck, Lina
    Linnaeus University, Sweden.
    Kidkhunthod, Pinit
    Synchrotron Light Research Institute, Thailand.
    Lundstedt, Karin
    RISE., SP – Sveriges Tekniska Forskningsinstitut, Glafo Glasforskningsinstitutet.
    Wondraczek, Lothar
    University of Jena, Germany.
    Effect of TiO2 on optical properties of glasses in the soda-lime-silicate system2016Inngår i: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 6, nr 4, s. 1198-1216Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Titania is widely considered as an alternative constituent for replacing heavy metal oxides in optical glasses. Its effect on optical properties, however, is complex. This is due to the dielectric properties of the prevalent ionic species, Ti4+, the potential co-existence of trivalent titanium, Ti3+, giving rise to intrinsic and extrinsic charge transfer reactions, and the existence of different coordination polyhedra, depending on matrix composition. Here, we present a systematic study of the optical properties of the soda-lime-silicate glass system as a function of TiO2 addition. We consider the silica-rich region of the SiO2-Na2O-CaO-TiO2 quaternary, which may be taken as model for a variety of technical glasses. Trends are described in the refractive index, the Abbe number, the optical bandgap and the Urbach energy. The addition of TiO2 increases the refractive index and the optical dispersion while it lowers the optical bandgap and the Urbach Energy. Results are discussed in relation to relevant literature data towards using titania silicate glasses as high-index replacements for heavy metal – containing oxide glasses.

    Fulltekst (pdf)
    fulltext
  • 43.
    Karlsson, Stefan
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, Glafo Glasforskningsinstitutet. Linnaeus University, Sweden.
    Jonson, Bo
    Linnaeus University, Sweden.
    Johansson, Marie
    Linnaeus University, Sweden.
    Enquist, Bertil
    Linnaeus University, Sweden.
    The effect of single-side ion exchange on the flexural strength of plain float glass and float glass containing a drilled hole2013Inngår i: Glass Technology, ISSN 0017-1050, Vol. 54, nr 2, s. 66-71Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The effect of single-side ion exchange (using a KNO3:KCl mixture) on the ring-on-ring flexural strength of float glass has been studied. Two ion exchanged series, treated at 450 and 515°C, were investigated. The ion exchanged samples showed approximately 160 respectively 100% increases in their arithmetic mean strength compared to as-received float glass. Furthermore, a series of samples containing drilled holes were studied in order to investigate the effect of singleside ion exchange on such common construction elements. The samples that contained drilled holes were ion exchanged at 450°C and showed around 140% increase of the fracture load compared to the untreated samples containing drilled holes. As a general observation, the ion exchange treatment induced ∼110 MPa compressive stresses (515°C) and ∼180 MPa compressive stresses (450°C). The ion exchanged samples showed no significant increase in stiffness.

  • 44.
    Karlsson, Stefan
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, Glafo Glasforskningsinstitutet. Linnaeus University, Sweden.
    Jonson, Bo
    Linnaeus University, Sweden.
    Reibstein, Sindy
    Friedrich-Alexander University of Erlangen-Nuremberg, Germany; University of Jena, Germany.
    Wondraczek, Lothar
    Friedrich-Alexander University of Erlangen-Nuremberg, Germany; University of Jena, Germany.
    Surface ruby colouring of float glass by sodium-copper ion exchange2013Inngår i: Glass Technology: European Journal of Glass Science and Technology Part A, ISSN 1753-3554, Vol. 54, nr 3, s. 100-107Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper, colouration of the tin side of commercial soda-lime-silica float glass by copper ion exchange is described and characterised. Data on the resulting concentration versus depth profiles, absorbance versus depth profiles, UV-Vis spectra and CIE-Lab colour coordinates are reported. Fundamental aspects of the process of colouration are described and discussed. Optimum saturation of the colour is achieved after ion exchange at 520°C for 10 h or at 500°C for 20 h. The depth of the coloured layer increases with increasing treatment time. At the same time, a linear dependency is found between the values of a and b in the CIE-Lab colour space for variations of treatment time and temperature. The later indicates broad tunability of colouration between different shades of ruby and varying colour saturation. It is shown that colour arises from a redox reaction between copper species and residual tin ions, and that the depth of the coloured layer is governed by the position of the tin hump. The critical concentration of tin and copper to achieve colour formation was found to be ∼0·25 mol% and >1 mol%, respectively.

  • 45.
    Karlsson, Stefan
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, Glafo Glasforskningsinstitutet. RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Jonson, Bo
    Stålhandske, Christina
    RISE., SP – Sveriges Tekniska Forskningsinstitut, Glafo Glasforskningsinstitutet.
    The technology of chemical glass strengthening: A review2010Inngår i: Glass Technology: European Journal of Glass Science and Technology Part A, ISSN 1753-3554, Vol. 51, nr 2, s. 41-54Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The methods of chemical strengthening for improving the mechanical properties of oxide glasses are reviewed. Chemical strengthening is compared with thermal strengthening and different methods of measuring strength are discussed. Different ions, salts and other related methods for improving the ion exchange process and mechanical properties are described as well as applications of strengthening.

  • 46.
    Karlsson, Stefan
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, Glafo Glasforskningsinstitutet.
    Jonson, Bo
    Sundberg, Peter
    RISE., SP – Sveriges Tekniska Forskningsinstitut, Glafo Glasforskningsinstitutet.
    Stålhandske, Christina
    RISE., SP – Sveriges Tekniska Forskningsinstitut, Glafo Glasforskningsinstitutet.
    Surface analysis of float glass using surface ablation cell (SAC).: Part 2. Determination of the diffusion characteristics of K+-Na+ ion exchange2010Inngår i: Glass Technology: European Journal of Glass Science and Technology Part A, ISSN 1753-3554, Vol. 51, nr 2, s. 55-62Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The surface ablation cell (SAC), a laboratory equipment for determining surface concentration profiles, has been utilised to characterise surface ion exchange processes in float glass. In this paper, single-side ion exchange is reported. Data on the ion concentration profiles were used to calculate diffusion coefficients as well as the activation energy for K +-Na+ ion exchange. The air-sides of float glass samples were treated with two different salt mixtures, (I) 2:1 KNO3:KCI, and (II) 1:2 KNO3:KCl, (both by weight), and heated to different temperatures below Tg, 460-520°C. The diffusion coefficients calculated using a Green's function approach were in the ranges (I) 1.4×10-11 to 6.8×10-11 and (II) 1.8×10-11 to 6.0×10-11 cm2/s while those calculated using Boltzmann-Matano were in the ranges (I) 5.7×10 -11 to 14×10-12 and (II) 3.4×10-12 to 6.0×10-12 cm2/s. Average values of the activation energies obtained through the Green's function were (I) 111.0 kJ/mol and (II) 99.8 kJ/mol for the different salt mixtures.

  • 47.
    Karlsson, Stefan
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Järn, Mikael
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Lindh, E Mattias
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Bioraffinaderi och energi.
    Nya ytbeläggningar ska minska snöförluster på solcellsanläggningar2023Inngår i: GLAS, nr 1, s. 34-37Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
    Abstract [sv]

    För att slippa vänta på plusgrader håller en samling forskare på RISE på attutveckla och testa nya ytbeläggningar för solceller som ska göra att snö och isinte fäster på dem. Snö och is kan leda till stopp i elproduktionen - en solcellsmodulsom är täckt av snö och is generar i praktiken ingen elektricitet eftersomsolljuset inte tränger igenom i tillräcklig omfattning. Dessutom kan rejälasnömängder leda till stora belastningar på underliggande konstruktioner.

    Fulltekst (pdf)
    fulltext
  • 48.
    Karlsson, Stefan
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik. RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Järn, Mikael
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Kemi och material.
    Welinder, Jan
    RISE - Research Institutes of Sweden (2017-2019), Säkerhet och transport, Elektronik.
    Andersson, Anne
    RISE - Research Institutes of Sweden (2017-2019), Säkerhet och transport, Mätteknik.
    Liinanki, Matilda
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Försth, Michael
    RISE - Research Institutes of Sweden (2017-2019), Säkerhet och transport, Safety.
    Transparent intelligens för en bättre värld - en sammanfattning av fyra år med TIME2017Inngår i: GLAS, nr 2, s. 58-59Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
    Fulltekst (pdf)
    fulltext
  • 49.
    Karlsson, Stefan
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Järn, Mikael
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Zäll, Erik
    Umeå University, Sweden.
    Antireflektiv beläggning i världsklass ger effektivare solfångare2023Inngår i: GLAS, nr 4, s. 36-37Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
    Abstract [sv]

    I ett nyligen avslutat forskningsprojekt har Absolicon Solar Collector tillsammans med RISE Research Institutes of Sweden och Umeå universitet utvecklat en ny toppmodern antireflektiv beläggning som kan göra Absolicons solfångare än mer effektiva. Nu siktar man på ett nytt projekt för att skala upp metoden.

    Fulltekst (pdf)
    fulltext
  • 50.
    Karlsson, Stefan
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Kalinowski, Mariusz
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, CBI Betonginstitutet.
    Lang, Maria
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Sehati, Parisa
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, Byggteknik.
    Järphag, Thomas
    NCC Building, Sweden.
    Storm, Oskar
    Saint-Gobain Building Glass Polska, Poland.
    Axelsson Thun, Anders
    Skanska Sverige, Sweden.
    Häll, Jörgen
    Glascentrum, Sweden.
    Korrosion av planglas inom byggbranschen kopplat till betong2019Rapport (Annet vitenskapelig)
    Abstract [sv]

    Ett förekommande problem under byggprocessen är betongrinning. Innebörden av betongrinning är att vatten varit i kontakt med färsk betong och därefter påverkat glasytor till fasader/balkonger/fönster. Påverkan på glaset kan vara fysisk och ibland även kemisk. Resultatet blir droppfläckar, rinnmärken och utfällningar som försämrar glasets ljusgenomsläpplighet och estetiska intryck. Så länge påverkan enbart är fysisk är denna skada relativt lätt att ta bort antingen med hjälp av mekanisk polering eller genom att torka glaset med utspädd syra. Ofta fortskrider dock processen till ett kemiskt angrepp på glaset, vilket är permanent och inte går att avlägsna helt med ovan nämnda metoder. Kemiska reaktioner har då skapat etsningar i glasytan som på sikt blir i storleksordningen mikrometer djupa.

    I denna förstudie har vi försökt simulera betongrinningsangrepp dels under kontrollerade förhållanden i laboratoriemiljö och dels i utomhusmiljö. Försöksvariablerna var två olika betongvarianter samt glas med respektive utan ett på marknaden befintligt glasskyddande medel. Resultatet av försöken har analyserats genom okulär bedömning, mikroanalys med svepelektronmikroskop och energidispersiv röntgenspektroskopi samt yttopografimätningar med optisk profilometer. Testerna resulterade i utfällningar på glasytan innehållande ämnena svavel, kalium och kalcium, vilka bedöms härstamma från betongen. Efter inomhusförsöken, som pågick i fyra månader, gick utfällningarna att tvätta bort med saltsyralösning, och inga djupgående, permanenta korrosionsskador syntes på glaset. Utomhusförsöken utsträcktes till elva månader, varpå bestående skador kunde konstateras på glasytorna efter att utfällningarna tvättats bort. Djupet på skadorna uppmättes som mest till cirka en halv mikrometer. Varken sänkning av pH i betongen eller skyddsbehandling av glaset bidrog till att hindra uppkomst av fläckighet eller etsningar på glaset. I diskussioner med industrirepresentanter konstaterades att betongrinning är ett ganska vanligt problem, som är oberoende av geografi. Tidigare försök med behandling av både betong och glas varit verkningslösa. I majoriteten av fall handlar problemen om inglasade balkonger alternativt glasräcken i kombination med balkongplatta i betong. Det man vet fungerar är att använda en korrekt konstruktion som hindrar vattnet från att droppa ned på glaset. Regelbunden rengöring av glasen hjälper också och kommer förmodligen hamna som ett underhållskrav mot kunder.

    Fulltekst (pdf)
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