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  • 1.
    Ahmadkhaniha, Donya
    et al.
    Jönköping University, Sweden.
    Leisner, Peter
    RISE - Research Institutes of Sweden, Säkerhet och transport, Elektronik. Jönköping University, Sweden.
    Zanella, Caterina
    Jönköping University, Sweden.
    Pinate, Santiago
    Jönköping University, Sweden.
    Electrodeposition of Ni high P composite coatings containing nano and submicron ceramic particles2017Konferensbidrag (Refereegranskat)
  • 2.
    Albinsson, Ola
    et al.
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Lundevall, Åsa
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Sehati, Parisa
    Linköpings universitet.
    Stålhanske, Christina
    RISE.
    Sundberg, P
    Mattsson, Lards-Göran
    KTH Royal Institute of Technology .
    Sjövall, Peter
    Rise.
    The influence of surface composition and plasma treatment on adhesion2015Ingår i: Proceedings of GPD Glass Performance Days 2015, 2015, s. 11-14Konferensbidrag (Övrigt vetenskapligt)
  • 3. Barbier, C.
    et al.
    Rättö, Peter
    RISE., Innventia.
    Hornatowska, Joanna
    RISE., Innventia.
    Coating models for an analysis of cracking behavior between folded paper and creased board2012Konferensbidrag (Refereegranskat)
  • 4.
    Belov, Ilia
    et al.
    Jönköping University, Sweden.
    Zanella, Caterina
    Jönköping University, Sweden.
    Edström, Curt
    Jönköping University, Sweden.
    Leisner, Peter
    RISE - Research Institutes of Sweden. Jönköping University, Sweden.
    Simulation based investigation of silver plating process parameters and their effect on throwing power2015Ingår i: EAST Forum 2015, 2015Konferensbidrag (Refereegranskat)
  • 5.
    Bolelli, G.
    et al.
    University of Modena and Reggio Emilia, Italy.
    Lyphout, Christophe
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Berger, L. -M
    Fraunhofer, Germany.
    Testa, V.
    University of Modena and Reggio Emilia, Italy.
    Myalska-Głowacka, H.
    Silesian University of Technology, Poland.
    Puddu, P.
    University of Modena and Reggio Emilia, Italy.
    Sassatelli, P.
    Il Sentiero International Campus Srl, Italy.
    Lusvarghi, L.
    University of Modena and Reggio Emilia, Italy.
    Wear resistance of HVOF- and HVAF-sprayed (Ti,Mo)(C,N)–Ni coatings from an agglomerated and sintered powder2023Ingår i: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 512-513, artikel-id 204550Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    (Ti,Mo)(C,N)-25 wt% Ni coatings obtained by spraying an agglomerated and sintered feedstock powder using different high velocity air-fuel (HVAF) and high velocity oxygen-fuel (HVOF) deposition processes are comparatively analysed for their sliding, abrasion and impact resistance. All HVOF-sprayed coatings are particularly dense, with ≈800 HV hardness (tested at 100 gf, 300 gf and 500 gf). In-flight oxidation resulted in some embrittlement, as revealed by scratch tests. In ball-on-disk sliding against an Al2O3 counterpart, they maintained a mild wear regime (wear rates ≤10−6 mm3/(N⋅m)) from room temperature up to 600 °C, with better performance in comparison to Cr3C2–NiCr reference coatings. At room temperature, the Ti(C,N) hard phase limited the abrasive cutting by counterbody asperities. At 400 °C and 600 °C, the coatings developed a thin, protective oxide tribofilm. They also exhibited no interface delamination in cyclic impact tests. However, they suffered higher wear (≈3–5 × 10−3 mm3/(N⋅m)) in high-stress particle abrasion testing, particularly when compared to HVAF-sprayed Cr3C2–NiCr. Gaining improved control over in-flight oxidation of (Ti,Mo)(C,N)–Ni during spraying is probably the key to overcome this limitation. The HVAF-sprayed (Ti,Mo)(C,N)–Ni coating exhibited severe interlamellar decohesion under all test conditions, as the limited melting degree of the feedstock did not compensate for the intrinsic microstructural inhomogeneity of the powder particles. 

  • 6.
    Capanema, Ewellyn
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Bioekonomi.
    Balakshin, Mikhail
    BOKU, Austria.
    Application of Omno polymers in PF wood adhesives2017Ingår i: 19th International symposium on wood, fibre and pulping chemistry, August 28 - September 1, 2017, Porto Seguro, Brazil, 2017, s. 65-69Konferensbidrag (Refereegranskat)
    Abstract [en]

    The Plantrose® technology is a promising biorefinery method which enables the production of C5 and C6 sugars from different lignocellulosics using sub- and supercritical water in a two-step process. The lignin rich solids after carbohydrate hydrolysis containing various amounts of residual cellulose are trademarked as OmnoTM polymers. The reactivity and bonding performance of different Omno polymers in direct partial substitution of phenol-formaldehyde adhesive resins (PF) for the manufacture of oriented strand board (OSB) and softwood plywood were evaluated by a fast bench screening test using the Automatic Bond Evaluation System (ABES) and by pilot trials on the production and testing of wood panels. The results showed that about 1/3 of commercial glues could be successfully substituted by Omno polymers without any significant drop in the adhesive reactivity and properties of the resulting wood panels. Selected Omno polymers had superior performance as compared to high-purity pulping lignins (Kraft, soda and organosolv) due to a positive effect of the residual cellulose in the Omnopolymers on the adhesive performance. Hardwood lignins had no disadvantages as compared to various softwood lignins, in strict contrast to the current dogma.

  • 7.
    Charlène, Reverdy
    et al.
    CNRS, France; Grenoble Institute of Technology, France.
    Sedighi Moghaddam, Maziar
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Sundin, Mikael
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik. RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Swerin, Agne
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Julien, Bras
    CNRS, France; Grenoble Institute of Technology, France.
    Superhydrophobic surfaces manufacturing with nanocellulose2016Ingår i: N.I.C.E. 2016 - The 3rd International Conference on Bioinspired and Biobased Chemistry & Materials, 2016Konferensbidrag (Refereegranskat)
    Abstract [en]

    Researchers in natural fibers see opportunities in superhydrophobicity for fabrics or paper. The first challenge with natural fiber is their high hydrophilicity when the second is the perpetual search for water born coating  in papermaking. These challenges were overcome by a one pot formulation comprising a latex binder, precipitated calcium carbonate and  fatty acids to give their hydrophobicity to pigments 1.  In this study, we want to go further by replacing the petro-sourced latex with a new kind of fibers that are cellulose nanofibers (CNF).

    Inspired by the Lotus leaf, superhydrophobic surfaces have been a center of interest in the last decade because of their high potential in industry for a variety of applications.  It is seen as the next generation of surface for anti-fouling and corrosive retardant in navy industry but also  in general  anti corrosive materials industry.  Now widely studied , mechanisms for manufacturing superhydrophobicity are well understood. Born from the alliance of low surface energy chemistry and physical structuration of surface, superhydrophobic materials give a water contact angle above 150° and a slidding angle below 10°.

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    Poster
  • 8.
    Ejenstam, Lina
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Polymer och fiber. KTH Royal Institute of Technology, Sweden.
    Swerin, Agne
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik. KTH Royal Institute of Technology, Sweden.
    Claesson, Per M.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik. KTH Royal Institute of Technology, Sweden.
    Toward superhydrophobic polydimethylsiloxane−silica particle coatings2016Ingår i: Journal of Dispersion Science and Technology, ISSN 0193-2691, E-ISSN 1532-2351, Vol. 37, nr 9, s. 1375-1383Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Hydrophobized silica nanoparticles of different sizes, from 16 to 500 nm, were used to impart roughness to a hydrophobic polydimethylsiloxane (PDMS) coating with the aim of obtaining superhydrophobic properties. The particle silanization process and the curing process of the PDMS coating were optimized to increase the contact angle (CA) of the particle containing coating. The evaluation of the coatings, by means of water CA measurements and scanning electron microscopy imaging, shows that superhydrophobicity in the adhesive rose state was achieved using combinations of two differently sized particles, with an excess of the small 16 nm ones. Superhydrophobicity in the lotus state was obtained when the filler concentration of 16 nm particles was 40 wt%, but under such conditions the coating was found to partially crack, which is detrimental in barrier applications. The preference for the rose wetting state can be explained by the round shape of the particles, which promotes the superhydrophobic rose wetting state over that of the superhydrophobic lotus state.

  • 9.
    Ejenstam, Lina
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Polymer och fiber. KTH Royal Institute of Technology, Sweden.
    Swerin, Agne
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik. KTH Royal Institute of Technology, Sweden.
    Pan, Jinshan
    KTH Royal Institute of Technology, Sweden.
    Claesson, Per M.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik. KTH Royal Institute of Technology, Sweden.
    Corrosion protection by hydrophobic silica particle-polydimethylsiloxane composite coatings2015Ingår i: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 99, s. 89-97Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this study, the time-dependent corrosion protection ability of 10-15. μm thin polydimethylsiloxane-nanoparticle composite coatings was evaluated using mainly open circuit potential and electrochemical impedance spectroscopy measurements. The best result was obtained for the coating containing 20. wt% hydrophobic silica nanoparticles, where it was possible to achieve protection for almost 80 days in 3. wt% NaCl solution. The protective properties offered by this coating are suggested to be due to a synergistic effect of the hydrophobicity of the polydimethylsiloxane matrix and the prolonged diffusion path caused by addition of hydrophobic silica particles.

  • 10.
    Ejenstam, Lina
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Polymer och fiber. KTH Royal Institute of Technology, Sweden.
    Tuominen, Mikko
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Haapanen, Janne
    Tampere University of Technology, Finland.
    Mäkelä, Jyrki M.
    Tampere University of Technology, Finland.
    Pan, Jinshan
    KTH Royal Institute of Technology, Sweden.
    Swerin, Agne
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik. KTH Royal Institute of Technology, Sweden.
    Claesson, Per M.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik. KTH Royal Institute of Technology, Sweden.
    Long-term corrosion protection by a thin nano-composite coating2015Ingår i: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 357, nr Part B, s. 2333-2342Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We report and discuss the corrosion protective properties of a thin nano-composite coating system consisting of an 11μm thick polyester acrylate (PEA) basecoat, covered by an approximately 1-2μm thick layer of TiO2 nanoparticles carrying a 0.05μm thick hexamethyl disiloxane (HMDSO) top coat. The corrosion protective properties were evaluated on carbon steel substrates immersed in 3wt% NaCl solution by open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) measurements. The protective properties of each layer, and of each pair of layers, were also evaluated to gain further understanding of the long-term protective properties offered by the nano-composite coating. The full coating system showed excellent corrosion protective properties in the corrosive environment of 3wt% NaCl-solution for an extended period of 100 days, during which the coating impedance, at the lower frequency limit (0.01Hz), remained above 108 Ωcm2. We suggest that the excellent corrosion protective properties of the complete coating system is due to a combination of (i) good adhesion and stability of the PEA basecoat, (ii) the surface roughness and the elongated diffusion path provided by the addition of TiO2 nanoparticles, and (iii) the low surface energy provided by the HMDSO top coat.

  • 11.
    Ferraris, M.
    et al.
    Politecnico di Torino, Italy.
    Perero, S.
    Politecnico di Torino, Italy.
    Ferraris, S.
    Politecnico di Torino, Italy.
    Miola, M.
    Politecnico di Torino, Italy.
    Vernè, E.
    Politecnico di Torino, Italy.
    Skoglund, S.
    KTH Royal Institute of Technology, Sweden.
    Blomberg, Eva
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Kemi och material. KTH Royal Institute of Technology, Sweden.
    Odnevall Wallinder, I.
    KTH Royal Institute of Technology, Sweden.
    Antibacterial silver nanocluster/silica composite coatings on stainless steel2017Ingår i: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 396, s. 1546-1555Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A coating made of silver nanocluster/silica composites has been deposited, via a radio frequency (RF) co-sputtering technique, for the first time onto stainless steel (AISI 304L) with the aim to improve its antibacterial properties. Different thermal treatments after coating deposition have been applied in order to optimize the coating adhesion, cohesion and its antibacterial properties. Its applicability has been investigated at realistic conditions in a cheese production plant. The physico-chemical characteristics of the coatings have been analyzed by means of different bulk and surface analytical techniques. Field emission scanning electron microscopy (FESEM), X-ray Photoelectron Spectroscopy (XPS), contact angle measurements and atomic force microscopy (AFM) were employed to assess coating morphology, composition, surface roughness, wetting properties, size and local distribution of the nanoparticles within the coating. Tape tests were used to determine the adhesion/cohesion properties of the coating. The amount and time-dependence of released silver in solutions of acetic acid, artificial water, artificial tap water and artificial milk were determined by means of Atomic Absorption Spectroscopy (AAS). The antibacterial effect of the coating was evaluated at different experimental conditions using a standard bacterial strain of Staphylococcus aureus in compliance with National Committee for Clinical Laboratory Standards (NCCLS) and AATCC 147 standards. The Ahearn test was performed to measure the adhesion of bacteria to the coated stainless steel surface compared with a control surface. The antibacterial coating retained its antibacterial activity after thermal treatment up to 450 °C and after soaking in common cleaning products for stainless steel surfaces used for e.g. food applications. The antibacterial capacity of the coating remained at high levels for 1-5 days, and showed a good capacity to reduce the adhesion of bacteria up to 30 days. Only a few percent of silver in the coating was released into acetic acid, even after 10 days of exposure at 40 °C. Most silver (> 90%) remained also in the coating even after 240 h of continuous exposure. Similar observations were made after repeated exposure at 100 °C. Very low levels of released silver in solution were observed in artificial milk. No release of silver nanoparticles was observed either in synthetic tap water or in artificial milk at given conditions. The coating further displayed good antibacterial properties also when tested during working conditions in a cheese production plant.

  • 12.
    Gopaluni, Aditya
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Lyckfeldt, Ola
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Hatami, Sepehr
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Powder Spreadability in Metal Additive Manufacturing2019Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Powder spreadability is a key factor for ensuring a robust manufacturing with metal powder bed fusion (PBF) technologies such as selective laser melting (SLM) and electron beam melting (EBM). In these technologies, the powder melts upon the impact of the laser or electron beam and, subsequently solidifies and densifies as it cools. Therefore, being able to consistently spread even powder layers with a high packing density is essential for complete melting and densification without local variations. However, so far it has been difficult to predict the spreadability of a powder with traditional methods such as Hall flowmeter or by modern techniques such as powder rheology or dynamic avalanche analysis. In this study, the spreadability of several gas atomized tool steel powders with different particle size distribution (PSD) have been evaluated in a newly developed equipment which mimics the spreading technique and layer thickness control of a commercial SLM system. The powder packing density as a function of re-coater speed and layer thickness was determined under process-like conditions. Topographic variations of the powder layer were characterized by Confocal microscopy combined with Focus Variation. In general, the results show that independent of powder properties in terms of PSD or flow properties, the re-coater speed has the most significant impact on powder packing density. In this study, the speed was varied between 100-200 mm/s and the results show that higher packing density can be achieved at lower speeds. This finding was confirmed by the topographic examination of the layer. In addition, the tests clearly reveal that broader PSD improves the packing density whereas layer thickness in the range of 30 to 120 µm has a minor effect with only a slight increase in packing density with increased layer thickness. The newly developed test equipment with its features, testing procedures, powder spreading results and initial correlation to SLM trials will be presented. It is foreseen that with further development in terms of automatization and integration of topographic evaluation tools, this test equipment can serve as a powerful tool for standardization and prediction of powder performance in all metal PBF processes.

  • 13.
    Groth, Cecilia
    RISE - Research Institutes of Sweden, Swerea.
    ECOSUS - ekologiskt hållbara förbehandlingar för lackering av multimetall2017Konferensbidrag (Övrigt vetenskapligt)
  • 14.
    Groth, Cecilia
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB.
    Förbehandling före pulverlackering2015Konferensbidrag (Övrigt vetenskapligt)
  • 15.
    Götelid, Sareh
    et al.
    Swerim AB, Sweden.
    Ma, Taoran
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Lyphout, Christophe
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Vang, Jesper
    Swerim AB, Sweden.
    Stålnacke, Emil
    Swerim AB, Sweden.
    Holmberg, Jonas
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Hosseini, Seyed
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Strondl, Annika
    Swerim AB, Sweden.
    Effect of post-processing on microstructure and mechanical properties of Alloy 718 fabricated using powder bed fusion additive manufacturing processes2021Ingår i: Rapid prototyping journal, ISSN 1355-2546, E-ISSN 1758-7670, Vol. 27, nr 9, s. 1617-1632Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Purpose: This study aims to investigate additive manufacturing of nickel-based superalloy IN718 made by powder bed fusion processes: powder bed fusion laser beam (PBF-LB) and powder bed fusion electron beam (PBF-EB). Design/methodology/approach: This work has focused on the influence of building methods and post-fabrication processes on the final part properties, including microstructure, surface quality, residual stresses and mechanical properties. Findings: PBF-LB produced a much smoother surface. Blasting and shot peening (SP) reduced the roughness even more but did not affect the PBF-EB surface finish as much. As-printed PBF-EB parts have low residual stresses in all directions, whereas it was much higher for PBF-LB. However, heat treatment removed the stresses and SP created compressive stresses for samples from both PBF processes. The standard Arcam process parameter for PBF-EB for IN718 is not fully optimized, which leads to porosity and inferior mechanical properties. However, impact toughness after hot isostatic pressing was surprisingly high. Originality/value: The two processes gave different results and also responses to post-treatments, which could be of advantage or disadvantage for different applications. Suggestions for improving the properties of parts produced by each method are presented.

  • 16.
    Hanif, Imran
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Bioraffinaderi och energi. Chalmers University of Technology, Sweden.
    Ssenteza, Vicent
    Chalmers University of Technology, Sweden.
    Eklund, Johan
    Chalmers University of Technology, Sweden.
    Nockert Olovsjö, Johanna
    Kanthal AB, Sweden.
    Jonsson, Torbjörn
    Chalmers University of Technology, Sweden.
    High-temperature corrosion of weld overlay coating/bulk FeCrAl exposed in O2 + H2O + KCl(s) at 600 °C – A microstructural investigation2023Ingår i: Journal of Materials Research and Technology, ISSN 2238-7854, Vol. 25, s. 7008-7023Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This work investigates the impact of high-temperature corrosion behavior of the newly developed FeCrAl alloy Kanthal® EF101 bulk material and weld overlay coating in the presence of KCl(g)/KCl(s) at 600 °C. The oxide scale formed within the secondary corrosion regime after exposure and the impact of alloy microstructure on corrosion behavior was investigated using scanning transmission electron microscopy. The findings indicated the key microstructural differences is the alloy grain size which influences the formation of a protective scale. In addition, It is indicated that coating exhibited inferior performance than the bulk material, primarily attributed to the microstructural differences. © 2023 The Author(s)

  • 17.
    Hatami, Sepehr
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Variation of fatigue strength of parts manufactured by laser powder bed fusion2022Ingår i: Powder Metallurgy, ISSN 0032-5899, E-ISSN 1743-2901, Vol. 65, nr 3, s. 258-264Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study reports the variability of the fatigue strength of specimens manufactured by the laser powder bed fusion process with respect to their location on the build plate. Specimens from the right-hand and left-hand halves of the build plate were tested under high cycle fatigue. Comparison of the fatigue data suggests that the specimens manufactured on the right-hand half of the build plate have a higher fatigue strength than those manufactured on the left-hand half. One reason for the observed discrepancy in fatigue strength was the higher accumulation of spattered powder particles on the left-hand side as compared to the right-hand side of the build plate. These spattered particles are oxidised, and form defects such as inclusions within the specimen. © 2021 The Author(s)

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  • 18.
    Heydari, Golrokh
    et al.
    KTH Royal Institute of Technology, Sweden.
    Sedighi Moghaddam, Maziar
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik. KTH Royal Institute of Technology, Sweden.
    Tuominen, Mikko
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Fielden, Matthew
    KTH Royal Institute of Technology, Sweden.
    Haapanen, Janne
    TUT Tampere University of Technology, Finland.
    Mäkelä, Jyrki M.
    TUT Tampere University of Technology, Finland.
    Claesson, Per M.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik. KTH Royal Institute of Technology, Sweden.
    Wetting hysteresis induced by temperature changes: Supercooled water on hydrophobic surfaces2016Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 468, s. 21-33Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The state and stability of supercooled water on (super)hydrophobic surfaces is crucial for low temperature applications and it will affect anti-icing and de-icing properties. Surface characteristics such as topography and chemistry are expected to affect wetting hysteresis during temperature cycling experiments, and also the freezing delay of supercooled water. We utilized stochastically rough wood surfaces that were further modified to render them hydrophobic or superhydrophobic. Liquid flame spraying (LFS) was utilized to create a multi-scale roughness by depositing titanium dioxide nanoparticles. The coating was subsequently made non-polar by applying a thin plasma polymer layer. As flat reference samples modified silica surfaces with similar chemistries were utilized. With these substrates we test the hypothesis that superhydrophobic surfaces also should retard ice formation. Wetting hysteresis was evaluated using contact angle measurements during a freeze-thaw cycle from room temperature to freezing occurrence at -7 °C, and then back to room temperature. Further, the delay in freezing of supercooled water droplets was studied at temperatures of -4 °C and -7 °C. The hysteresis in contact angle observed during a cooling-heating cycle is found to be small on flat hydrophobic surfaces. However, significant changes in contact angles during a cooling-heating cycle are observed on the rough surfaces, with a higher contact angle observed on cooling compared to during the subsequent heating. Condensation and subsequent frost formation at sub-zero temperatures induce the hysteresis. The freezing delay data show that the flat surface is more efficient in enhancing the freezing delay than the rougher surfaces, which can be rationalized considering heterogeneous nucleation theory. Thus, our data suggests that molecular flat surfaces, rather than rough superhydrophobic surfaces, are beneficial for retarding ice formation under conditions that allow condensation and frost formation to occur.

  • 19.
    Holmberg, Jonas
    RISE Research Institutes of Sweden, Sweden.
    Surface integrity on post processed alloy 718 after nonconventional machining2018Licentiatavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    There is a strong industrial driving force to find alternative production technologies in order to make the production of aero engine components of superalloys even more efficient than it is today. Introducing new and nonconventional machining technologies allows taking a giant leap to increase the material removal rate and thereby drastically increase the productivity. However, the end result is to meet the requirements set for today's machined surfaces.The present work has been dedicated to improving the knowledge of how the non-conventional machining methods Abrasive Water Jet Machining, AWJM, Laser Beam Machining, LBM, and Electrical Discharge Machining, EDM, affect the surface integrity. The aim has been to understand how the surface integrity could be altered to an acceptable level. The results of this work have shown that both EDM and AWJM are two possible candidates but EDM is the better alternative; mainly due to the method's ability to machine complex geometries. It has further been shown that both methods require post processing in order to clean the surface and to improve the topography and for the case of EDM ageneration of compressive residual stresses are also needed.Three cold working post processes have been evaluated in order to attain this: shot peening, grit blasting and high pressure water jet cleaning, HPWJC. There sults showed that a combination of two post processes is required in order to reach the specified level of surface integrity in terms of cleaning and generating compressive residual stresses and low surface roughness. The method of high pressure water jet cleaning was the most effective method for removing the EDM wire residuals, and shot peening generated the highest compressive residual stresses as well as improved the surface topography.To summarise: the most promising production flow alternative using nonconventional machining would be EDM followed by post processing using HPWJC and shot peening.

  • 20.
    Holmberg, Jonas
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Berglund, Johan
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Brohede, Ulrika
    Swerim AB, Sweden.
    Åkerfeldt, Pia
    Luleå university of Technolgy, Sweden.
    Sandell, Viktor
    Luleå university of Technology, Sweden.
    Rashid, Amir
    KTH Royal institute of Technology, Sweden.
    Zhao, Xiaoyu
    KTH Royal institute of Technology, Sweden.
    Dadbakhsh, Sasan
    KTH Royal institute of Technology, Sweden.
    Fischer, Marie
    Chalmers university of Technology, Sweden.
    Hryha, Eduard
    Chalmers university of Technology, Sweden.
    Wiklund, Urban
    Uppsala university, Sweden.
    Hassila, Carl Johan Karlsson
    Uppsala university, Sweden.
    Hosseini, Seyed
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Machining of additively manufactured alloy 718 in as-built and heat-treated condition: surface integrity and cutting tool wear2023Ingår i: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 130, nr 3-4, s. 1823-1842Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Additive manufacturing (AM) using powder bed fusion is becoming a mature technology that offers great possibilities and design freedom for manufacturing of near net shape components. However, for many gas turbine and aerospace applications, machining is still required, which motivates further research on the machinability and work piece integrity of additive-manufactured superalloys. In this work, turning tests have been performed on components made with both Powder Bed Fusion for Laser Beam (PBF-LB) and Electron Beam (PBF-EB) in as-built and heat-treated conditions. The two AM processes and the respective heat-treatments have generated different microstructural features that have a great impact on both the tool wear and the work piece surface integrity. The results show that the PBF-EB components have relatively lower geometrical accuracy, a rough surface topography, a coarse microstructure with hard precipitates and low residual stresses after printing. Turning of the PBF-EB material results in high cutting tool wear, which induces moderate tensile surface stresses that are balanced by deep compressive stresses and a superficial deformed surface that is greater for the heat-treated material. In comparison, the PBF-LB components have a higher geometrical accuracy, a relatively smooth topography and a fine microstructure, but with high tensile stresses after printing. Machining of PBF-LB material resulted in higher tool wear for the heat-treated material, increase of 49%, and significantly higher tensile surface stresses followed by shallower compressive stresses below the surface compared to the PBF-EB materials, but with no superficially deformed surface. It is further observed an 87% higher tool wear for PBF-EB in as-built condition and 43% in the heat-treated condition compared to the PBF-LB material. These results show that the selection of cutting tools and cutting settings are critical, which requires the development of suitable machining parameters that are designed for the microstructure of the material.

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  • 21.
    Holmberg, Jonas
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Hammersberg, Peter
    Chalmers University of Technology, Sweden.
    Lundin, Per
    Lundin Stress Service AB, Sweden.
    Olavison, Jari
    Volvo Group Trucks Operations, Sweden.
    Predictive Modeling of Induction-Hardened Depth Based on the Barkhausen Noise Signal2023Ingår i: Micromachines, E-ISSN 2072-666X, Vol. 14, nr 1Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A non-destructive verification method was explored in this work using the Barkhausen noise (BN) method for induction hardening depth measurements. The motive was to investigate the correlation between the hardness depth, microstructure, and the Barkhausen noise signal for an induction hardening process. Steel samples of grade C45 were induction-hardened to generate different hardness depths. Two sets of samples were produced in two different induction hardening equipment for generating the model and verification. The produced samples were evaluated by BN measurements followed by destructive verification of the material properties. The results show great potential for the several BN parameters, especially the magnetic voltage sweep slope signal, which has strong correlation with the hardening depth to depth of 4.5 mm. These results were further used to develop a multivariate predictive model to assess the hardness depth to 7 mm, which was validated on an additional dataset that was holdout from the model training.

  • 22.
    Holmberg, Jonas
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Wretland, Anders
    GKN Aerospace Engine Systems AB, Sweden.
    Berglund, Johan
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Abrasive Water Jet Milling as An Efficient Manufacturing Method for Superalloy Gas Turbine Components2022Ingår i: Journal of Manufacturing and Materials Processing, ISSN 2504-4494, Vol. 6, nr 5, artikel-id 124Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In order to improve efficiency when manufacturing gas turbine components, alternative machining techniques need to be explored. In this work, abrasive water jet (AWJ) machining by milling has been investigated as an alternative to traditional milling. Various test campaigns have been conducted to show different aspects of using AWJ milling for the machining of superalloys, such as alloy 718. The test campaigns span from studies of individual AWJ-milled tracks, multi-pass tracks, and the machining of larger components and features with complex geometry. In regard to material removal rates, these studies show that AWJ milling is able to compete with traditional semi/finish milling but may not reach as high an MRR as rough milling when machining in alloy 718. However, AWJ milling requires post-processing which decreases the total MRR. It has been shown that a strong advantage with AWJ milling is to manufacture difficult geometries such as narrow radii, holes, or sharp transitions with kept material removal rates and low impact on the surface integrity of the cut surface. Additionally, abrasive water jet machining (AWJM) offers a range of machining possibilities as it can alter between cutting through and milling. The surface integrity of the AWJM surface is also advantageous as it introduces compressive residual stress but may require post-processing to meet similar surface roughness levels as traditional milling and to remove unwanted AWJM particles from the machined surface. © 2022 by the authors.

  • 23.
    Holmberg, Jonas
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Wretland, Anders
    GKN Aerospace Sweden AB, Sweden.
    Berglund, Johan
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Beno, Tomas
    University West, Sweden.
    Karlsson, Anton
    Tooltec Trestad AB, Sweden.
    Surface integrity investigation to determine rough milling effects for assessment of machining allowance for subsequent finish milling of alloy 7182021Ingår i: Journal of Manufacturing and Materials Processing, ISSN 2504-4494, Vol. 5, nr 2, artikel-id 48Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The planned material volume to be removed from a blank to create the final shape of a part is commonly referred to as allowance. Determination of machining allowance is essential and has a great impact on productivity. The objective of the present work is to use a case study to investigate how a prior rough milling operation affects the finish machined surface and, after that, to use this knowledge to design a methodology for how to assess the machining allowance for subsequent milling operations based on residual stresses. Subsequent milling operations were performed to study the final surface integrity across a milled slot. This was done by rough ceramic milling followed by finish milling in seven subsequent steps. The results show that the up-, centre and down-milling induce different stresses and impact depths. Employing the developed methodology, the depth where the directional influence of the milling process diminishes has been shown to be a suitable minimum limit for the allowance. At this depth, the plastic flow causing severe deformation is not present anymore. It was shown that the centre of the milled slot has the deepest impact depth of 500 µm, up-milling caused an intermediate impact depth of 400 µm followed by down milling with an impact depth of 300 µm. With merged envelope profiles, it was shown that the effects from rough ceramic milling are gone after 3 finish milling passes, with a total depth of cut of 150 µm. © 2021 by the authors. 

  • 24.
    Hosseini, Seyed
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser. Chalmers University of Technology, Sweden.
    Mallipeddi, D.
    Chalmers University of Technology, Sweden.
    Holmberg, Jonas
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Rännar, L. -E
    Mid Sweden University, Sweden.
    Koptyug, A.
    Mid Sweden University, Sweden.
    Sjöström, W.
    Mid Sweden University, Sweden.
    Krajnik, P.
    Chalmers University of Technology, Sweden.
    Klement, U.
    Chalmers University of Technology, Sweden.
    Comparison of machining performance of stainless steel 316L produced by selective laser melting and electron beam melting2022Ingår i: Procedia CIRP, Elsevier B.V. , 2022, s. 72-77Konferensbidrag (Refereegranskat)
    Abstract [en]

    Powder bed fusion processes based additively manufactured SS 316L components fall short of surface integrity requirements needed for optimal functional performance. Hence, machining is required to achieve dimensional accuracy and to enhance surface integrity characteristics. This research is focused on comparing the material removal performance of 316L produced by PBF-LB (laser) and PBF-EB (electron beam) in terms of tool wear and surface integrity. The results showed comparable surface topography and residual stress profiles. While the hardness profiles revealed work hardening at the surface where PBF-LB specimens being more susceptible to work hardening. The investigation also revealed differences in the progress of the tool wear when machining specimens produced with either PBF-LB or PBF-EB. .

  • 25.
    Johansson, Kenth S.
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Kemi och material.
    20 - Surface Modification of Plastics2017Ingår i: Applied Plastics Engineering Handbook (Second Edition): Processing, Materials, and Applications / [ed] Kutz, Myer, Elsevier, 2017, s. 443-487Kapitel i bok, del av antologi (Övrigt vetenskapligt)
    Abstract [en]

    Abstract This chapter gives an overview of different methods for improving surface properties of plastics. Plastics are inherently hydrophobic, low surface energy materials and thus do not adhere well to other materials. Adhesion improvement is the most common application but other surface characteristics, such as wettability, water- and chemical resistance, nonfouling, tribological behavior, oxygen, and moisture transmission are also addressed. It has been estimated that 70% of the total production of plastic materials must be surface treated prior to processing. The methods range from vacuum to atmospheric pressure, wet to dry, simple to sophisticated, and inexpensive to very costly to obtain the required functional characteristics of plastics. Most methods used today are dry and environmentally sound. The methods presented are roughly divided in surface activation (e.g., plasma, corona, flame, and UV laser) and surface coating (e.g., plasma polymerization, chemical vapor deposition, Parylene, physical vapor deposition) techniques.

  • 26.
    Karlsson Hagnell, Mathilda
    et al.
    KTH Royal Institute of Technology, Sweden.
    Khurshid, Mansoor
    Cargotec Sweden AB, Sweden; KTH Royal Institute of Technology, Sweden.
    Åkermo, Malin
    KTH Royal Institute of Technology, Sweden.
    Barsoum, Zuheir
    KTH Royal Institute of Technology, Sweden.
    Design implications and opportunities of considering fatigue strength, manufacturing variations and predictive lcc in welds2021Ingår i: Metals, ISSN 2075-4701, Vol. 11, nr 10, artikel-id 1527Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Fatigue strength dictates life and cost of welded structures and is often a direct result of initial manufacturing variations and defects. This paper addresses this coupling through proposing and applying the methodology of predictive life-cycle costing (PLCC) to evaluate a welded structure exhibiting manufacturing-induced variations in penetration depth. It is found that if a full-width crack is a fact, a 50% thicker design can result in life-cycle cost reductions of 60% due to reduced repair costs. The paper demonstrates the importance of incorporating manufacturing variations in an early design stage to ensure an overall minimized life-cycle cost. © 2021 by the authors. 

  • 27. Koivula, H.
    et al.
    Kamal Alm, H.
    RISE., Innventia.
    Toivakka, M.
    Temperature and moisture effects on wetting of calcite surfaces by offset ink constituents2011Ingår i: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, nr 3, s. 105-111Artikel i tidskrift (Refereegranskat)
  • 28.
    Kokkirala, Sahith
    et al.
    Chalmers University of Technology, Sweden.
    Holmberg, Jonas
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Klement, Uta
    Chalmers University of Technology, Sweden.
    Lundström, Roger
    AB SKF, Sweden.
    Iwasaki, H
    SUMITOMO ELECTRIC Hartmetall GmbH, Germany.
    Hosseini, Seyed
    Chalmers University of Technology, Sweden.
    Effect of cutting parameters on the generated surface integrity of hard-turned martensitic AISI 52100 bearing steel2022Ingår i: Procedia CIRP, Elsevier B.V. , 2022, s. 154-159Konferensbidrag (Refereegranskat)
    Abstract [en]

    Hard turning offers improved manufacturing efficiency but requires great control of the cutting process to achieve the required machining-induced surface integrity with respect to residual stresses, surface topography, and near-surface microstructure. This research work is focused on studying the effect of the cutting speed, feed rate, depth of cut, chamfer angle, and coolant pressure on the surface integrity after hard turning of martensitic AISI 52100 steel. The results showed that the feed rate had a significant influence on the residual stresses and the surface topography. The discontinuous mechanically induced white layer was observed at high cutting speed and high chamfer angle with increased thickness. 

  • 29.
    Leisner, Peter
    RISE - Research Institutes of Sweden.
    About the effect of anodic pulses and periodiccurrent reversion on electrodeposits2012Konferensbidrag (Refereegranskat)
  • 30.
    Leisner, Peter
    RISE - Research Institutes of Sweden, Säkerhet och transport, Elektronik.
    Aspectsto be considered when making innovation out of promising research results insurface technology2018Konferensbidrag (Övrigt vetenskapligt)
  • 31.
    Leisner, Peter
    RISE - Research Institutes of Sweden, Säkerhet och transport, Elektronik. Jönköping University, Sweden.
    EAST Prizes for excellence in surface technology2017Ingår i: Transactions of the IMF / The international journal of surface engineering and coatings, Vol. 95, nr 4, s. 183-184Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 32.
    Leisner, Peter
    RISE - Research Institutes of Sweden. Jönköping university.
    Electrolytic methods for manufacturing of miniaturized structures2015Konferensbidrag (Övrigt vetenskapligt)
  • 33.
    Leisner, Peter
    RISE - Research Institutes of Sweden, Säkerhet och transport, Elektronik. Jönköping University, Sweden.
    Examination of coatings and interfaces by CTX-ray2016Ingår i: Surface Characterization Conference 2016, 2016Konferensbidrag (Övrigt vetenskapligt)
  • 34.
    Leisner, Peter
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Elektronik.
    Hansen, Åsa
    Jönköping University, Sweden.
    Zanella, Caterina
    Jönköping University, Sweden.
    Applicationof Assaf panel for evaluating the throwing power of pulse reverse plating2018Konferensbidrag (Övrigt vetenskapligt)
  • 35.
    Leisner, Peter
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Elektronik. Jönköping University, Sweden.
    Zanella, Caterina
    Jönköping University, Sweden.
    Introduction to pulse plating2016Ingår i: The 7th European Pulse Plating Seminar, 2016Konferensbidrag (Refereegranskat)
  • 36.
    Leisner, Peter
    et al.
    RISE - Research Institutes of Sweden. Jönköping University, Sweden.
    Zanella, Caterina
    Jönköping University, Sweden.
    Structure modification and process control by pulsed electrodeposition2015Ingår i: EUROMAT 2015, 2015Konferensbidrag (Refereegranskat)
  • 37.
    Leisner, Peter
    et al.
    RISE - Research Institutes of Sweden. Jönköping University, Sweden.
    Zanella, Caterina
    Jönköping University, Sweden.
    Belov, Ilia
    Jönköping University, Sweden.
    Edström, Curt
    RISE - Research Institutes of Sweden.
    Sandulache, Gabriela
    Happy Plating GmbH, Austria.
    Influence of pulse reverse plating parameters on throwing power in a silver cyanide bath2016Ingår i: The 7th European Pulse Plating Seminar, 2016Konferensbidrag (Övrigt vetenskapligt)
  • 38.
    Li, Hua
    et al.
    University of Newcastle, Australia.
    Somers, Anthony E.
    Deakin University, Australia.
    Rutland, Mark W.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Life Science. KTH Royal Institute of Technology, Sweden.
    Howlett, Patrick C.
    Deakin University, Australia.
    Atkin, Rob
    University of Newcastle, Australia.
    Combined nano- and macrotribology studies of titania lubrication using the oil-ionic liquid mixtures2016Ingår i: ACS Sustainable Chemistry and Engineering, E-ISSN 2168-0485, Vol. 4, nr 9, s. 5005-5012Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The lubrication of titania surfaces using a series of ionic liquid (IL)-hexadecane mixtures has been probed using nanoscale atomic force microscopy (AFM) and macroscale ball-on-disk tribometer measurements. The IL investigated is trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate, which is miscible with hexadecane in all proportions. At both length scales, the pure IL is a much more effective lubricant than pure hexadecane. At low loads, which are comparable to common industrial applications, the pure IL reduces the friction by 80% compared to pure hexadecane; while the IL-hexadecane mixtures lubricate the titania surface as effectively as the pure IL and wear decreases with increasing IL concentration. At high test loads the adsorbed ion boundary layer is displaced leading to surface contact and high friction, and wear is pronounced for all IL concentrations. Nonetheless, the IL performs better than a traditional zinc-dialkyl-dithophosphate (ZDDP) antiwear additive at the same concentration.

  • 39.
    Li, Jing
    et al.
    KTH Royal Institute of Technology, Sweden.
    Ecco, Luiz
    University of Trento, Italy.
    Ahniyaz, Anwar
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Fedel, Michele
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Pan, Jinshan
    KTH Royal Institute of Technology, Sweden.
    In situ AFM and electrochemical study of a waterborne acrylic composite coating with CeO2 nanoparticles for corrosion protection of carbon steel2015Ingår i: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 162, nr 10, s. C610-C618Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The corrosion protection of a waterborne acrylic composite coating with 1 wt% ceria nanoparticles (CeNP) coated on carbon steel in 3 wt% NaCl solution was investigated by ex-situ and in situ as well as electrochemical atomic force microscopy (AFM) observations, combined with open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) measurements. The synthesized CeNP were stabilized by acetic acid. The transmission electron microscopy characterization showed fine nano-size of as-synthesized CeNP, the ex-situ AFM imaging revealed uniform dispersion of the CeNP in the composite coating and greatly reduced nano-sized pinholes in the coating. The in situ and electrochemical (EC) AFM investigations indicate release of some CeNP and aggregates from the coating surface and then precipitation of some particles and cerium-compounds during the exposure. The OCP and EIS results demonstrated that the addition of 1 wt% CeNP leads to a significantly improved long term barrier type corrosion protection of the waterborne acrylic composite coating for carbon steel in 3 wt% NaCl solution. The beneficial effect of the CeNP is attributed to the blocking of nano-sized defects and inhibition by the cerium compounds originated from the acetic acid stabilized CeNP.

  • 40.
    Lindahl, Carl
    et al.
    University of Gothenburg, Sweden; Uppsala University, Sweden.
    Xia, Wei
    University of Gothenburg, Sweden; Uppsala University, Sweden.
    Engqvist, Håkan
    University of Gothenburg, Sweden; Uppsala University, Sweden.
    Snis, Anders
    University of Gothenburg, Sweden; Arcam AB, Sweden.
    Lausmaa, Jukka
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik. University of Gothenburg, Sweden.
    Palmquist, Anders
    University of Gothenburg, Sweden.
    Biomimetic calcium phosphate coating of additively manufactured porous CoCr implants2015Ingår i: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 353, s. 40-47Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The aim of this work was to study the feasibility to use a biomimetic method to prepare biomimetic hydroxyapatite (HA) coatings on CoCr substrates with short soaking times and to characterize the properties of such coatings. A second objective was to investigate if the coatings could be applied to porous CoCr implants manufactured by electron beam melting (EBM). The coating was prepared by immersing the pretreated CoCr substrates and EBM implants into the phosphate-buffered solution with Ca2+ in sealed plastic bottles, kept at 60 °C for 3 days. The formed coating was partially crystalline, slightly calcium deficient and composed of plate-like crystallites forming roundish flowers in the size range of 300-500 nm. Cross-section imaging showed a thickness of 300-500 nm. In addition, dissolution tests in Tris-HCl up to 28 days showed that a substantial amount of the coating had dissolved, however, undergoing only minor morphological changes. A uniform coating was formed within the porous network of the additive manufactured implants having similar thickness and morphology as for the flat samples. In conclusion, the present coating procedure allows coatings to be formed on CoCr and could be used for complex shaped, porous implants made by additive manufacturing.

  • 41.
    Luksepp, Tomas
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB.
    Norman, L
    Ingemarsson, Lars-Olof
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB.
    Wanderbäck, Fredrik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB.
    Bonding CFRP to steel and thermal issues at elevated temperatures: Joining in Car Body Engineering2014Konferensbidrag (Övrigt vetenskapligt)
  • 42.
    Magagnin, Luca
    et al.
    Politechnico de Milano, Italy.
    Leisner, Peter
    RISE - Research Institutes of Sweden, Säkerhet och transport, Elektronik. Jönköping University, Sweden.
    Professor Pietro Luigi Cavallotti: 11 November 1938 – 12 October 20172018Ingår i: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, E-ISSN 1745-9192, Vol. 96, nr 1, s. 7-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 43.
    Meroufel, Abdelkader
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Korrosion.
    Gordon, Andrew
    RISE Research Institutes of Sweden, Material och produktion, Korrosion.
    Thierry, Dominique
    RISE Research Institutes of Sweden, Material och produktion, Korrosion.
    Cathodic protection shielding of coated buried pipeline2024Ingår i: Journal of Coatings Technology and Research, ISSN 1945-9645, Vol. 21, s. 445-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    During the 2000s, the concept of cathodic protection (CP) shielding was first raised in open literature and remains debated between coatings professionals. The mechanism of CP shielding, and its understanding continue to be studied for different coatings with different approaches and using various techniques. From the CP shielding factors to the assessment methods, the published literature merits a deep analysis to capture the established knowledge and identify the research gaps to further tackle the issue for reliable coated buried structures. A holistic approach to this topic seems necessary where coatings ageing, cathodic protection, electrochemistry, and transport processes should be considered. In the first part of the present review, the recent works related to the understanding of CP shielding, coatings properties were considered before discussing the mechanisms involved underneath coatings. Transport phenomena and their relationship with cathodic protection performance in the presence of chemical and microbiological processes are discussed in the second part. Finally, CP shielding assessment methods and modeling works are presented and discussed from different perspectives. 

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  • 44.
    Neikter, M.
    et al.
    University West, Sweden.
    Bhaskar, P.
    University West, Sweden.
    Singh, S.
    Osaka University, Japan.
    Kadoi, K.
    Osaka University, Japan.
    Lyphout, Christophe
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Svahn, F.
    GKN Aerospace Sweden AB, Sweden.
    Pederson, R.
    University West, Sweden.
    Tensile properties of laser powder bed fusion built JBK-75 austenitic stainless steel2023Ingår i: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 874, artikel-id 144911Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Laser powder bed fusion (PBF-LB) is an additive manufacturing (AM) process that has several advantages to conventional manufacturing, such as near net-shaping capabilities and reduced material wastage. To be able to manufacture a novel material, however, one needs to first optimize the process parameters, to decrease porosity content as low as possible. Therefore, in this work the process parameters of PBF-LB built JBK-75 austenitic stainless steel, and its influence on porosity, microstructure, and hardness have been investigated. The least amount of porosity was found by using 132 W laser power, 750 mm/s scan speed, layer thickness 30 μm, and 0.12 mm hatch distance. These process parameters were then used to manufacture material for tensile testing, to investigate the tensile properties of PBF-LB built JBK-75 and potential anisotropic behavior. Hot isostatic pressing (HIP) was also performed in two sets of samples, to investigate the effect of pore closure on the tensile properties. The ultimate tensile strength (UTS) for the un-HIPed specimens was 1180 (horizontally built) and 1110 (vertically built) MPa. For the HIPed specimens, it was 1160 (horizontally built) and 1100 (vertically built) MPa. The anisotropic presence was explained by the presence of texture, with a multiple of random distribution (MRD) up to 4.34 for the {001} planes, and defects. 

  • 45.
    Odeberg Glasenapp, Astrid
    et al.
    RISE - Research Institutes of Sweden, Bioekonomi, Papperstillverkning och förpackningar.
    Sundin, Maria
    RISE - Research Institutes of Sweden, Bioekonomi, Papperstillverkning och förpackningar.
    Nordlinder, Johanna
    Swedish patent- and registration office, Sweden.
    Berthold, Jesper
    RISE - Research Institutes of Sweden, Bioekonomi, Papperstillverkning och förpackningar.
    Alfthan, Johan
    RISE - Research Institutes of Sweden, Bioekonomi, Papperstillverkning och förpackningar.
    Water-free bonding of corrugated board2018Ingår i: Packaging: Driving a sustainable future / [ed] Wang S-W, 2018, s. 608-616Konferensbidrag (Refereegranskat)
    Abstract [en]

    The "water-free bonding of corrugated board" concept focuses on thedevelopment, waste management and market potential of a new corrugated board production method. It has earlier been shown that by integrating PLA into paper, certain mechanical properties of corrugated board papers can be enhanced. These enhanced papers have been used for producing corrugated board. Corrugated board is usually produced by gluing the corrugated board paper layers with a starch suspension. This process is reducing the mechanical paper strength and is also energy consuming, as the water added by the starch suspension in the process has to be evaporated. In this study, two new water-free joining techniques for corrugated board have been investigated: PLA-welding, which melts the inherent PLA of the paper to create a bond and using PLA as an adhesive. Both techniques have shown promising results and are recommended for further investigation, however, replacing starch glue with PLA seems to be a solution closer to the market. For the material to fit in a future circular economy it is important that the waste is managed in a way that is sustainable for the environment and the society. Repulp ability testing in combination with literature studies indicate that the new material would be possible to recycle, and that the new material could function in every step described in the EU Waste Framework Directive.

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  • 46.
    Oko, Asaf
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Polymer och fiber.
    Brandner, Birgit
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik. KTH Royal Institute of Technology, Sweden.
    Bugner, Douglas E.
    Eastman Kodak Company, USA.
    Swerin, Agne
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor. Eastman Kodak Company, USA.
    Claesson, Per
    RISE., SP – Sveriges Tekniska Forskningsinstitut. KTH Royal Institute of Technology, Sweden.
    Aggregation of inkjet ink components by Ca and Mg ions in relation to colorant pigment distribution in paper2014Ingår i: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 456, nr 1, s. 92-99Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Papers coated with salts containing divalent cations exhibit superior inkjet print quality, which has been suggested to be due to fast aggregation of the colorant pigments close to, or even on, the surface of the paper. In this work we show the pivotal role of the carboxylic acid containing dispersing polymer. We report a series of aggregation and sedimentation experiments with commercial inks, generic ink formulations and specific ingredients comprising these formulations, and find differences in their response to the presence of MgCl2 or CaCl2. In particular, flocs and sediments formed in the presence of MgCl2 are denser than those formed in the presence of CaCl2. These differences are not predicted by the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. We suggest that ion specific interactions occurring between Mg2+ or Ca2+, and charged carboxylate groups residing on the dispersing polymers, provoke the observed behavior.

  • 47.
    Oko, Asaf
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik.
    Claesson, Per M.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik. KTH Royal Institute of Technology, Sweden.
    Niga, Petru
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Life Science.
    Swerin, Agne
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Measurements and dimensional scaling of spontaneous imbibition of inkjet droplets on paper2016Ingår i: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 31, nr 1, s. 156-169Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We investigate theoretically and experimentally the spontaneous imbibition of water based inkjet formulations utilizing paper capillary rise and imbibition of inkjet drops. We approximate the paper structure to a two dimensional anisotropic porous material, and using Darcy's law as a base, we derive dimensionless groups that scale drop imbibition. This derivation is based on a previous dimensional scaling of drop imbibition on thick isotropic porous material. We apply this scaling to a paper substrate by measuring the average drop imbibition rate, and perform paper capillary rise experiments to obtain the average system parameters required for the scaling. The results suggest that this approach is a valuable tool to predict drop imbibition rates on paper. We then continue and perform the same sets of experiments on a different paper with similar structure that is surface treated (surface sized) with CaCl2 salt, an additive that is known to improve print quality. We find that due to rapid aggregation of the colorant ink by the CaCl2, the imbibition rate is slowed down in the capillary rise experiments, i.e., on much larger scales compared to a single inkjet drop. However, the presence of CaCl2 has only minor effect over the average imbibition rates of single drops. Imbibition rates on the CaCl2 surface sized paper did not give adequate scaling as a result of the fact that the aggregation was not included the theoretical assumptions behind the scaling.

  • 48.
    Oko, Asaf
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik.
    Swerin, Agne
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Infiltration and dimensional scaling of picoliter inkjet drops on nano- and microporous materials – isotropic porous glass and anisotropic paper2016Ingår i: Annual Surface and Materials Chemistry Symposium and Materials for tomorrow (ASMCS 2016), 2016Konferensbidrag (Refereegranskat)
  • 49.
    Ovaska, Sami-Seppo
    et al.
    Lappeenranta University of Technology, Finland.
    Hiltunen, Salla
    Lappeenranta University of Technology, Finland.
    Ernstsson, Marie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Schuster, Erich
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Food and Bioscience, Structure Design.
    Altskär, Annika
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Food and Bioscience, Structure Design.
    Backfolk, Kaj
    Lappeenranta University of Technology, Finland.
    Characterization of rapeseed oil/coconut oil mixtures and their penetration into hydroxypropylated-starch-based barrier coatings containing an oleophilic mineral2016Ingår i: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 101, s. 569-576Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A study was conducted that demonstrated that the blending of edible oils leads to changes in surface tension, thermal properties, viscosity, and oil penetration times through a barrier-coated paperboard. The results emphasize the significance of testing the oil and grease resistance (OGR) oil blends in order-to verify the suitability of the packaging material for real-life end-use applications. The results of the OGR determinations suggest that hydroxypropylated-starch-based composite coatings containing an oleophilic high aspect ratio mineral can be tailored for food shaving different fatty acid compositions by varying the pigmentation level. Compared to standard OGR tests, confocal laser scanning microscopy (CLSM)-based techniques make it possible to evaluate the oil penetration time and its diffusion behavior very accurately, both inside the coating layer and in the bulk matrix. It was found that, at room temperature, coconut oil tends to crystallize inside the substrate, inducing swelling of the coating layer, which probably has an influence on the physicomechanical properties of the packaging material.

  • 50.
    Pant, Prabhat
    et al.
    Linköping University, Sweden.
    Salvemini, Filomena
    ANSTO, Australia.
    Proper, Sebastian
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Luzin, Vladimir
    ANSTO, Australia; University of Newcastle, Australia.
    Simonsson, Kjell
    Linköping University, Sweden.
    Sjöström, Sören
    Linköping University, Sweden.
    Hosseini, Seyed
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Peng, Ru Lin
    Linköping University, Sweden.
    Moverare, Johan
    Linköping University, Sweden.
    A study of the influence of novel scan strategies on residual stress and microstructure of L-shaped LPBF IN718 samples2022Ingår i: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 214, artikel-id 110386Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Process parameters in laser-based powder bed fusion (LBPF) play a vital role in the part quality. In the current study, the influence of different novel scan strategies on residual stress, porosities, microstructure, and crystallographic texture has been investigated for complex L-shape parts made from nickel-based superalloy Inconel 718 (IN718). Four different novel scanning strategies representing total fill, re-melting, and two different sectional scanning strategies, were investigated using neutron diffraction, neutron imaging, and scanning electron microscopy techniques. These results were compared with the corresponding results for an L-shape sample printed with the conventional strategy used for achieving high density and more uniform crystallographic texture. Among these investigated novel strategies, the re-melting strategy yielded approximately a 25% reduction in surface residual stress in comparison to the reference sample. The other two sectional scanning strategies revealed porosities at the interfaces of the sections and due to these lower levels of residual stress were also observed. Also, variation in crystallographic texture was observed with different scan strategies. © 2022 The Author(s)

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