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Novel thermo-chemical strengthening of glass for solar energy applications and its impact on the physical properties
RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry and Materials.
RISE - Research Institutes of Sweden, Built Environment, Building Technology. (Glass)ORCID iD: 0000-0001-7925-6137
Johnson Matthey Technology Centre, UK.
Johnson Matthey Technology Centre, UK.
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2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

The LIMES project (Light Innovative Materials for Enhanced Solar Efficiency), a Solar-ERA.NET project, have been a fruitful collaboration project to optimize many different properties in state-of-the-art solar glasses for photovoltaic (PV) modules. Here, we present results related to the effectiveness of reactive gas strengthening and its improvement of the physical properties of thin glasses. Novel thermo-chemical strengthening has been created using reactive chemicals that react with the glass surface during the thermal strengthening process. The glass surface gets a markedly increase of Al2O3, which in previous studies has been shown to have a beneficial effect on the mechanical properties. Successful thermo-chemical strengthening of 4 and 2 mm glasses to a similar strengthening level have repeatedly been performed, polariscope images in Figure 1. The strengthening level has been quantified using SCALP (Scattered Light Polariscope) and were found to be in the range of 85-110 MPa of compressive stresses in the surface which are comparable to values for conventional thermally strengthened glass.

The strength of the glasses was quantified using the ring-on-ring method and the surface mechanical properties were evaluated by means of nano/microindentation. UV-Vis spectroscopy measurements have also been performed.

Results for the ring-on-ring tests show that the 2 mm thin glass were positively affected by the while 4 mm did not show any significant change as compared to thermally strengthened. The thermo-chemically strengthened glasses have a significantly higher crack resistance than both the reference float glass and the traditionally thermally strengthened glass. The hardness results show that for low loads, ≥1 mN, the hardness follow the order thermo-chemically strengthened glass > thermally strengthened glass > annealed float glass. The scratch resistance for thermo-chemically strengthened glass is increased as compared to ordinary float glass. In addition, the transmission is not markedly reduced.

Place, publisher, year, edition, pages
2017.
Keywords [en]
Thermal strengthening of glass, glass for solar energy, surface modification of glass
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-31879OAI: oai:DiVA.org:ri-31879DiVA, id: diva2:1152223
Conference
2017 ICG International Commission of Glass Annual Meeting & 32nd Şişecam Glass Symposium. Istanbul, Turkey.October 22-25th 2017
Funder
Swedish Energy Agency, 38349-1Available from: 2017-10-24 Created: 2017-10-24 Last updated: 2018-07-20Bibliographically approved

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