1 College of Materials and Chemistry, China Jiliang University, Hangzhou 310018, China 2 Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
Abstract: The sapphire samples with high transmittance were prepared successfully by in-situ surface vitrification process. The UV-visible transmittance spectra results show that the transmittance of rough surface sapphire was greatly improved. The theoretical transmittance of sapphire was enhanced from 85% to 90.2% by vitrification process. The physical properties, such as coefficient of thermal expansion (CTE), differential scanning calorimetry (DSC), refractive index and microhardness, have been measured and systematically discussed. The results show that the glass coating has good thermostability, excellent thermal expansion matching with sapphire and high microhardness. It is important that those properties can be tuned by adjusting the glass coating composition and thickness. This study indicates that the in-situ surface vitrification is an effectively method to reduce the polishing time and cost of sapphire and enhance the optical properties. It provides a useful guide toward the development of surface treatment technology.
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2021, Vol. 35 
