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URN etd-0713104-162231 Statistics This thesis had been viewed 2718 times. Download 1306 times. Author Chien-Ming Tseng Author's Email Address firstname.lastname@example.org Department Materials Engineering Year 2004 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 49 Title Melt coating of sapphire surface for middle IR transmission Keyword sapphire melt coating IR window IR window melt coating sapphire Abstract In this research, infrared transmittable glasses (Corning 9754, CaO-Al2O3 glass) were used to thermo coat on sapphire surface. Results showed that short duration (＜15 min))at 1450℃ (accomplished by isothermal heating and cooling ) left glass on the sapphire surface as transparent glass after thermal coating. The 9754 glass showed good infrared transmittance. After coating with glass, unpolished sapphire surfaces became smooth, and the infrared transmittance of the sapphire reached about 80%. In additional, the flexural strength increased, to reach the valves of sapphire with all polish sapphire surface. However, the CaO in 9754 glass can easily react with Al atoms in sapphire and crystallization “CaAl12O19” occurred. Because of CaAl12O19, the sample will become misty. Advisor Committee Yung-Jen Lin - advisor
Jiin-Jyh Shyu - co-chair
Long-Jeng Hu - co-chair
Files Date of Defense 2004-06-15 Date of Submission 2004-07-13