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采用热分析和红外光谱分析法 ,研究了 Si O2 凝胶薄膜热处理过程中的热失重和结构变化 ,确定了薄膜在室温～ 6 73K区间的分级热处理工艺和玻璃化处理温度。在熔模铸造壳型内表面基体玻璃涂层上制备了两类无裂纹 Si O2 薄膜涂层。析晶实验结果表明 ,第一类薄膜涂层在高温下为方
The thermal weight loss and structure change of Si O2 gel film during heat treatment were studied by means of thermal analysis and infrared spectroscopy. The heat treatment and glass transition temperature of the film at room temperature to 673K were determined. Two types of crack-free Si O2 thin film coatings were prepared on the glass substrate of the investment casting shell inner surface. Crystallization experimental results show that the first type of film coating at high temperatures for the square