摘要
本文研究了以正硅酸乙酯(TEOS)和硝酸铝为原料,用溶胶-凝胶法制备莫来石粉末的过程。探讨了温度和pH值对Al2O3-SiO2凝胶时间的影响;用IR和XRD研究了凝胶在热处理过程中的晶相变化。研究结果表明:温度升高,凝胶时间缩短;pH=3时,溶胶的聚集速度减慢,胶凝时间较长;莫来石相是经铝硅尖晶石转化而成,铝硅尖晶石在1000℃开始转化为莫来石,至1250℃全部转化;制备的莫来石粉末晶粒尺寸为100～200nm。
Mullite powder was synthesized by Sol-Gel process using TEOS and Al （NO3）3-9H2O as raw materiais.The influence of temperature and pH value on the gelation time of Al2O3-SiO2 was discussed. The existence of Si-O-Al bond and its changes under heat treatment were determined by IR and XRD. The results showed that mullite was derived from aluminium-silicon spineland. The transformation started at 1000℃ and finished at 1 250℃ and the mullite powder obtained had uniform grain size of 100-200nm.
出处
《佛山陶瓷》
2005年第11期9-11,共3页
Foshan Ceramics
关键词
莫来石
sol—gel
制备
mullite powder, Sol-Gel method, preparation
