摘要
对用溶胶—凝胶法制备的莫来石先驱粉末的晶化及烧结行为进行了研究。先驱粉末在１０００℃煅烧１ｈ形成少量尖晶石，在更高的温度由这种尖晶石相及无定形ＳｉＯ２相形成莫来石，煅烧后的粉末具有很高的活性，在１５５０℃烧成０５ｈ，烧结体相对密度达到９８７％，陶瓷显微结构由细小等轴莫来石晶粒构成，随着烧成时间的延长或烧成温度的升高，烧结体中的柱状莫来石晶粒变得越来越多。
The crystallization and sintering behavior of a mullite precursor powder prepared by sol gel process have been studied. Calcination of the mixture at 1000℃ for 1h gives a very active powder in the form of spinel, and mullite is formed via this spinel phase and amorphous SiO 2. The calcined powder can be reactively sintered at 1550℃ to 98.7% density in 0.5h with a very fine equiaxed grain morphology. With increasing sintering time or increasing sintering temperature, the microstructure of the sintered sample is characterized by more elongated mullite grains.
出处
《硅酸盐通报》
CAS
CSCD
1997年第6期27-31,共5页
Bulletin of the Chinese Ceramic Society
基金
国家"863"高技术新材料领域资助
