立方相白榴石的合成与稳定  

Synthesis and Stabilization of Cubic Leucite

作　　者：黄丽婷[1] 刘洋[1] 彭诚[1] 吴建青[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广州510640

出　　处：《硅酸盐学报》2017年第7期948-954,共7页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51472092)资助项目

摘　　要：采用固相法合成了室温下稳定的立方相白榴石。探讨了Cs_2O的添加量、热处理温度及保温时间对立方相白榴石的形成及稳定的影响,用扫描电子显微镜分析了合成的白榴石粉体的显微形貌,热膨胀仪测定了立方相白榴石粉体的热膨胀系数。研究表明:按照白榴石的化学计量比,通过适当添加CsNO_3和热处理,当部分K_2O被Cs_2O取代后,可以获得室温下稳定的立方相白榴石。该立方相白榴石在30~700℃范围内的平均热膨胀系数约为17.3×10^(-6)/℃,明显低于常温下稳定的四方相白榴石的热膨胀系数。The Cubic leucite stabilized at room temperature was synthesized by a solid-state reaction method. The effects of amount of Cs2O, heat treatment temperature and soaking time on the formation and stability of cubic leucite were investigated. The microstructure of leucite was determined by scanning electron microscopy. The coefficient of thermal expansion （CTE） of the synthesized cubic leucite was measured by a thermal dilatometric analyzer. The results show that when a proper amount of CsNO3 is added into the chemical composition of leucite and heat treated for a certain time, cubic leucite can be stabilized at room temperature after a part of K2O is replaced by Cs2O. The average CTE of the stabilized cubic leucite samples at 30-700 ℃is 17.3×10^-6 /℃, which is apparently lower than that of the tetragonal leucite.

关 键 词：立方相白榴石 氧化铯 热处理温度 保温时间 热膨胀系数 

分 类 号：TQ174.1[化学工程—陶瓷工业]