注凝成型制备莫来石–钛酸铝复相陶瓷(英文)  

PREPARATION OF MULLITE-ALUMINIUM TITANATE CERAMIC COMPOSITES VIA GELCASTING

作　　者：陆洪彬[1,2] 陈建华[3] 冯春霞[1] 焦宝祥[1] 孟祥康[2] 

机构地区：[1]盐城工学院材料工程学院,江苏盐城224051 [2]南京大学材料科学与工程系固体微结构国家实验室,南京210093 [3]常熟理工学院江苏省新型功能材料实验室,江苏常熟215500

出　　处：《硅酸盐学报》2009年第5期719-723,共5页Journal of The Chinese Ceramic Society

基　　金：江苏省自然科学基金资助项目(BK2002044);江苏省生态环境材料重点实验室开放基金(XKY2008058)资助项目

摘　　要：引入10%(摩尔分数,相对于Al2O3,下同)MgO和15%SiO2双组分添加剂合成了钛酸铝粉体。采用不同质量比的钛酸铝粉体和工业莫来石,用干压和注凝成型工艺制备了莫来石-钛酸铝(mullite-aluminium titanate,MAT)复相陶瓷。用X射线衍射分析了双组分添加剂对钛酸铝相组成和热稳定性的影响,通过扫描电镜表征了MAT复相陶瓷的微结构。研究了钛酸铝含量对采用干压、注凝2种成型工艺制备的MAT复相陶瓷的弯曲强度和平均热膨胀系数(室温～1000℃)的影响。结果表明:MgO和SiO2双组分添加剂促进了钛酸铝的形成,增强了钛酸铝的热稳定性。通过注凝成型制备的MAT复相陶瓷比干压成型制备的MAT复相陶瓷具有更均匀的结构和更高的机械性能。当钛酸铝含量为10%(质量分数,下同),运用注凝成型工艺制备的MAT复相陶瓷的弯曲强度最大,达110.05MPa。The mullite-aluminium titanate （MAT） ceramic composites were prepared via the gelcasting or dry pressing processes using industrial mullite and aluminium titanate （Al2TiO5） powders with different mass ratios, that titanate was synthesized by doping the hi-component additive of 10% （in mole, the same below） MgO and 15% SiO2 relative to Al2O3. Effects of the bi-component additive on the phase composition and thermal stabilization of aluminium titanate powder were analyzed by X-ray diffraction and the micro-structures of MAT ceramic composites were characterized by scanning electron microscopy. The effects of aluminium titanate content on the bending strength and average thermal expansion coefficient （room temperature-1 000℃） of the MAT ceramic composites prepared by dry pressing or gelcasting shaping processes were also investigated. The results show that the hi-component additive of MgO and SiO2 can promote the formation of Al2TiO5 and enhance its thermal stabilization. The MAT ceramic composites prepared by gelcasting process obtain more homogenous structure and higher bending strength than that prepared by dry pressing process. The MAT ceramic composite prepared by gelcasting process and containing 10% （mass fraction） Al2TiO5 has the maximum bending strength of 110.05 MPa.

关 键 词：注凝成型 钛酸铝 莫来石 热稳定性 弯曲强度 

分 类 号：TQ174[化学工程—陶瓷工业]