超重力燃烧合成熔铸Al_2O_3陶瓷晶粒刻面形貌的形成机理  

MECHANISM OF FACETED MORPHOLOGY OF BULK ALUMINA FABRICATED BY COMBUSTION SYNTHESIS MELTED CASTING UNDER ULTRA-HIGH GRAVITY

作　　者：裴军[1,2] 李江涛[1] 宋月鹏[1] 

机构地区：[1]中国科学院理化技术研究所,北京100080 [2]中国科学院研究生院,北京100039

出　　处：《硅酸盐学报》2009年第7期1177-1181,共5页Journal of The Chinese Ceramic Society

基　　金：国家"863"计划(2006AA03Z112);国家自然科学基金(50772116)资助项目

摘　　要：晶体学刻面形貌是超重力燃烧合成熔铸制备Al2O3陶瓷的一个重要微观结构特征,这种刻面形貌的形成取决于熔铸制备技术本身的液固界面结构,而液–固界面结构又由界面热力学所决定。通过对界面热力学的计算可知Al2O3陶瓷凝固过程中微观液–固界面Gibbs自由能最低时所对应的稳定界面结构为光滑界面即刻面。The crystallographic faceted morphology of bulk alumina fabricated by combustion synthesis melt casting under ultra-high-gravity is a significant microstructure feature. The development of the faceted morphology depends on the interface structure of the liquid-solid phase, and the interface structure is decided by the interface thermodynamics. The deduction and calculation of interface thermodynamics indicate that the micro-interface is faceted corresponding to the minimum Gibbs free energy of the micro-interface during the solidification of alumina ceramics.

关 键 词：氧化铝 刻面 界面 

分 类 号：TB321[一般工业技术—材料科学与工程]