复合添加剂对氮化硅陶瓷致密化的影响  

Effects of Composite Additives on Densification of Silicon Nitride Ceramics

作　　者：张勇[1] 王富成[1] 吴鹏[1] 孙洪魏[1] 胡行[1] 

机构地区：[1]郑州大学物理工程学院材料物理教育部重点实验室,郑州450052

出　　处：《材料导报（纳米与新材料专辑）》2008年第3期363-365,共3页

基　　金：河南省科技攻关项目(0062425001)

摘　　要：以MgO-Al_2O_3-Y_2O_3体系作为烧结助剂,研究添加剂含量对无压烧结氮化硅陶瓷致密化的影响。对MgO、Al_2O_3、Y_2O_3三元添加剂进行单纯形格子设计及回归分析。结果表明,复合添加剂的比例对样品致密化及显微结构有着显著的影响。MgO、Al_2O_3和Y_2O_3按一优化比例引入到氮化硅陶瓷时可实现最大致密化速率,同时氮化硅大都呈现长柱状β-Si_3N_4晶粒,具有较大的长径比,显微结构均匀。The MgO,Al2O3 and Y2O3 are selected to act as a ternary composite sintering additive and to study their effect on the densification of pressless sintered of silicon nitride ceramics at 1650℃ using simplex designs as well as regression analysis. The experimental results show that MgO-Al2O3-Y2O3 additive has significant influence on the densification and microstructure of the samples. The introduction of a certain ratio of MgO, Al2O3 and Y2O3 into silicon nitride ceramics can achieve a fastest densification rate and the resulting silicon nitride has an uniform microstructure with larger aspect ratio of elongated grains.

关 键 词：氮化硅 复合添加剂 致密化 单纯形设计 

分 类 号：TQ174.758[化学工程—陶瓷工业] TQ175.714[化学工程—硅酸盐工业]