(1.武汉工业大学新材料研究所，武汉430070；
2.中南工业大学粉冶所，长沙410083)
摘 要: 系统研究了MgO-CeO2烧结助剂对常压烧结氮化硅陶瓷致密化过程及其性能的影响，发现MgO-CeO2是一种非常有效的烧结助剂，其致密化效果比单独用MgO或CeO2要好得多，常压烧结的Si3N4-MgO-CeO2陶瓷，相对密度为98.5%，室温强度可达948 MPa。
关键字: Si3N4 烧结 致密化
DENSIFICATION OF Si3N4
（1.New Materials Research Institute, Wuhan University of Technology, Wuhan 430070
2.Powder Metallurgy Research Institute, Central South University of Technology, Changsha 410083）
Abstract:An investigation of the pressureless sintering of Si3N4with MgO-CeO2revealed that MgO-CeO2is a much more effective sintering aid for silicon nitride than either MgO or CeO2. The amount of MgO-CeO2and MgO/CeO2mass ratio have strong influence on the densification behaviour and mechanical properties of the sintered materials. The silicon nitride pressurelessly sintered with MgO-CeO2retains a relative density of 98.5% and a bending strength of 948 MPa.
Key words: Si3N4 sintering densification
