(1.武漢工業(yè)大學新材料研究所，武漢430070；
2.中南工業(yè)大學粉冶所，長沙410083)
摘 要: 系統(tǒng)研究了MgO-CeO2燒結(jié)助劑對常壓燒結(jié)氮化硅陶瓷致密化過程及其性能的影響，發(fā)現(xiàn)MgO-CeO2是一種非常有效的燒結(jié)助劑，其致密化效果比單獨用MgO或CeO2要好得多，常壓燒結(jié)的Si3N4-MgO-CeO2陶瓷，相對密度為98.5%，室溫強度可達948 MPa。
關(guān)鍵字: Si3N4 燒結(jié) 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
