(1.武漢工業(yè)大學(xué)新材料研究所，武漢430070；
2.中南工業(yè)大學(xué)粉末冶金研究所，長(zhǎng)沙410083)
摘 要: 討論了Si3N4-MgO-CeO2陶瓷常壓燒結(jié)過(guò)程中的致密化與相變。指出:對(duì)于Si3N4-MgO-CeO2陶瓷，在1500~1550℃為快速致密化階段，在1 550℃致密化過(guò)程已接近完成，α-Si3N4→β-Si3N4的相轉(zhuǎn)變過(guò)程滯后于致密化過(guò)程，在1550~1600℃為β相轉(zhuǎn)變百分?jǐn)?shù)急劇增加階段，在1600℃，α→β相變接近完成。α→β相變與其致密化并無(wú)直接、必然的關(guān)系。
關(guān)鍵字: 氮化硅 致密化 相變
SINTERING OF Si3N4-MgO-CeO2CERAMICS
（1．National Lab for Hybrid Materials, Wuhan University of Technology, Wuhan 430070
Research Institute ofPowder Metallurgy,
2.Central South University of Technology, Changsha 410083）
Abstract:The effect of pressureless sintering on the densification and phase transformation of Si3N4-MgO-CeO2 ceramics was studied. For the Si3N4-MgO-CeO2ceramics, the densification process took place rapidly from 1500 to 1550℃and nearly completed at 1550℃; the phase transformation fromα-Si3N4toβ-Si3N4 took place rapidly from 1550 to 1600℃and nearly completed at 1600℃. The phase transformation process is behind the densification process and does not necessarily promote the densification of the Si3N4-MgO-CeO2ceramics.
Key words: Si3N4 densification phase transformation
