Fabrication of Silicon Nitride Ceramics with Magnesium Silicon Nitride and Yttrium Oxide as Sintering Additives
Si3N4 ceramics have been fabricated through pressureless sintering and hot-pressmg smtenng with MgSiN2-Y2O3 or only MgSiN2 as sintering additive,respectively. The effects of MgSiN2 and Y2O3 and sintering methods on sintering properties of Si3N4 ceramics were studied. The results indicate that the bend strength of Si3N4 ceramic with 5.6wt.％MgSiN215.8wt.％Y2O3 sintered at 1820℃ for 4h could achieve 839MPa. The bend strength of Si3N4 ceramic with 4.76wt.％MgSiN2 produced by hot-pressing sintering at 1750℃ for 1h under uniaxial pressure of 20MPa is 1149MPa. The thermal conductivity of the Si3N4 ceramic was 92W·m-1·K-1 and could remarkably increase to 129W·m-1·K-1 by prolonging the sintering time from 1 h to 12 h. The present work demonstrated that MgSiN2 additives and hot-pressing sintering were effective to improve the thermal conductivity of Si3N4 ceramic.
Si3N4 ceramics MgSiN2 Puressureless sintering Hot-pressing sintering
Jiang Guojian Xu Jiayue Shen Hui Zhang Yan Peng Guihua Zhuang Hanru Li Wenlan Xu Suying Mao Yongjun
Shanghai Institute of Technology,Shanghai 200235,China Guangxi Normal University,Guilin 541004,Guangxi,China Shanghai Institute of Ceramic,Chinese Academy of Sciences,Shanghai 200050,China Shanghai University,Shanghai 200444,China
国际会议
Frist Annual Meeting on Testing and Evaluation of Inorganic Materials(第一届全国无机材料测试与评价学术年会)
南昌
英文
235-237
2010-04-28（万方平台首次上网日期，不代表论文的发表时间）