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MgO–Al2O3–CeO2 复合烧结助剂对放电等离子烧结氮化硅陶瓷致密化和性能的影响

DOI: 10.14062/j.issn.0454-5648.2015.12.06

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Abstract:

以MgO–Al2O3–CeO2复合体系为烧结助剂,采用放电等离子烧结工艺制备氮化硅陶瓷。研究了MgO–Al2O3–CeO2含量、烧结温度对氮化硅陶瓷显微结构及力学性能的影响;探讨了复合烧结助剂作用下氮化硅陶瓷的烧结机理。结果表明当混合粉体中Si3N4、MgO、Al2O3和CeO2的质量比为91333、烧结温度为1600℃时,氮化硅烧结体相对密度(99.70%)、硬度(18.84GPa)和断裂韧性(8.82MPa?m1/2)达最大值,晶粒以长柱状的β相为主,α-Si3N4→β-Si3N4相转变率达93%;当混合粉体中Si3N4、MgO、Al2O3和CeO2的质量比为88444、烧结温度为1600℃时,烧结体抗弯强度(1086MPa)达到最大值。

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