原位合成Si_3N_4/BN纤维独石陶瓷高温强度的研究  

THE FLEXURAL STRENGTH OF THE Si_3N_4/BN FIBROUS MONOLITHIC CERAMIC AT ELEVATED TEMPERATURE BY IN-SITU SYNTHESIZING

作　　者：李淑琴[1] 黄勇[1] 昝青峰[1] 李翠伟[1] 

机构地区：[1]清华大学材料科学与工程系国家重点陶瓷实验室,100084

出　　处：《中国陶瓷》2001年第5期9-11,15,共4页China Ceramics

摘　　要：本实验对原位合成的Si3N4 /BN纤维独石高温强度的力学性能进行了研究。实验结果表明 :Si3N4 /BN纤维独石陶瓷具有优异的高温力学性能。单轴排布的纤维独石陶瓷随温度的升高 ,直至 1 0 0 0℃ ,抗弯强度基本没有下降。到 1 2 0 0℃ ,强度还保持在 60 0MPa以上 ,为室温强度的 85 %。实验通过扫描电镜SEM观察了材料的显微以及断口形貌 ,并对此材料具有优异的高温抗弯强度的机理进行了探索。The flexure strength of the Si\-3N\-4/BN fibrous monolithic ceramic by in-situ synthesizing was studied.The results showed that property of the composites was excellent.The flexure strength of Si\-3N\-4/BN fibrous monolithic ceramic with single axis did not degrade until 1000℃?The strength kept above 600MPa which was the 85 per cents of the strength at room temperature until 1200℃.The microstructure and the fracture morphology were observed by SEM and the mechanism that the materials possess excellent property was studied.

关 键 词：纤维独石 高温强度 显微结构 原位合成 陶瓷 氮化硅 纤维独石 氮化硼纤维独石 

分 类 号：TQ174.758[化学工程—陶瓷工业] TQ174.15[化学工程—硅酸盐工业]