Microstructure and thermal expansion behavior of diamond/SiC/(Si) composites fabricated by reactive vapor infiltration

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• 作者：Zhenliang Yang ; Xinbo He ; Ligen Wang ; Rongjun Liu ; Haifeng Hu ; Limin Wang ; Xuanhui Qu
• 关键词：Sintering ; Composites ; Thermal properties ; SiC
• 刊名：Journal of the European Ceramic Society
• 出版年：May, 2014
• 年：2014
• 卷：34
• 期：5
• 页码：1139-1147
• 全文大小：5759 K

文摘

Diamond/SiC/(Si) composites were fabricated by Si vapor vacuum reactive infiltration. The coefficient of thermal expansion (CTE) of composites have been measured from 50 to 400 掳C. With the diamond content increasing, CTE of composite decreased, simultaneously, the microstructure of the composites changed from core-shell particles embedded in the Si matrix to an interpenetrating network with the matrix. The CTEs of composites versus temperature matched well with those of Si. The Kerner model was modified according to the structural features of the composites, which exhibited more accurate predictions due to considering the core-shell structure of the composites. The thermal expansion behavior of the matrix was constrained by diamond/SiC network during heating.