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烧结温度对Cf/SiC复合材料结构及性能的影响

丁玉生, 董绍明, 高乐, 何平, 张翔宇, 江东亮   

  1. 中国科学院 上海硅酸盐研究所, 上海 200050
  • 收稿日期:2007-09-27 修回日期:2008-05-13 出版日期:2008-11-20 网络出版日期:2008-11-20

Effect of Sintering Temperature on Microstructure and Properties of Cf/SiC Composites

DING Yu-Sheng, DONG Shao-Ming, GAO Le, HE Ping, ZHANG Xiang-Yu, JIANG Dong-Liang   

  1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
  • Received:2007-09-27 Revised:2008-05-13 Published:2008-11-20 Online:2008-11-20

摘要: 以碳纤维为增强体, 热压烧结制备了Cf/SiC复合材料, 研究了烧结温度对Cf/SiC复合材料密度、结构及性能的影响. 研究发现: 提高烧结温度能够促进Cf/SiC复合材料的致密度; 当烧结温度低于1850℃时, 升高烧结温度, 复合材料的强度和断裂韧性也随之提高. 当烧结温度为1850℃时, 复合材料的性能最优, 弯曲强度达500.1MPa, 断裂韧性为16.9MPa·m 1/2. 当烧结温度达到1880℃时, 复合材料性能反而下降.

关键词: Cf/SiC复合材料, 热压烧结, 液相

Abstract: Cf/SiC composites reinforced by carbon fiber were fabricated by hot-pressing. The effects of sintering temperature on the densities, microstructure and mechanical properties were studied. Densities of the Cf/SiC composites are increased with the increase of sintering temperature, and the bending strength and fracture toughness are increased with the sintering temperature increasing from 1800℃ to 1850℃, The highest bending strength and fracture toughness of the composites fabricated at 1850℃ are 500.1MPa and 16.9MPa·m 1/2, respectively. However, when the temperature increases to 1880℃, the mechanic properties of the composite decreases.

Key words: Cf/SiC composites, hot-pressing, liquid phase

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