Carbon-fiber-reinforced silicon carbide composites prepared by precursor pyrolysis-hot pressing
来源期刊：中国有色金属学报(英文版)1999年第4期
论文作者：何新波 张新明 张长瑞 周新贵 周安郴
文章页码：778 - 784
Key words：precursor pyrolysis-hot pressing; Cf /SiC composites; sintering temperature
Abstract: The Cf/SiC composites were prepared by precursor conversion-hot pressing sintering with AIN and Y20s as additives. The effects of sintering temperature and additives on the microstructures and properties of the composites were investigated. The composite sintered at as low as 1 750℃ already showed higher density and better mechanical properties, which was mainly attributed to the liquid-phase-sintering and the formation of the AIN-SiC solid solution. With increasing the sintering temperature to 1 800 ℃, the flexural strength and fracture toughness of the composite were substantially improved up to 691. 6 MPa and 20. 7 MPa' m1/2 respectively in spite of the slightly elevated density, and the composite exhibited "tough" failure. Despite the improved density, the composite sintered at 1 850℃ displayed brittle failure, which mainly attributed to the strongly bonded fiber/matrix interface and the degradation of the properties of the fibers.
