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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 9    No. 4    December 1999

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Carbon-fiber-reinforced silicon carbide composites prepared by precursor pyrolysis-hot pressing
He Xinbo(何新波); Zhang Xinming(张新明); Zhang Changrui(张长瑞); Zhou Xingui(周新贵); Zhou Anchen(周安郴)

Department of Materials Science and Engineering; Central South University of Technology; Changsha 410083; P. R. China;
Department of Materials Engineering and Applied Chemistry; National Uni

Abstract:The Cf/SiC composites were prepared by precursor conversion-hot pressing sintering with AIN and Y2Os 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 75O℃ 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 2O. 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 85O℃ displayed brittle failure, which mainly attributed to the strongly bonded fiber/matrix interface and the degradation of the properties of the fibers.

 

Key words:  precursor pyrolysis-hot pressing; C_f/SiC composites; sintering temperature

ISSN 1672-7029
CN 43-1423/U

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