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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 1    February 2002

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Effect of fiber characteristics on fracture behavior of
Cf/SiC composites
HE Xin-bo(何新波)1,YANG Hui(杨  辉)1,ZHANG Xin-ming(张新明)2

1. Department of Materials Science and Engineering,
 Zhejiang University, Hangzhou 310027, China;
2. Department of Materials Science and Engineering,
 Central South University, Changsha 410083, China

Abstract:Cf/SiC composites were prepared by precursor pyrolysis-hot pressing, and the effect of fiber characteristics on the fracture behavior of the composites was investigated. Because the heat treatment temperature of fiber T300 (below 1500 ℃) was much lower than that of fiber M40JB (over 2000℃), fiber T300 had lower degree of graphitization and consisted of more impurities compared with fiber M40JB, suggesting that T300 exhibits higher chemical activity. As a result, the composite with T300 showed a brittle fracture behavior, which is mainly ascribed to a strongly bonded fiber/matrix interface as well as the degradation of fibers during the preparation of the composite. However, the composite wit h M40JB exhibits a tough fracture behavior, which is primarily attributed to aweakly bonded fiber/matrix interface and higher strength retention of the fibers.

 

Key words:  Cf/SiC composites; fiber characteristics; fracture behavior

ISSN 1672-7029
CN 43-1423/U

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