中國有色金屬學(xué)報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 12 No. 1 February 2002 |
Cf/SiC composites
（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:Cf/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
