Fundamental Research on Carbon-based Composites with High Resistant Property for Oxidation.

点击翻译按钮获取中文摘要

1) Oxidation of mesophase-pitch carbon fibers with different microstructure and different graphitization degree were investigated and compared with those of PAN carbon fiber. Striation and pits formed on the surface by oxidation and the morphological change suggested that oxidation behavior was affected strongly by microstructure of the fiber.2) High temperature oxidation tests for carbon/B_4C/SiC composites showed that there were three different oxidation behaviours depending on the range of oxidation temperature of below 700ﾟC, 800-1000ﾟC and above 1100ﾟC. The oxide layer formed at 1200ﾟC was suggested to be SiO_2 rich phase and remark-ably stable as a protective layer against oxidation.3) Boron-doping was known to be effective to improve oxidation resistance of carbon fiber and C/C composite.