(中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 在预制体炭纤维预石墨化前对其进行硼酸处理，研究硼酸对炭纤维性能，C/C复合材料导热率的影响及其作用机理。结果表明：硼酸通过高温热处理过程所分解的硼对炭纤维起到了有效的催化石墨化作用，显著提高炭纤维的石墨化性能，改善炭纤维的表面状态，从而有效地促进CVI过程中炭纤维表面沉积较高织构热解炭。通过对炭纤维以及热解炭微观炭结构的调整，硼酸的添加可有效地提高C/C复合材料的导热性能。
关键字: C/C复合材料；硼酸；催化石墨化；导热
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The effect of boric acid on carbon fiber properties and thermal conductivity of carbon carbon composites was investigated by dipping preform in boric acid before pretreatment. The results show that the deposited boron from boric acid has catalytic-graphitization effect on carbon fibers through high temperature treatment (HTT), which enhances the graphitization property of carbon fibers and meliorates the surface state of carbon fibers. Through regulating microcosmic carbon structure of carbon fibers and carbon matrix, boric acid improves thermal conductivity of C/C composites distinctly.
Key words: carbon/carbon composite; baric acid; catalytic graphitization; thermal conductivity
