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。
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.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2008年第5期783-788,共6页
The Chinese Journal of Nonferrous Metals
基金
C/C复合材料导热机制及设计资助项目(2006CB600907)
关键词
C/C复合材料
硼酸
催化石墨化
导热
carbon/carbon composite
baric acid
catalytic graphitization
thermal conductivity
