(中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 在預(yù)制體炭纖維預(yù)石墨化前對(duì)其進(jìn)行硼酸處理，研究硼酸對(duì)炭纖維性能，C/C復(fù)合材料導(dǎo)熱率的影響及其作用機(jī)理。結(jié)果表明：硼酸通過(guò)高溫?zé)崽幚磉^(guò)程所分解的硼對(duì)炭纖維起到了有效的催化石墨化作用，顯著提高炭纖維的石墨化性能，改善炭纖維的表面狀態(tài)，從而有效地促進(jìn)CVI過(guò)程中炭纖維表面沉積較高織構(gòu)熱解炭。通過(guò)對(duì)炭纖維以及熱解炭微觀炭結(jié)構(gòu)的調(diào)整，硼酸的添加可有效地提高C/C復(fù)合材料的導(dǎo)熱性能。
關(guān)鍵字: C/C復(fù)合材料；硼酸；催化石墨化；導(dǎo)熱
（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
