(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: 以低密度的C/C復(fù)合坯體為預(yù)制體，分別采用反應(yīng)熔滲(RMI)、化學(xué)氣相沉積(CVD)、浸漬−原位反應(yīng)技術(shù)對(duì)其進(jìn)行陶瓷改性。結(jié)果表明：改性陶瓷分別以SiC和c-BN的形式滲入C/C復(fù)合坯體內(nèi)。摩擦試驗(yàn)結(jié)果表明：采用RMI技術(shù)制備的C/C-SiC復(fù)合材料摩擦因數(shù)較高，高達(dá)0.3到0.9；采用CVD技術(shù)制備的C/C-SiC復(fù)合材料的摩擦因數(shù)在0.20~0.36之間；而采用浸漬−原位反應(yīng)技術(shù)制備的c-BN改性C/C復(fù)合材料的摩擦因數(shù)較低，為0.10~0.20。SEM觀察表明：采用RMI技術(shù)制備的C/C復(fù)合材料的摩擦表面粗糙、未形成完整的摩擦膜，而采用另兩種技術(shù)制備的C/C復(fù)合材料均形成了較完整、致密的摩擦膜。
關(guān)鍵字: C/C復(fù)合坯體；碳化硅；氮化硼；摩擦磨損
wear properties
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The low density C/C composites were modified by B and Si using reaction melt infiltration (RMI), chemical vapour deposition (CVD) and impregnation and in-situ reaction. The results show that the modified ceramics are successfully added in the matrix carbon as SiC or c-BN. The C/C-SiC modified by RMI has high friction coefficient which reaches 0.30−0.90. The friction coefficient of C/C-SiC modified by CVD changes in 0.20−0.36, while the composites modified by c-BN using impregnation and in-situ reaction hold the lowest friction coefficient, which is 0.10−0.20. The wear surfaces of the RMI-modified composites are very rough without any integrated friction film, while the wear surfaces of the other two composites are compacted and integrated.
Key words: C/C composites; SiC; boron nitride; friction and wear
