(中南大學 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 通過粉末層鋪法向全網(wǎng)胎炭纖維預制體中添加六方氮化硼粉末和化學氣相沉積熱解炭增密制備C/C-BN復合材料。在MM−1000摩擦試驗機上對其摩擦磨損性能進行測試，并對摩擦表面進行光學形貌觀察以及對材料的組織結(jié)構(gòu)和磨屑進行SEM形貌觀察。結(jié)果表明：與C/C復合材料相比，C/C-BN復合材料的線性磨損率降低了40%，質(zhì)量磨損率降低了70%；摩擦表面中的六方BN在摩擦過程中始終保持穩(wěn)定，BN的存在使光滑層熱解炭結(jié)構(gòu)的C/C復合材料的摩擦因數(shù)曲線變得平穩(wěn)、波動小并且對剎車壓力響應迅速，摩擦表面上形成了一層薄的摩擦膜。
關(guān)鍵字: C/C復合材料；BN；摩擦磨損；摩擦表面；磨屑
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The carbon fiber reinforced/carbon-boron nitride (C/C-BN) hybrid matrix composites were prepared by adding hexagonal boron nitride (h-BN) powders in preform and subsequent chemical vapor infiltration (CVI) process. Friction and wear properties of C/C-BN were investigated on an MM−1000 testing machine. The morphologies of wear surfaces were observed by optical microscope. The morphologies of wear debris and the microstructures of samples were analyzed by scanning electron microscope. The results show that the C/C-BN composites display linear wear rate 40% lower and mass wear loss 70% lower than those of C/C composites. The h-BN in the matrix always keeps stable. The addition of BN in the matrix can effectively improve the stability of friction curves of C/C composites with a SL pyrolytic carbon texture, and cause the formation of a thin wear film on the wear surface.
Key words: C/C composites; BN; friction and wear; wear surface; wear debris
