(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: 制備粗糙層熱解炭(RL)和光滑層熱解炭(SL)基體的C/C復(fù)合材料，測(cè)試該C/C復(fù)合材料與40Cr鋼配副時(shí)的摩擦磨損行為，并對(duì)磨損表面進(jìn)行SEM觀察。對(duì)比研究高強(qiáng)石墨和光滑層結(jié)構(gòu)的塊狀熱解炭在相同條件下的滑動(dòng)摩擦磨損行為。結(jié)果表明：PAN炭纖維改善C/C復(fù)合材料的摩擦磨損行為；在實(shí)驗(yàn)載荷范圍內(nèi)，與高強(qiáng)度石墨材料相比，含RL炭C/C復(fù)合材料的摩擦因數(shù)降低0.08~0.12；體積磨損量增幅降低;與熱解炭試樣相比，具有SL炭C/C復(fù)合材料的摩擦因數(shù)降低0.02~0.05，體積磨損量低0.2 mm3左右；隨著時(shí)間的延長(zhǎng)，大部分C/C復(fù)合材料的摩擦因數(shù)基本相對(duì)穩(wěn)定或呈小幅下降，而石墨、熱解炭塊的摩擦因數(shù)均呈不同幅度的上升；具有RL炭的C/C復(fù)合材料摩擦表面膜厚度隨載荷增加而降低，具有SL炭的C/C復(fù)合材料摩擦表面較粗糙；高強(qiáng)石墨能形成較完整致密的摩擦膜，但磨粒磨損嚴(yán)重，磨屑易在摩擦膜邊緣形成層狀堆積；熱解炭塊摩擦表面磨屑堆積松散，有較多的孔洞以及熱解炭層整體剝落的形貌。
關(guān)鍵字: C/C復(fù)合材料；炭材料；結(jié)構(gòu)；摩擦；磨損
C/C composites with similar structure
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Two kinds of C/C composites with rough-lamination pyrocarbon matrix (RL) or smooth lamination (SL) pyrocarbon matrix were prepared. The sliding friction behaviors against 40Cr steel ring of the two C/C composites, a high strength graphite and a pyrocarbon solid material with SL structure used as compared material were investigated. The wear surface of the samples were observed by SEM. The results show that the PAN-carbon fiber can improve the frictional stability of C/C composites. Compared with the graphite, the coefficients of friction (COF) of the RL-C/C are lower under the same load of about 0.08−0.12, and the increasing range of the volume losses are still lower than those of the graphite. Compared with the SL pyrocarbon material, the COF and the volume loss of the SL-C/C are about 0.02−0.05 and 0.2 mm3, lower than those under the same load. The COFs of most RL-C/C and SL-C/C specimens remain stable or decrease slightly with time, while those of the graphite and pyrocarbon specimens increase. The thickness of the integrated friction film of the RL-C/C decreases with load, but the wear surface of the SL-C/C is rough. Tough the wear surface of the graphite is integrated, the serious abrasive wear make the debris move easily and accumulate on the edge of the wear trace to form a restacked morphology. On the wear surface of the pyrocarbon material, some loosed debris, circular worn holes and flake worn out pyrocarbon has been found.
Key words: C/C composite; carbon material; structure; friction; wear
