(中南大學(xué) 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 采用無壓熔滲工藝制備一種新型的具有自潤滑耐磨性能的炭纖維整體織物/炭−銅(C/C-Cu)復(fù)合材料，在改裝的MM−2000型環(huán)−塊摩擦磨損試驗機上考察其載流摩擦磨損性能，利用掃描電子顯微鏡觀察分析磨損的表面形貌，研究不同載荷和電流強度下復(fù)合材料磨損表面的變化規(guī)律。結(jié)果表明：C/C-Cu復(fù)合材料的體積磨損率隨電流強度和載荷的增大而增大；摩擦因數(shù)變化呈單峰曲線，隨電流強度的增大先升高后降低；載荷為30和70 N，摩擦因數(shù)的峰值出現(xiàn)在10 A；載荷為50 N，摩擦因數(shù)的峰值出現(xiàn)在5 A，這與摩擦面粗糙程度有關(guān)；電流引發(fā)的摩擦面高溫是造成對偶表面熔融的重要原因。
關(guān)鍵字: C/C-Cu復(fù)合材料；熔滲；滑動磨損性能；加載電流
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:A novel C/C-Cu composite with excellent wear resistance was fabricated by infiltrating molten Cu alloy into C/C preforms. The tribological behavior of the composite block with Cu ring counterpart was evaluated using an MM−2000 friction and wear tester. The worn surface morphologies of the composite blocks and Cu rings were analyzed by scanning electron microscopy. The influences of load and electric current on the tribological behavior of the composites were investigated. The results show that the wear rate of the composites increases with increasing load and electric current. The friction coefficient increases firstly and then drops with rising electric current, following a single peak curve. The peaks of 30 and 70 N appear in 10 A, while that of 50 N appears in 5 A. This may be related to surface toughness. The electric heat on the frictional surface might be the main reason for melting surface on Cu ring counterpart.
Key words: C/C-Cu composites; infiltration; sliding wear properties; electric current
