(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: 從界面角度出發(fā)，研究銅基粉末冶金摩擦材料中不同特征摩擦組元與基體組元形成的界面，并深層次探討界面與摩擦表面、亞表面結(jié)構(gòu)、摩擦磨損性能及磨損機(jī)理之間的關(guān)系。結(jié)果表明：SiC分別與基體Cu和Fe形成結(jié)合較差的機(jī)械結(jié)合界面和反應(yīng)結(jié)合界面，高碳鉻鐵(HCC)與基體Cu形成擴(kuò)散-機(jī)械結(jié)合界面；SiC與HCC均與基體形成含缺陷界面，而裂紋易沿界面缺陷形核擴(kuò)展，使材料發(fā)生剝層磨損，促進(jìn)機(jī)械混合層(MML)形成。而SiO2與銅基體形成緊密機(jī)械結(jié)合界面，使得材料表層SiO2受摩擦力及正壓力的反復(fù)作用發(fā)生破碎剝落，從而導(dǎo)致嚴(yán)重犁削磨損。
關(guān)鍵字: 界面；摩擦組元；摩擦材料；粉末冶金；機(jī)理
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:From the view of interface, the effects of interface formed between friction components and Cu matrix on friction and wear mechanism and the relationships among the microstructure of friction surface or sub-surface, friction and wear mechanism of copper matrix composite prepared by powder metallurgy method were investigated. The results show that the reaction bonding interface and mechanical bonding interface form between SiC/Cu and SiC/Fe matrix interface, respectively. The mechanical-diffuse bonding interface forms between high-carbon chromite(HCC) and Cu matrix. The defect of both interfaces lends to the development of crack which takes responsibility for occurrence of delamination and promotes the formation of the mechanical mixed layer(MML). The complete mechanical bonding interface forms between SiO2/Cu matrix. However, fragile SiO2 broken by repeated pressure is the main reason that the severe plough appears on the friction surface.
Key words: interface; friction component; friction material; powder metallurgy; wear mechanism
