(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: 采用粉末冶金方法制備銅基摩擦材料，研究SiC 含量對(duì)材料摩擦磨損性能的影響，探討材料摩擦表面和亞表面的演變規(guī)律，揭示材料的摩擦磨損機(jī)理。結(jié)果表明：不含SiC 材料的摩擦表面出現(xiàn)大量凹坑，磨損嚴(yán)重，磨損機(jī)理以黏著磨損為主；當(dāng)SiC 含量低于6%(質(zhì)量分?jǐn)?shù))時(shí)，材料表面出現(xiàn)較多凹坑及淺犁溝，繼續(xù)提高SiC 含量，凹坑數(shù)量減少直至消失，材料表面犁溝的深度及寬度增加，表面及亞表面出現(xiàn)裂紋，材料主要磨損機(jī)理由黏著磨損和輕微犁削磨損向剝層磨損和嚴(yán)重犁削磨損轉(zhuǎn)變。
關(guān)鍵字: 摩擦材料；粉末冶金；表面形貌；磨損機(jī)理
（State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China）
Abstract:The effects of SiC content on friction and wear properties,the microstructure evolution of friction surface and sub-surface were investigated. The wear mechanism of copper matrix composite prepared by powder metallurgy method was revealed. The experimental results show that the friction surface displays a rough morphology with a number of wide hollows when the material does not contain SiC,which means that severe adhesion is the dominant wear mechanism. When SiC content is less than 6% (mass fraction),many narrow furrows along with some shallow hollows appear on the friction surface of the material. When SiC content is more than 6%,the hollows decrease and even disappear with the increase of SiC content. The furrows become wider and deeper,and the cracks form on the surface and the sub-surface. The wear mechanism changes from adhesion wear and mild ploughing wear to delamination and severe ploughing wear.
Key words: friction material; powder metallurgy; surface topography; wear mechanism
