(中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 采用粉末冶金方法制备铜基摩擦材料，研究SiC 含量对材料摩擦磨损性能的影响，探讨材料摩擦表面和亚表面的演变规律，揭示材料的摩擦磨损机理。结果表明：不含SiC 材料的摩擦表面出现大量凹坑，磨损严重，磨损机理以黏着磨损为主；当SiC 含量低于6%(质量分数)时，材料表面出现较多凹坑及浅犁沟，继续提高SiC 含量，凹坑数量减少直至消失，材料表面犁沟的深度及宽度增加，表面及亚表面出现裂纹，材料主要磨损机理由黏着磨损和轻微犁削磨损向剥层磨损和严重犁削磨损转变。
关键字: 摩擦材料；粉末冶金；表面形貌；磨损机理
（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
