【摘要】 采用机械合金化后冷压成型和放电等离子烧结两种不同工艺分别制备铜-石墨复合材料,在销盘式实验机上进行材料的摩擦实验,并通过扫描电镜、X射线光电子能谱仪(XPS)分析摩擦表面的形貌和化学性质。结果表明:随着石墨含量的增加,复合材料的摩擦系数与磨损率显著下降;随烧结温度的升高,摩擦系数与磨损率都呈下降趋势。摩擦系数与磨损率的显著改善是由于在磨损过程中形成一层覆盖表面的润滑膜。当形成的润滑膜几乎覆盖住整个磨损表面时,该润滑膜能够抑制滑动界面处金属与金属接触,使摩擦磨损特性得以改善。更多还原

【Abstract】 Copper-graphite composites were fabricated by spark plasma sintering(SPS) and cold-pressed(CP) processing using a mixture of copper and graphite powders mechanically alloyed.Pin-on-disc wear was used to evaluate the tribological behavior of copper-graphite composites.The results show that the coefficient of friction and wear rate decreased considerably with increasing graphite content;with increasing the sintering temperature,the coefficient of friction and wear rate just decreased in the same way.XPS analysis of worn surface indicated that better tribological properties are due to a lubricious film covering almost entire worn surface.The presence of this tribolayer improves the friction and wear characteristics because when the tribolayer covers almost entire wear surface it effectively restricts metal to metal contact between pin and disc.更多还原