载流条件下铜-石墨复合材料摩擦学性能研究

来源 :第十一届全国表面工程大会暨第八届全国青年表面工程学术会议 | 被引量 : 0次 | 上传用户:reddhong
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  为了研究载流条件下铜-石墨复合材料/铬青铜摩擦配副在不同条件下的摩擦学性能,本文借助于HST-100高速载流摩擦磨损试验机,研究了不同电流和速度的大小对铜-石墨复合材料摩擦系数和磨损率的影响,利用扫描电子显微镜镜(SEM)和X射线能谱仪(XRD)等对磨损表面进行了表征,并对摩擦表面的形貌进行了观察和分析。结果 表明:电流和速度是影响铜-石墨复合材料载流摩擦磨损性能的重要因素。在速度一定的条件下,随着电流的增大,铜-石墨复合材料的摩擦系数逐渐减小,磨损率逐渐增大,摩擦表面形貌由轻微磨损逐步转变为裂纹和烧溶现象;在电流一定的条件下,材料的摩擦系数随着速度的增大先升高后降低,在40m/s时达到一个峰值,速度的改变对摩擦系数有较大的影响。磨损率呈先增大后减小,然后又呈增加的趋势,在40m/s时磨碎率较低,且材料的磨损机制出现了明显的变化,材料的损伤主要方式逐步由机械损伤向电损伤过渡。
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