用UMT-2M摩擦试验机,测试了升温和降温(22～600℃)条件下,在Si3N4陶瓷球/GH126镍基高温合金盘间添加高铼酸钳粉末前后的摩擦系数.利用X射线衍射(XRD)和扫捕电镜(SEM)对磨屑成分和磨痕形貌进行了分析,并用UMT附带装置测量了磨痕表面与金属球间的接触电阻.结果表明:升/降温条件下高铼酸铅都具有良好的减摩作用,摩擦系数较未加润滑剂的试验明显降低.这是由于在摩擦表面形成了完整的减摩膜.尤其是600℃时高铼酸铅熔化,形成易于流动的熔融态减摩膜,使摩擦系数达最低值,且良好的减磨作用可以一直持续到22℃.
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