【摘要】 以W-20Cu销/45钢环摩擦副为研究对象,采用改进后的MPV-1500型摩擦磨损试验机,研究了直流磁场对W-20Cu干滑动摩擦磨损特性的影响.利用扫描电镜观察W-20Cu销磨损后的表面形貌、纵切面组织及磨屑形貌,采用三维形貌仪表征了磨损表面粗糙度.结果表明:随着磁场的施加和增大,W-20Cu销和45钢环的磨损率及摩擦系数均有减小趋势.磁场不仅降低了W-20Cu销摩擦面亚表层的变形程度,而且能吸附磨屑并使之细化.无外加磁场时,磨损机制主要为磨粒磨损;施加磁场后,W-20Cu销摩擦面趋于平滑,磨损机制变为磨粒磨损和氧化磨损的混合磨损.更多还原

【Abstract】 The dry sliding friction and wear of W- 20 Cu compacts and 45 steel in the magnetic field was studied by use of a modified MPV- 1500 tribo- tester at room temperature. The worn surface and sub- surface morphology of W- 20 Cu compacts and wear debris were characterized by means of scanning electron microscopy. The three- dimensional characteristic of the wear sample was further studied by using 3- D surface profiler and 3- D surface roughness was calculated and characterized. The results show that,by applying magnetic field and increasing the intensity,the wear rates of the W- 20 Cu and 45 steel and the friction coefficient were reduced. In addition,the degree of deformation of the sub-worn surface was reduced and fine wear debris was observed. The wear mechanism was mainly abrasive wear under non-magnetic field. After applying magnetic field,the wear surface of W- Cu pin became smooth gradually and the wear mechanism included abrasive wear and oxidation wear.更多还原