钒铬表面复合层的干滑动摩擦磨损性能

Dry Sliding Friction Wear Properties of Vanadium-Chromium Surface Composite Layer

采用消失模铸渗的方法在铸钢件表面制备了钒铬复合层,用MM200型摩擦磨损试验机研究了不同渗剂成分试样的干滑动摩擦磨损性能,并用扫描电镜观察了试样的磨损形貌,分析了复合材料的磨损机理。结果表明:与基体材料相比,复合层的耐磨性显著提高,其最大磨损率仅是基体材料的1/8;随着载荷的增大和渗剂中钒铁含量的减少,表面复合层的磨损率提高;表面复合层的磨损机理主要是氧化磨损和裂纹的形成、扩展所造成疲劳剥落。

Vanadium-Chromium composite layer was formed on the surface of cast steel by the V-EPC casting penetration. The dry sliding friction and wear properties of the composite layer were studied on MM200 friction wear testing machine. The feature of wear surface was observed by SEM, and the wear mechanism of samples was analyzed. The results show that the wear resistance of the composite layer is evidently advanced comparing with that of the matrix. The wear rate of composite layer is only eighth to that of the matrix. With the increase of load and the decrease of Vanadium iron in the penetrating agent, the wear rate of the composite layer is increased. The wear mechanism of the composite layer is mainly oxidation and fatigue flake produced by the initiation and expansion of crack.