中文摘要：

运用M-200型摩擦磨损试验机测定了油润滑条件下MoSi2与45调质钢、45淬火钢和CrWMn钢配对时的摩擦磨损性能，采用扫描电镜和微探针分析了摩擦副表面的形貌，探讨了磨损机理：结果表明：采用20号机械油润滑可有效地降低MoSi2材料的磨损率及摩擦因数；与低硬度的45调质钢和45淬火钢对摩时，MoSi2材料的主要磨损机制为晶间断裂、疲劳断裂、轻微粘着磨损和磨粒磨损；MoSi2材料与高硬度的CrWMn钢对摩时，主要磨损机制表现为粘着磨损、微犁削式磨粒磨损，并在偶件表面材料凸点的前端形成楔块。

英文摘要：

The friction and wear properties of three MoSi2/alloy steel couples： MoSi2/45 tempering steel, MoSi2/45 quenching steel and MoSi2/CrWMn steel, under oil lubrication were investigated by using an M-200 type friction and wear tester. SEM equipment with microprobe was employed to analyze the morphology of the friction surface in order to reveal wear mechanism of MoSi2. Results show that the wear rate of MoSi2 is obviously decreased by oil lubrication and the three friction couples have much excellent friction and wear properties under 150N. In this experiment, the wear rate of 45 tempering steel and 45 quenching steel under oil lubrication are much bigger than that under dry friction, but to CrWMn steel, the increase of wear rate is much small. According to the characteristics of the opponents, the dominant wear mechanism of MoSi2 under oil lubrication is different. When against 45 tempering steel with the lowest hardness, the wear mechanism of MoSi2 changes from intercrystalline fracture under 50N, fatigue fracture under 80N to mild adhesive wears under 150N. When against 45 quenching steel with the middle hardness, the wear mechanism of MoSi2 is mainly adhesive wear. However, when against CrWMn steel with the highest hardness, the wear mechanism is transferred from adhesive wear under 50N to mild micro-plough under 150N, meanwhile, the wedge on the protruding tops of surface of CrWMn steel is formed.