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选用MRH-5A型环-块摩擦磨损试验机测定了3种载荷和2种转速条件下La2O3和WSi2增强MoSi2基复合材料在滑动干摩擦时的摩擦磨损性能,采用扫描电子显微镜分析了复合材料磨损表面形貌.结果表明:La2O3和WSi2增强MoSi2基复合材料的抗磨性能优于MoSi2及WSi2/MoSi2材料;当载荷与速度乘积(pv)值小于183.04N·m/s时,La2O3和WSi2增强MoSi2基复合材料的磨损质量损失仅为相同条件下MoSi2的1/4～1/6和WSi2/MoSi2的1/2;这是由于La2O3和WSi2复合增强相存在硬化和韧化协同作用所致;随着pv值增加,La2O3和WSi2增强MoSi2基复合材料依次呈现犁削、粘着磨损和疲劳磨损特征.
The friction and wear properties of MoSi2-based composites reinforced with La2O3 and WSi2 under three kinds of loadings and two rotation speeds were tested by MRH-5A ring-block friction and wear tester. The wear and tear of the composites was analyzed by scanning electron microscopy The results show that La2O3 and WSi2 reinforced MoSi2-based composites have better wear resistance than MoSi2 and WSi2 / MoSi2. La2O3 and WSi2 are enhanced when the product of load and speed is less than 183.04N · m / s The wear loss of MoSi2-based composites is only 1/4 ~ 1/6 of that of MoSi2 and ½ of that of WSi2 / MoSi2 under the same conditions. This is attributed to the synergistic effect of hardening and toughening of La2O3 and WSi2. With the increase of pv value, La2O3 and WSi2 reinforced MoSi2 matrix composites showed the characteristics of plow, adhesive wear and fatigue wear in turn.