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滑动速率对La2O3–MoSi2与SiC摩擦副的高温摩擦磨损行为的影响

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Abstract:

在XP-5高温摩擦磨损试验机上考察了La2O3–MoSi2与SiC摩擦副在1000℃、30N载荷以及不同滑动速率下的摩擦磨损行为。利用扫描电子显微镜和X射线衍射仪分析了La2O3–MoSi2复合材料和SiC的磨损表面形貌与相组成。结果表明La2O3–MoSi2与SiC摩擦副的摩擦因数随滑动速率的增加而减小,在滑动速率为0.084m/s时,La2O3–MoSi2复合材料磨损率最大;0.126m/s时磨损率最小。其磨损机理除氧化磨损之外,还表现为黏着磨损、研磨和疲劳点蚀。SiC的磨损率随滑动速率的增加而减小,始终表现为磨损质量增加,这归因于氧化质量增加大于磨损质量损失

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