中文摘要：

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。

英文摘要：

The friction and wear behavior of La203-MoSi2 composite-SiC friction couples at 1 000 ℃ and under a load of 30 N at different sliding speeds were investigated via a mode XP-5 high temperature friction and wear testing machine. The worn surfaces and phase composition of those materials were analyzed by scanning electron microscope and X-ray diffraction, respectively. The results showed that the friction factor of La2O3-MoSi2-SiC friction couples decreased with the increase of sliding speed. The wear rate of La2O3-MoSi2 composite was greatest at a sliding speed of 0.084 m/s, and the lowest at 0.126 m/s. The wear mechanisms of LazO3-MoSi2 composite involved oxidation, adhesion wear, abrasion and fatigue pitting. The wear rate of SiC decreased with the increase of sliding speed, indicating a wear phenomenon of mass gain during the wear process due to the mass gain oxidation rather than the mass wear loss.