MoSi_2/SiC配对副在不同载荷下的高温磨损性能研究  

Wear Behaviors of MoSi_2/SiC under Different Load at High Temperature

作　　者：张厚安[1] 时存[1] 胡小平[1] 张翠娟[1] 

机构地区：[1]湖南科技大学先进材料制备与应用研究所,湖南湘潭411201

出　　处：《稀有金属》2008年第4期429-432,共4页Chinese Journal of Rare Metals

基　　金：国家自然科学基金(50405041);2007年中南大学粉末冶金国家重点实验室开放基金资助项目

摘　　要：在XP-5型高温摩擦磨损试验机上考察了MoSi2/SiC配对副在1000℃不同载荷下的摩擦磨损性能,并用SEM扫描电镜对MoSi2和SiC的磨损表面进行了观察,用X射线分析了MoSi2的磨损表面相组成。结果表明：MoSi2/SiC摩擦副在1000℃高温滑动时,随载荷增大摩擦系数逐渐减小;40 N时MoSi2的磨损率达到极大值;随载荷的增大,MoSi2的主要磨损机制依次表现为粘着、研磨、疲劳断裂和氧化磨损等形式。20-50 N时,SiC出现磨损增重现象,归因于氧化增重作用高于磨损失重作用。The frictional properties of molybdenum disilicide （MoSi2） against SiC under different loads at 1000 ℃ were investigated with XP-5 type High Temperature Friction and Wear Tester. Microphotographs of the worn surface and phase status of MoSi2 were observed and analyzed by means of SEM with EDS and X-ray diffraction method. The results showed that friction coefficient of sliding was reduced gradually with the increase of load for the friction couole of MoSi2/SiC at 1000 ℃. Wear rate of MoSi2 was the ultimate when load was 40 N. With the increase of load, the mechanism of MoSi2 wear changed from the form of adhesion, abrasion to fatigue fracture and oxidation in sequence. When the load was in the range of 20 N to 50 N, the worn weight gain of SiC was increased, since the influence of oxidation on the weight gain was more obvious than that of wear.

关 键 词：二硅化钼 磨损率机制 高温磨损 碳化硅 

分 类 号：TG148[一般工业技术—材料科学与工程] TH117.1[金属学及工艺—金属材料]