目的 研究MoS2/PFPE固液复合润滑体系的摩擦学性能,并通过表征手段分析其磨损与润滑机理,以期获得具有优异摩擦磨损性能的固液复合润滑方式。方法 通过球盘摩擦试验对MoS2/PFPE固液复合润滑体系的摩擦系数进行测试,并与MoS2固体润滑、PFPE油润滑和使用MoS2粉末添加剂改性的PFPE油润滑3种常用润滑体系进行对比。摩擦试验后,通过表面轮廓仪对摩擦副中钢球磨斑的表面进行研究,以分析磨损情况。通过SEM、EDS和拉曼光谱研究摩擦副中试环磨痕表面的微观形貌、元素成分以及分子结构,以分析MoS2/PFPE固液复合润滑体系磨损与润滑的机理。结果 球盘摩擦试验结果显示,相比于MoS2固体润滑,MoS2/PFPE固液复合润滑、PFPE油润滑和使用MoS2粉末添加剂改性的PFPE油润滑的摩擦系数虽然均有所增加,但寿命得到大幅延长,其中MoS2/PFPE固液复合润滑体系的初始摩擦系数较好。摩擦副中钢球表面磨损情况表明,MoS2/PFPE固液复合润滑体系的耐磨性优于另外2种油润滑。SEM、EDS及拉曼光谱分析结果显示,MoS2/PFPE固液复合润滑体系的磨损机理为磨料磨损与黏着磨损的复合机制,其润滑机理为MoS2转移膜和PFPE润滑油共同起到润滑作用的协同润滑。结论 MoS2/PFPE固液复合润滑体系能够大幅延长摩擦副寿命,同时具有较为优异的初始摩擦系数和耐磨性,可为高性能、长寿命的固液复合润滑体系设计提供理论支持与数据参考。
Abstract
In order to acquire a solid-liquid composite lubrication method that exhibits outstanding friction and wear properties, a comprehensive investigation is carried out on the MoS2/PFPE solid-liquid composite lubrication system. Furthermore, a detailed analysis is conducted on its wear and lubricating mechanism, including the actual wear type and lubricating media composition. The friction coefficient of the MoS2/PFPE solid-liquid composite lubrication system is determined through a ball-disk friction test. The friction coefficient test result is compared with three common lubrication systems, which are MoS2 solid lubrication, PFPE oil lubrication, and PFPE oil lubrication modified with MoS2 powder. The test results of the ball-disk friction test show that compared with MoS2 solid lubrication, the friction coefficient of MoS2/PFPE solid-liquid composite lubrication, PFPE oil lubrication, and PFPE oil lubrication modified with MoS2 powder all exhibit an increase. However, the service lives of these three lubrication systems are significantly extended. And the initial friction coefficient of MoS2/PFPE solid-liquid composite lubrication is the lowest among these three lubrication systems. In order to analyze the wear performance after the friction coefficient test, the wear scar surface of the steel ball is studied through a surface profiler. The wear condition of the steel ball indicates that the wear resistance of the MoS2/PFPE solid-liquid composite lubrication system is better than that of the other two kinds of oil lubrication. Friction and wear properties of the MoS2/PFPE solid-liquid composite lubrication system show that it has the best comprehensive tribological performance among all lubrication systems tested. To investigate the wear and lubricating mechanisms of the MoS2/PFPEsolid-liquid composite lubrication system, various microscopic characterizations are carried out, including SEM, EDS and Laman spectrum. SEM images for the wear scar surface of test rings indicate the wear mechanisms of different lubrication systems. The wear type of MoS2 solid lubrication is abrasive wear. PFPE oil lubrication and PFPE oil lubrication modified with MoS2 powder show adhesive wear. The wear mechanism of the MoS2/PFPE solid-liquid composite lubrication system is the composite mechanism of abrasive wear and adhesive wear. EDS elemental analysis indicates the existence of Mo and S, which means there is a MoS2 transfer film at the friction interface of the MoS2/PFPE solid-liquid composite lubrication system. Laman spectrum shows the characteristic absorption of MoS2, which also verifies the existence of the MoS2 transfer film at the friction interface of the MoS2/PFPE solid-liquid composite lubrication system. Microscopic characterization results indicate that the lubricating mechanism of the MoS2/PFPE solid-liquid composite lubrication system is a synergistic lubrication effect of the MoS2 transfer film and PFPE oil. The existence of the MoS2 transfer film is the key reason why the MoS2/PFPE solid-liquid composite lubrication system shows better wear resistance and initial friction coefficient than those of PFPE oil lubrication and PFPE oil lubrication modified with MoS2 powder. To sum up, the MoS2/PFPE solid-liquid composite lubrication system can significantly extend the service life of the friction pair, while having relatively low initial friction coefficient and high wear resistance. This excellent comprehensive tribological performance profits from the co-existence of the MoS2 transfer film and PFPE oil. This article can provide theoretical support and data reference for the design of high-performance and long-life solid-liquid composite lubrication systems.
关键词
二硫化钼 /
全氟聚醚 /
固液复合润滑 /
摩擦学性能 /
磨损机理 /
润滑机理
Key words
MoS2 /
PFPE /
solid-liquid composite lubrication /
tribological performance /
wear mechanism /
lubricating mechanism
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