重载顶推装备滑动副的摩擦磨损机理

Friction and Wear Mechanism of Sliding Pairs for Incremental Launching Equipment

摘要:

为了研究重载顶推装备滑动副的摩擦磨损性能，提出一种可以模拟重载顶推装备顶推过程的试验台，研究以聚四氟乙烯（PTFE）/丙烯腈-丁二烯-苯乙烯（ABS）/二硫化钼（MoS₂）复合材料和0Cr18Ni9不锈钢组成的滑动副在不同载荷且无润滑工况下，摩擦因数变化趋势并揭示摩擦副的磨损机理。利用扫描电子显微镜（SEM）和能谱仪（EDS）对滑动副磨损后的表面微观形貌和化学成分进行分析。研究结果表明：随着滑动次数的增加，滑动副摩擦因数呈先增大后减小，最后趋于稳定的变化趋势。重载下滑动副摩擦因数初始值高于轻载下摩擦因数，但最终稳定值低于轻载下摩擦因数。轻载下主要磨损机制表现为磨粒磨损和黏着磨损；而重载下主要磨损机制表现为黏着磨损和疲劳磨损。

关键词:磨损机制;摩擦因数;重载顶推装备滑动副;复合材料;0Cr18Ni9不锈钢

Abstract:

In order to study the friction and wear performance of sliding pair of incremental launching equipment， a wear test-bed which can simulate the working process of incremental launching equipment is proposed. Tribological tests for the sliding pair composed of acrylonitrile butadiene styrene （ABS） and molybdenum disulfide （MoS₂） reinforced polytetrafluorethylene （PTFE） and 0Cr18Ni9 stainless-steel were conducted on the wear test-bed. At different loads without lubrication， the variation of friction coefficient of friction pair was discussed and the wear mechanism of the friction pair was revealed. The microscopic and chemical composition of the worn surface for the sliding pairs were discussed by using scanning electron microscope （SEM） and energy dispersive spectrometer （EDS）. The results show that， with the increase of sliding times， the friction coefficient of the sliding pair first increases， then decreases， and finally stabileizes. Moreover， the initial value of friction coefficient at heavy load is larger than that at light load， but the final stable value is smaller than that at light load. At light load， the main wear mechanism is abrasive wear and adhesive wear. However， at heavy load， the main wear mechanism is adhesive wear and fatigue wear.

Key words:wear mechanism;coefficient of friction;sliding pair of incremental launching equipment;composite;0Cr18Ni9 stainless-steel