紫铜/铬青铜摩擦副在干摩擦和水雾条件下的载流摩擦磨损性能研究

在HST-100载流高速摩擦磨损试验机上,对比考察了紫铜/铬青铜摩擦副在干摩擦和水雾2种状态下的载流摩擦磨损性能,采用扫描电镜(SEM)对磨损表面形貌进行了观测。结果表明:水雾条件下销试样载流摩擦磨损时,其摩擦因数及磨损率均低于纯载流状态下;该试样在纯载流条件下的磨损机制主要为粘着磨损和电气磨损,在水雾条件下主要为电弧侵蚀、塑性变形和轻微的粘着磨损。这是因为水有利于降低摩擦副接触表面的温度,有效地抑制了铜的转移,阻止了粘着磨损的发生。水因素的介入也导致了电弧发生频率的增多,但在综合影响下,水可以有效地改善该试样的磨损性能。

Tribological Characteristics of T2/QCr0.5 Rubbing Pairs under Electric Current with and without Water

The friction and wear behavior of T2/QCr0.5 rubbing pairs under electric current with and without water was comparatively investigated with an HST-100 high speed and carry current friction and wear tester.The worn surfaces of the pins were examined by scanning electron microscopic and the wear mechanisms were analyzed.As the results,the friction coefficient and wear rate with water is lower than that under dry sliding with current.The wear mechanism with water is arc erosion,plastic deformation and slight adhesive wear,while it is characterized by adhesive wear and arc erosion under dry sliding with current.The cooling effect of water helps to abate the surface temperature rise and restrain the adhesion and transfer.This contributes to decrease the wear rate.The generation of the frequency of electric arc is increased with water.However,the combined effects of water can effectively improve the wear properties of T2/QCr0.5 rubbing pairs.