浸石蜡对碳滑板载流摩擦磨损性能影响研究  

Effect of paraffin wax-impregnated on current-carrying friction and wear properties of carbon contact strips

作　　者：刘崧楠 华浩 陈光雄[1] 张峻才 常勇 唐宇 LIU Songnan;HUA Hao;CHEN Guangxiong;ZHANG Juncai;CHANG Yong;TANG Yu(Tribology Research Institute,Southwest Jiaotong University,Chengdu Sichuan 610031,China)

机构地区：[1]西南交通大学摩擦学研究所,四川成都610031

出　　处：《现代城市轨道交通》2024年第2期124-131,共8页Modern Urban Transit

摘　　要：为研究在载流条件下浸石蜡对碳滑板摩擦磨损性能的影响,在环-块载流摩擦磨损试验台上试验浸石蜡、未浸石蜡2种纯碳滑板与铜银合金接触线在载流条件下的摩擦磨损性能,并对比碳滑板在不同载荷、滑动速度、电流情况下的表面形貌变化。试验结果显示,浸石蜡对碳滑板载流摩擦磨损性能的影响与电弧烧蚀紧密相关。石蜡及其有机产物加剧电弧烧蚀,石蜡的不完全分解会削弱滑板的载流摩擦磨损性能,通过减小法向载荷、加快滑动速度、增大电流均能显著加剧浸石蜡碳滑板在试验中的电弧烧蚀。浸石蜡碳滑板的摩擦系数的变化规律是:随法向载荷、电流的增大呈现减小的趋势,随滑动速度的增加先增大后减小,60km/h时摩擦系数最大;浸石蜡碳滑板的平均电弧能量、磨耗量随法向载荷的增大呈现减少的趋势,随电流的增大而增加,平均电弧能量随滑动速度的增加而增大,磨耗量随滑动速度的增加先增加后减少,60km/h时磨耗量最大;在低速(40km/h)和高速(80km/h)时浸石蜡增强碳滑板的耐磨性能。This study investigates the impact of paraffin waximpregnation on the friction and wear characteristics of carbon contact strips under current-carrying conditions. The friction and wear properties of two pure carbon contact strips-paraffin waximpregnated and paraffin wax-unimpregnated-sliding against a copper-silver alloy contact wire were examined under currentcarrying conditions using a ring-block current-carrying friction and wear test bench. The surface morphology changes of the carbon contact strips under different loads, sliding velocities,and currents were then compared. The results indicate a close correlation between the effect of paraffin wax-impregnation and the current-carrying friction and wear performance of the carbon contact strips, particularly concerning arc ablation. Paraffin wax and its organic products were found to exacerbate arc ablation,and the incomplete decomposition of paraffin weakened the current-carrying friction and wear performance of the strips.Moreover, reducing the normal load, accelerating the sliding speed, and increasing the current can significantly aggravate the arc ablation of the paraffin wax-impregnated carbon contact strips. The friction coefficient exhibits a decreasing trend with an increase in normal load and current. Regarding sliding speed, the coefficient initially rises, then declines, reaching its maximum at 60 km/h. The average arc energy and wear consumption of paraffin wax-impregnated carbon contact strips decrease with increasing normal load and increase with increasing current.Additionally, the average arc energy rises with increasing sliding speed, whereas the wear consumption first increases and then decreases with increasing sliding speed, peaking at 60 km/h.Paraffin immersion at low speeds(40 km/h) and high speeds(80km/h) enhances the wear resistance of the carbon contact strips.

关 键 词：地铁 载流摩擦磨损 浸石蜡碳滑板 电弧烧蚀 摩擦系数 

分 类 号：TH117[机械工程—机械设计及理论]