Effect of paraffin wax-impregnated on current-carrying friction and wear properties of carbon contact strips
This study investigates the impact of paraffin wax-impregnation 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 wax-impregnated and paraffin wax-unimpregnated-sliding against a copper-silver alloy contact wire were examined under current-carrying 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.Parafin 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(80 km/h)enhances the wear resistance of the carbon contact strips.
metrocurrent-carrying friction and wearparaffin wax-impregnated carbon contact striparc ablationfriction coefficient
万方数据
维普
