大电流对碳滑块/铜银合金接触线载流摩擦磨损性能的影响

摘要

在高速载流摩擦磨损试验机上研究速度为150 km/h、接触压力为60～120 N试验工况下,200～500 A大电流对纯碳滑板摩擦磨损性能的影响.结果表明:在低电压大电流的载流条件下,铜银接触线和纯碳滑板间主要以短弧放电为主,放电面积大、电弧输出能量高;碳滑块的磨损形式主要以电弧烧蚀、剥离、熔融、汽化为主,机械磨损较小;碳滑板的磨损量、电弧能量随着电流的增大而急剧上升;摩擦因数随着电流的增加先增加后减小;当电流不变时弓网间的电弧能量随着接触压力增加呈先增加后减小的趋势,磨损量则随着接触压力的增加而减小.%The effect of low-voltage and high-current on the friction and wear behavior of carbon strip/Cu-Ag alloy contact wire was studied on a high-speed electric sliding test machine under a constant AC and the sliding velocity of 150 km/h and the contact forces from 60 to 120 N.The results show that under the condition of low-voltage and high-current,the main form of arc discharge between carbon strip/Cu-Ag alloy contact wire is short arc discharge with large arc discharge area and high arc energy.The main wear mechanisms of the carbon strip include arc ablation wear,delamination,melting,vaporization and slight mechanical wear.The wear volume of the carbon strip and arc energy is increased sharply with the increasing of the electric current.The friction coefficient is increased first and then decreased with the increasing of electric current.When the current is constant,the arc energy is increased first and then decreased with the increasing of the contact pressure.The wear volume is decreased with the increasing of the contact force.