刚性接触网中浸金属碳滑板在不同法向载荷下的载流摩擦磨损性能

为了更好地模拟浸金属碳滑板的实际应用工况，设置试验滑动距离为1 000 km,使用环-块式载流摩擦磨损试验机模拟地铁列车在刚性接触网系统中的运行条件，研究浸金属碳滑板在不同法向载荷作用下的载流摩擦磨损性能。试验结果表明：随着法向载荷的增大，摩擦因数不断增大，电弧能量下降，载流效率不断升高，滑板的温度以及磨损率都呈现出下降的趋势；随着滑动距离的增加，滑板的磨损率逐渐降低最后趋于稳定。SEM电镜观察结果表明：法向载荷较低时，浸金属碳滑板表面产生了较多烧蚀坑和裂纹，其磨损形式主要表现为电弧烧蚀以及片状剥落；随着法向载荷增大，滑板表面出现划痕和磨屑，磨粒磨损现象较为明显。研究表明：适当增大法向载荷可以有效抑制电弧的烧蚀作用，减少滑板表面的裂纹和烧蚀坑，从而降低滑板的磨损。

Friction and Wear Performance of Metal-impregnated Carbon Strips Against a Rigid Catenary under Different Normal Force

In order to better simulate the actual application conditions of metal-impregnated carbon strip,the test sliding distance was set at 1 000 km,the block-on-ring high-speed friction and wear tester was used to simulate the operating conditions of the subway train in the rigid catenary system to study the current-carrying friction and wear performance of metal-impregnated carbon strips against a rigid catenary under different normal force.The results show that as the normal force increases,the average friction coefficient and current-carrying efficiency increase,the arc energy decreases,and the temperature and wear rate of the metal-impregnated carbon strip show a downward trend.With the increase of the sliding distance,the wear rate of the strips decreases first and then trends to be stable.The results of SEM observation on the strip scars show that when the normal force is low,there are more ablation pits and cracks on the strip surfaces,and the wear mechanism of the strips is dominated by arc ablation and layered spalling.when the normal force is high,scratches and wear debris appear on the surface of the strips,and the abrasive wear is more obvious.It can be concluded that properly increasing the normal force can effectively restrain the arc ablation,reduce the surface cracks and ablation pits of the strip,and thus reduce the wear of the strip.