环境湿度对碳/铜滑动接触副载流摩擦学行为的影响

弓网系统依靠受电弓滑板与接触网导线间的滑动电接触为电力列车输送电能，作为1个开放的摩擦学系统，外界环境对其服役行为具有显著影响. 本文中利用往复式载流摩擦磨损试验机，通过加装湿度控制模块，在滑动电接触条件下，以碳棒和铜棒为摩擦配副，研究了环境湿度对碳/铜载流滑动接触副摩擦学行为的影响. 结果表明：载流条件下的摩擦系数高于无电流工况；无电流工况下，平均摩擦系数均随环境湿度的增加而单调降低；但由于累积电弧放电能量、平均接触电阻与相对湿度的正相关性，导致载流条件下在35% RH后的摩擦系数几乎不受环境湿度的影响. 进一步发现，无电流工况下，碳棒上的黏着磨损和氧化磨损随相对湿度的增加逐步减缓，载流工况下，存在1个黏着磨损程度最低的最佳湿度值，出现在55% RH附近. 高湿环境下，加速了碳/铜载流滑动过程中碳棒磨损表面分子结构的变化.

The catenary-pantograph system supplies electric energy to electric trains via the sliding electrical contact between the pantograph slider and the catenary wire. As an open tribological system, its service performance is significantly affected by the external environment. In this study, a reciprocating current-carrying friction and wear testing machine equipped with a humidity control module was used to investigate the effect of environmental humidity on the tribological behavior of carbon/copper current-carrying sliding contact pairs, with carbon rods and copper rods as the friction pairs under sliding electrical contact conditions. The results show that the coefficient of friction (COF) under current-carrying conditions is higher than that under non-current-carrying conditions; under non-current-carrying conditions, the average COF decreases monotonically with increasing environmental humidity. However, due to the positive correlation among cumulative arc discharge energy, average contact resistance and relative humidity, the COF under current-carrying conditions shows almost no dependence on environmental humidity after 35% RH. Further findings reveal that under non-current-carrying conditions, the adhesive wear and oxidative wear on the carbon rods gradually alleviate with increasing relative humidity, while under current-carrying conditions, there exists an optimal humidity level with the lowest degree of adhesive wear, which appears near 55% RH. In high-humidity environments, the changes in the molecular structure of the worn surface of carbon rods during the current-carrying sliding process of the carbon/copper pairs are accelerated.

搜集汇总

背景与挑战

背景概述

该数据集研究了环境湿度对碳/铜滑动接触副在载流条件下的摩擦学行为影响，聚焦于弓网系统应用。通过实验发现，载流工况下摩擦系数高于无电流情况，且湿度变化对摩擦系数和磨损机制有不同影响，例如无电流时摩擦系数随湿度增加降低，而载流时在35%相对湿度后影响较小。数据集提供了摩擦系数、接触电阻和磨损机制等关键参数，有助于理解湿度在电力列车滑动电接触中的作用。