An experiment is conducted to investigate the role of surface roughness on the coefficient of friction and contact resistance of sliding electrical contacts. A hemispherical pin is sliding along both smooth and rough 2-meter rail surface. Tests are performed at both low and moderate sliding speed and for a range of electrical current densities, ranging from 0 to about 12 GA/m{sup}2. It was found that surface roughness had a significant influence on the coefficient of friction, with the smoother surfaces exhibiting higher coefficients of friction. Contact resistance, on the other hand, did not show as strong an effect of surface roughness, except for a few parameter combinations. At the higher current densities studied (>10 GA/m{sup}2), it was found that the contact resistance values tended to be on the order of 1 mΩ, independent of load, speed and roughness. This convergence may be due to presence of liquid metal film at the interface, which established ideal electrical contact.
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机译：进行实验以研究表面粗糙度对滑动电触头的摩擦系数和接触电阻的作用。半球形销沿光滑和粗糙的2米轨道表面滑动。测试以低和中等的滑动速度和一系列电流密度进行，范围为0至约12Ga / m {sup} 2。发现表面粗糙度对摩擦系数有显着影响，具有表现出更高系数的摩擦系数。另一方面，接触电阻，除了几个参数组合之外，没有显示出表面粗糙度的强烈效果。在研究的较高电流密度（> 10Ga / m {sup} 2），发现接触电阻值趋向于1mΩ的大约，与负载，速度和粗糙度无关。该收敛可能是由于界面处存在液态金属膜的存在，这建立了理想的电接触。
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