刷丝硬度对Au9Ni/Au35Ag5Cu对偶电接触及摩擦磨损行为的影响

Effect of brush hardness on electrical contact and tribological behavior of Au9Ni against Au35Ag5Cu disc

选用硬度分别为230.51,251.93和270.30HV的三种Au9Ni合金丝材为研究对象,探究丝材硬度对大气环境下Au9Ni/Au35Ag5Cu对偶电接触稳定性及摩擦磨损行为的影响规律,并揭示Au9Ni丝的磨损机理。结果表明:随Au9Ni丝材硬度由230.51HV增加至270.30HV,材料的摩擦因数和接触压降分别从0.82,46.42mV提高至1.02,98.72mV,同时,其硬度上升减弱了滑动过程中的跃动现象,使其电噪声RRMS从6.15mΩ降至3.37mΩ,从而导致摩擦因数曲线平稳性和接触的稳定性上升;电刷硬度越大,磨损表面粗糙度Ra从1.10μm降至0.57μm,对偶盘的材料转移现象加剧,进而导致其磨损形式由硬度230.51HV时的粘着磨损向粘着-犁削复合磨损机制转变,且犁削磨损对导电滑环的影响随Au9Ni硬度的增加而增大。

The Au9Ni alloy wires with hardness of 230.51, 251.93 and 270.30 HV were used as the research objects. The current-carrying wear mechanism of the Au9Ni alloy wire was studied, and the relationship between hardness and its current-carrying friction and wear behavior has also been explored in atmospheric. The results show that the brush hardness has an important influence on their tribological properties of the atmospheric current. As the brush hardness increased from 230.51 HV to 270.30 HV, the average friction coefficient and contact voltage drop of the material increased from 0.82, 46.42 mV to 1.02, 98.72 mV, respectively, and during the friction period, bouncing is weakend by increased hardness the electrical noise (RRMS) decrease from 6.15 m to 3.37 m that means the curve of friction and contact stability were improved. With the increase of hardness, the roughness of worn surface (Ra) decrease from 1.10 μm to 0.57 μm the wear mechanism of brush with hardness of 230.51 HV is mainly adhesive wear. As the brush hardness increases, the wear mechanism gradually evolves into a composite wear mechanism with adhesive wear and abrasive wear.