Effect of brush hardness on electrical contact and tribological behavior of Au9Ni against Au35Ag5Cu disc
QU Qiang1, ZHOU Xiong2, LUO Bo2, ZHANG Lei2
1. Beijing Institute of Control Engineering, Beijing 100000, China; 2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Abstract：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 mΩ to 3.37 mΩ 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.
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2019, Vol. 24 
