电流对载流摩擦副材料损伤行为的影响

Effects of Electricity on Material Damage of Current-carrying Frictional Pairs

载流摩擦过程中材料的损伤行为是影响载流摩擦副寿命的关键。采用纯铜与QCr0.5配副,研究纯铜材料的载流磨损行为。结果表明,载流条件下磨损行为仍然包括无电条件下的主要磨损行为;电流的介入导致磨损行为发生变化,在载荷50 N、滑动速度10 m/s条件下,电流从0增加到50 A时表面温度增加5.6-7.2倍;且摩擦表面严重粗糙化,发生剧烈不均匀塑性变形,在载荷70 N、滑动速度20 m/s、电流60 A条件下,其变形层厚度约180μm;电流还直接导致材料的损伤,主要包括熔融和喷溅。

The material damage during triboelectric process could obviously affect the life of current-carrying frictional pairs. The triboelectric behaviors of pure copper were investigated by using pure copper as pin samples and the QCrO. 5 as disk sample. In addition to the main wear behaviors in normal dry sliding, the results reveal that the electricity results in some special wear behaviors during current-carrying sliding. For instance, the surface temperature is increased by 5.6- 7. 2 times at the load of 570 N, the sliding speed of 10 m/s, and the electricity from 0 to 60 A, the surface becomes seri- ously rough, and there is an inhomogeneous plastic layer on the subsurface, the thickness of which is about 180 μm at the load of 70 N, the sliding speed of 20 m/s, and the electricity of 60 A.The electricity directly causes the material damage, which mainly contains sputtering and melting.