铜基复合材料受电弓滑板摩擦磨损及电阻率的研究

针对目前受电弓滑板与接触网导线构成的特殊摩擦副存在磨损严重、电弧敏感度高、机械性能较差的缺陷, 研制了一种具有减摩耐高温和导电性能优良的耐热铜基受电弓滑板材料。采用MG-2000型高速高温摩擦磨损试验机, SX1934(SZ-82)数字式四探针测试仪, XJL-03型金相显微镜, JSM-6700F扫描电镜等仪器测试并分析了其热摩擦磨损、电性能及显微组织。结果表明: 添加改性PI树脂在300 ℃环境温度下摩擦60 min平均磨损量和摩擦15 min的摩擦系数分别为4.6×10^-5 g/m和0.112,低于改性前的13.8×10^-5 g/m和0.114, 而且电阻率为3.3 μΩ·m, 要小于同类复合材料电阻率(10 μΩ·m)。

Frictional Wear and Resistivity of Copper Matrix Composites Pantograph Slider

In allusion to the heavy wear, high arc sensitivity and low mechanical character of special friction assistant composed of pantograph slider and contact wire at present, a new heat resisting copper matrix composites pantograph slider material was developed, which is of anti-friction, resistance to elevated temperature and excellent conductance. The frictional wear, electric property and microscopic structure were investigated by a MG-2000 high temperature and speed friction wear testing machine, SX1934(SZ-82)four-point testing instrument, XJL-03 metallographic microscope, JSM-6700F SEM. Results show that at the environmental temperature of 300 ℃, average wear of 60-minute-friction and friction coefficient of 15-minute-friction are 4.6×10^-5 g/m and 0.112 respectively, which are lower than that of the untreated materials, i.e. 13.8×10^-5 g/m and 0.114. Moreover, the electrical resistivity is 3.3 μΩ·m, which is lower than that of the complex materials (10 μΩ·m).