在电磨损条件下 ,研究了压力变化 (7 5～ 30N/cm2 )对碳纤维 铜 石墨复合材料接触电压降的影响 ,结果表明 ,电磨损初期 ,接触电压降随磨损时间的延长而增加 ;随着压力的增加 ,复合材料接触电压降下降 ,但压力超过一定值后 ,接触电压降变化不大。分析了接触电压降的变化机理 The effect of pressure on the contact voltage drop of carbon fiber-graphite composites was investigated under electric wear conditions. The results show that the contact voltage drop increases with the wear time at the initial stage of electric wear. Pressure increases, the contact voltage drop composite materials decreased, but the pressure exceeds a certain value, the contact voltage drop changed little. The change mechanism of contact voltage drop is analyzed