结果表明：在电磨损初期接触电压降较小，随着时间延长，接触电压降上升并趋于稳定；
The contact voltage drop was low in the initial stage of wear, then rose to a certain level, finally became stable.
采用粉末冶金法制备碳纳米管-银-石墨电接触复合材料，研究石墨含量的变化对复合材料接触电压降的影响。
In this paper, the effects of graphite content on the contact voltage drop of CNTs-Ag-G composites fabricated by means of powder metallurgy are studied.
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