采用粉末冶金法制备碳纳米管-银-石墨复合材料,通过对比不同轨迹上的正负电刷接触电压降,研究极性对复合材料电刷接触电压降的影响.结果表明,一定电流密度下.负刷的电压降始终大于正刷,且正负电刷的电压降的变化趋势相同:先上升然后趋于稳定.随着电流密度的增大,电刷的总电压降增幅不大.
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