滑动电接触材料应具有良好的耐磨性能以及出色的导电性能,在航空航天领域中,制造先进的电接触材料尤为重要.实验中采用粉末冶金法制备CNTs-Ag-MoS2-G复合材料,研究了复合材料电摩擦磨损过程中的接触电阻及磨损率的变化,并通过扫描电子显微镜观察材料磨损后表面形貌.实验结果表明:在电流密度从5A/cm2增加到15A/cm2的过程中,复合材料接触电阻下降,体积磨损量增加,并且由于电弧侵蚀作用的影响,正刷的磨损量大于负刷,碳纳米管的特殊的基体增强作用及一定的导电导热能力使得CNTs-Ag-MoS2-G复合材料磨损量小于Ag-MoS2-G复合材料磨损量.
Electrical sliding contact materials are requested to have excellent anti-friction and electrical contact properties.In the area of aerospace,it is very important to produce advanced electrical contact composite materials.CNTs-Ag-MoS2-G composites used in the experiment were fabricated by means of powder metallurgy method.The contact resistance and wear volume loss of the composites in the electrical sliding wear were investigated,and the worn surfaces were observed by SEM as well.The resuits showed that the contact resistance decreased but the wear volume loss increased while the current intensity changed from 5A/cm2 to 15A/cm2.The wear volume loss of the positive brushes was larger than that of the negative brush because of the consequences of arcing,and also the wear volume loss of CNTs-Ag-MoS2-G composites was less than that of Ag-MoS2-G composites for the particular effect of carbon nanotubes on matrix reinforcement and electrical thermal conductivity.
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