粘结剂特性对填充树脂复合材料摩擦学性能的影响

采用酚醛树脂、丁腈橡胶改性酚醛树脂和聚四氟乙烯（PTFE）作为粘结相，通过填充一定配比的石墨、焦炭及碳黑制备了3种树脂基复合材料电刷试样，并在MM-200型摩擦磨损试验机上对比考察了复合材料试样与铜对摩时的摩擦磨损性能，结果表明，与未改性的酚醛树脂基复合材料相比，改性酚醛树脂基复合材料由于韧性提高和硬度降低，因而磨损加剧；但相应的偶件铜环的磨损有所减轻，PTFE基复合材料具有良好的综合性能，偶件铜环的磨损亦较小，因此是一种潜在的高性能电刷复合材料。

Effects of Bond Characteristics on The Performance of Carbon Based Composite

Several resin based composites were prepared by filling of graphite, carbon black and coke in phenolic resin, NBR modified phenolic resin and polytetrafluroethylene (PTFE) as the bonding agents. The specific resistivity of the composites was measured, while their friction and wear behavior sliding against copper examined on an MM 200 friction and wear tester. The morphologies of the worn surfaces of the composites were observed with a scanning electron microscope, while the worn surface morphology of the counterpart copper observed with an optical microscope. As the results, the hardness and wear resistance of carbon filled modified phenolic resin based composite are lower than those of the filled phenolic resin based composite, though the corresponding counterpart copper in the former case experiences decreased wear. The main wear mechanisms of the composites include adhesion wear, abrasive wear, and scuffing. Sine the filled PTFE based composite registers the best wear resistance and the lowest wear of the counterpart copper ring, it would be a promising candidate as a novel advanced electric brush material.