偶件表面粗糙度对碳纤维增强尼龙复合材料摩擦学性能的影响

在栓-盘摩擦磨损试验机上考察了干摩擦条件下偶件表面粗糙度对碳纤维增强尼龙（PA1010）复合材料摩擦学性能的影响，采用不迩显微镜观察分析了偶件表面转移膜的形貌。结果表明，碳纤维能够明显提高PA1010的耐磨性能，当碳纤维增强相的质量分数为10%和20%时，增强PA1010复合材料的磨损率比非增强PA1010的降低3～6倍。这是由于碳纤维起到了承载作用并具有较强的抗犁削能力所致，磨损表面形貌光学显微分析表明：磨损前后偶件表面形貌发生了明显的变化；当偶件表面粗糙度Ra处于0.11～0.13um范围内时，复合材料的摩损率最低；随Ra值的增大或减小微切削和转移膜疲劳脱落加剧致使复合材料的磨损率快速增大。

Effect of Counterpart Surface Roughness on the Tribological Behavior of Carbon Fiber Reinforced Polyamide 1010 Composites

The dry sliding friction and wear behavior of carbon fiberreinforced polyamide 1010-based composites in sliding against AISI1045 steel counterpart was investigated with a pin-on-disc test rig, with an emphasis on exploring the effect of the counterpart surface roughness on the tribological behavior of the composites. The changes of the steel surface topography were examined with a profilometer, while the morphology of the polymer and composite transfer films formed on the steel counterpart surface was observed with an optical microscope. The results show that the carbon fiber acts to considerably decrease the wear rate of PA1010. This is attributed to the load-carrying function and lubricity of the carbon fiber. The friction and wear behavior of PA1010 and its reinforced composites is dependent on the counterpart surface roughness. A lowest wear rate of the composite is recorded at a counterpart surface roughness Ra 0.11～0.13 μm, while too high or too small counterpart surface roughness corresponds to higher wear rate of the composites. This is because the wear resistance of the composite is governed by the transfer film characteristics which are related to the counterpart surface roughness.