【摘要】 碳纳米管具有超强的力学性能,极高的纵横比、高的化学和热稳定性及导电性,是制备复合材料的理想组元。本文采用大功率CO2激光器,以45碳钢为基体,制备了激光熔覆的CNTs复合涂层。研究了在激光作用下,工艺参数对涂层性能的影响,并对复合涂层进行了摩擦磨损试验。试验结果表明:经激光熔覆处理制备的CNTs复合涂层,其耐磨性能显著提高,磨损失重是未处理的38%,摩擦系数也显著下降,是未处理试样的37%。更多还原

【Abstract】 Carbon nanotubes(CNTs) possess significant advantages such as superstrong mechanical properties,very high aspect ratio,high chemical and thermal stability and unique electrical conductivity.CNTs are hence considered as the ultimate type for the novel composites.CNTs composite coatings were prepared on carbon steel plate by high power of continuous wave CO2 laser beam.The fabrication of CNTs composite coatings was investigated.The friction and properties were examined under dry sliding conditions using pin-on-disc test machine.For reference,the graphite composite coatings were investigated.The results show that the CNTs composite coating has a microhardness value of 840Hv,greater than for graphite composite coating.The CNTs composite coating possesses not only a higher wear resistance but also a lower friction coefficient.It is interest to note that the wear mass loss and friction coefficient of CNTs composite coatings reduced to about 38% and 37% of those without coating,which due to their improved mechanical characteristics and the unique topological structure of the hollow nanotubes.更多还原