( 湖南大学 材料科学与工程学院, 长沙 410082)
摘 要: 对CVD法制备的碳纳米管进行了表面改性和修饰, 然后通过化学共沉积方法制备了高硬度的碳纳米管复合镀层, 并研究了碳纳米管复合镀层在不同摩擦组合下的摩擦学行为。 结果表明： 经过改性处理后的碳纳米管表面拥有丰富的表面官能团, 这使大量的碳纳米管复合于镀层中, 从而导致了镍磷复合镀层的硬度显著提高, 达到946 HV。 摩擦实验得出, 在润滑状态下以钢环为摩擦副, 碳纳米管增强的镍磷复合镀层比传统耐磨材料SiC增强的镍磷复合镀层具有更低的摩擦系数和磨损率。 此外, 不同摩擦组合下的摩擦结果表明, SiC复合镀层相互摩擦时尽管拥有较低的磨损率, 但其摩擦系数仍然较高, 而碳纳米管复合镀层相互摩擦时表现出最低的摩擦系数和磨损率, 其摩擦系数和磨损率分别为0.108 7和1.49×10-3 g/m。
关键字: 碳纳米管; 表面改性; 复合镀层; 摩擦行为
（College of Materials Science and Engineering,
Hunan University, Changsha 410082, China）
Abstract: After multi-walled carbon nanotubes(MWNTs)were modified and dispersed uniformly in electrolyte, the MWNTs nickel-phosphorus based composite coatings of high hardness were prepared by chemical deposition technique. The results show that hydroxylic groups and carboxylic groups exist on the surface of carbon nanotubes after acid treatment. The loading capacity and disperision ability of MWNTs within the composite coating can be improved effectively by surface modification with surfactant. Due to the addition of MWNTs, the microhardness of MWNTs composite coating is improved and the value of microhardness reaches HV 946. The Ni-P-MWNTs composite coatings revealed a lower wear rate and friction coefficient compared with SiC composite coatings, especially, their triboligical properties are more excellent at the combination of MWNTs composite coatings. Their friction coefficient and wear rate are 0.108 7 and 1.49×10-3 g/m, respectively.
Key words: MWNTs; surface modification; composite coating; tribological behavior
