巴基管增强镍基自熔合金喷涂层在油润滑条件下的摩擦磨损特性

Tribological Behavior of Nickel-basedSelf-fluxing Alloy Composite Coatings Reinforced by Buckytube

采用氧乙炔火焰喷涂法在45#钢表面制备巴基管增强镍基自熔合金复合喷涂层,并利用激光对所得喷涂层进行重熔处理,用X射线衍射仪和扫描电子显微镜分析复合涂层组织结构,在MHK-500型摩擦磨损试验机上测定了油润滑条件下涂层的摩擦学性能.结果表明:激光重熔巴基管增强镍基合金喷涂层均匀、致密且与基体结合牢固;巴基管可以显著提高镍基自熔合金涂层的硬度和在油润滑条件下的耐磨性能,当复合涂层中巴基管质量分数为0.5%时,其耐磨性最佳;巴基管对复合涂层的减摩效果不明显.

The thermal spraying process was used to obtain composite coatings of nickel-based self-fluxing alloy reinforced by Bucky-tube on the plain carbon steel substrate. The composite coating was remelted by laser beam. The hardness and the structure of the composite coating had been analyzed, and the friction and wear behavior of the composite coating under the oil-lubricated condition was examined on a ring-on-block test rig. The results showed that the composite coating was very compact after plasma spraying and laser remelting. The microhardness and wear-resistance of the composite coatings increased with the increase of Bucky-tube content. The maximum wear resistance of the composite coating was obtained when the mass fraction of the Bucky-tube is 0.5%. The increase in the microhardness and wear-resistance of the composite coatings was attributed to the strengthening function of the Bucky-tube and the improvement in the coating structure caused by the Bucky-tube reinforcing modification.