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通过非均匀形核法,在纳米金刚石黑粉颗粒表面包覆一层Al2O3,采用包覆后颗粒制备了Ni-P-纳米金刚石黑粉化学复合镀层.通过沉降法分析了包覆前后纳米颗粒悬浮液的分散稳定性;研究了金刚石质量浓度、搅拌转速及粉体热处理工艺对复合镀层显微硬度和耐磨性能的影响;利用SEM和EDS分析了镀层微观形貌和组分.结果表明:颗粒表面包覆氧化铝可以显著提高其在分散介质中的悬浮稳定性;综合考虑摩擦磨损特性,其最优工艺参数为金刚石质量浓度4 g/L,搅拌转速500 r/min,复合粉体经100℃下热处理4 h;与Ni-P镀层相比,复合镀层摩擦系数降低58%,耐磨性能提高59%.
Through the heterogeneous nucleation method, a layer of Al2O3 was coated on the surface of nano-diamond black particles, and the Ni-P-nano-diamond black composite coating was prepared by using the coated particles.The nano-particle suspension was analyzed by sedimentation method Liquid dispersion stability of the coating was studied.The effects of diamond mass concentration, stirring speed and powder heat treatment process on the microhardness and wear resistance of the composite coatings were studied.The microstructure and composition of the coatings were analyzed by SEM and EDS.The results showed that the particles Considering the friction and wear characteristics, the optimum process parameters are diamond mass concentration 4 g / L, stirring speed 500 r / min, and the composite powder 100 ℃ for 4 h. Compared with Ni-P coating, the friction coefficient of the composite coating is reduced by 58% and the wear resistance is improved by 59%.