镍基纳米SiC复合镀层的摩擦学性能

为研究镍基纳米 Si C复合镀层的摩擦学性能 ,在A3钢板上制备了该镀层 ,利用扫描电镜对镀层显微组织进行观察 ,通过纳米显微力学探针测量镀层微区硬度 ,在 MM-2 0 0摩擦磨损试验机上对镀层进行磨损试验 ,研究阴极电流密度、温度和镀液中 Si C浓度等主要工艺参数对镀层耐磨性能的影响。结果表明 :Si C颗粒在镀层中分布均匀 ;Si C颗粒附近镀层的硬度是纯镍镀层的 3倍 ,但随着远离 Si C,复合镀层硬度明显下降 ;复合镀层的耐磨性能与普通镍镀层相比有较大幅度的提高 ,在油润滑条件下磨损体积为普通镍镀层的 1/ 8。

Tribological properties of Ni/nano-SiC composite coatings

The microstructure of Ni/nano SiC composite coatings on A3 steel substrates was analyzed using a scanning electron microscope (SEM). A nano microhardness instrument (Nano Indenter II) was used to measure the hardness of the coating and the substrates. A MM 200 wear tester was used to measure the wearability. The effects of SiC concentration, current density and electrolyte temperature on the coating hardness and wear resistance were studied. The test results showed that the SiC particulate distribution was uniform in the coating. The hardness of the coating adjacent to the SiC particles was 3 times the hardness of a pure Ni coating, but the hardness decreased with distance from the SiC particles. The composite nano SiC coating had better wear resistance than a pure compact Ni coating.