Tribological Behavior of Ni-P Deposits on Dry Condition

采用化学镀的方法,调整Ni-P化学镀工艺参数及使用热处理工艺,获得了不同微观结构的镀层。并使用电子探针,XRD,显微硬度测试仪及摩擦磨损试验仪研究了镀层性能。结果表明,增加镀层纳米相含量可以提高镀层的显微硬度,其值可以达到400℃热处理时的硬度。强化机理包括固溶强化和析出强化,这取决于镀层中的磷含量和热处理温度。进一步的摩擦磨损实验结果表明,纳米相含量高的镀层在400℃热处理前后均表现出较好的显微硬度以及较低的摩擦系数,具有良好的抗磨损能力。

Tribological Behavior of Ni-P Deposits on Dry Condition

The deposits of electroless Ni-P prepared by different process were studied by means of EPMA, XRD, microhardness tester, friction-wear instrument. The experimental results show that the microhardness of the deposits will change with different microstructures and heat treatment temperatures. The microhardness of as-plated deposit will increase upon increasing the content of the nanocrystalline phase in the matrix, which can be up to the microhardness of the Ni-P deposit heat treated at 400 oC for 1 h. The strengthening mechanism for Ni-P deposit is either solid solution strengthening or precipitation strengthening, which depends on the phosphorus content and the heat treatment temperature. The friction-wear results show that the Ni-P deposits consisting of more nanocrystalline phase exhibit better microhardness, lower friction coefficient before and after heat treatment at 400 oC, and good wear-resistant performances