【摘要】 硬度低和耐磨性较差制约了铜在冶金设备领域的应用.为了提高铜金属表面硬度和耐磨性,采用镀镍料浆包渗铬技术对铜表面进行渗铬,制备渗铬层,并对其微观组织、扩散特性及显微硬度和耐磨性进行了研究.结果表明:铜表面经镀镍渗铬处理后,在镍层表面获得50μm的渗铬层,渗层组织为镍铬固溶体相;渗层硬度由外层的345 HV逐渐降低到镍镀层的120 HV和铜基体的70 HV,渗层显微硬度随铬含量的降低而降低.渗铬处理将铜和镍的摩擦系数由原来的0.8和0.6降低到0.45.更多还原

【Abstract】 The low hardness and decreased wear resistance of pure copper limit their metallurgical application.To enhance the microhardness and wear resistance on the surface of pure copper the chromized coating has been developed by a process with two steps: the first one was electrodeposition of Ni,followed by the second one of chromizing on nickel plating using slurry pack cementation method at 850 ℃ for 12 h.The microstructure,microanalysis diffusion,microhardness analyses and wear resistance were investigated.The results show that the phase of chromized coating with 50 μm in thickness mainly consists of chromium solid solution in nickel.The microhardness of surface decreases gradually from 345 HV of the chromized coating to HV 120 of nickel plating and 70 HV of pure copper.Friction coefficient of chromized coating at room temperature decreases from 0.8 of pure copper and 0.6 of nickel plating to 0.45 of chromized.coating.更多还原