不同电流密度下电沉积金刚石增强镍基复合涂层的微观结构与耐磨性能  

Microstructure and Wear Resistance of Electrodeposited Diamond Reinforced Nickel-Based Composite Coatings at Different Current Densities

作　　者：陈志翔 赵远涛 田冉 刘沈强 潘正阳 李文戈[1] 尹莉 刘彦伯 CHEN Zhixiang;ZHAO Yuantao;TIAN Ran;LIU Shenqiang;PAN Zhengyang;LI Wenge;YIN Li;LIU Yanbo(Merchant Marine College,Shanghai Maritime University,Shanghai 201306,China;Shanghai Nanotechnology Promotion Center,Shanghai 200000,China)

机构地区：[1]上海海事大学商船学院,上海201306 [2]上海市纳米科技与产业促进发展中心,上海200000

出　　处：《机械工程材料》2024年第5期90-96,共7页Materials For Mechanical Engineering

基　　金：上海市青年科技英才扬帆计划项目(20YF1416400);上海市科技计划项目(20DZ2252300)。

摘　　要：采用电沉积技术在1,2,5,10 A·dm^(-2)电流密度下制备金刚石增强镍基复合涂层,研究了复合涂层的微观结构和耐磨性能;通过COMSOL软件对阴极表面镍晶粒生长情况进行仿真,分析了不同电流密度下金刚石颗粒对复合涂层微观结构的优化作用。结果表明:在1,2 A·dm^(-2)电流密度下复合涂层的结构致密均匀,金刚石含量较多,随着电流密度的增大,金刚石含量减少,涂层表面出现金字塔结构;复合涂层呈现出明显的[200]丝织构,随着电流密度的减小,织构强度降低,晶粒尺寸减小。小电流密度下更多金刚石颗粒的沉积阻碍了其底部镍晶粒的生长,且金刚石颗粒周边较高的电流密度使得金刚石对镍晶粒的细化作用加强。在干摩擦的条件下,随着电流密度的增大,复合涂层的稳定摩擦因数和磨痕尺寸增大,磨粒磨损程度增大,耐磨性能降低;当电流密度为1 A·dm^(-2)时,复合涂层的稳定摩擦因数最小,磨痕深度和宽度最小,耐磨性能最好。Diamond reinforced nickel-based composite coatings were prepared by electrodeposition technology at current densities of 1,2,5,10 A·dm^(-2).The microstructure and wear resistance of the composite coatings were studied.The growth of nickel grains on the cathode surface was simulated by COMSOL software,and the optimization effect of diamond particles on the microstructure of the composite coatings at different current densities was analyzed.The results show that the structure of nickel diamond composite coatings prepared at current densities of 1,2 A·dm^(-2) was dense and uniform with a higher diamond content.As the current density increased,the diamond content decreased,and a pyramid structure appeared on the surface.The composite coatings exhibited an obvious[200]silk texture,and as the current density decreased,the strength of the texture and the grain size decreased.The deposition of more diamond particles at low current densities hindered the growth of nickel grains at the bottom,and the high current density around the diamond particles enhanced the refining effect of diamond on the nickel grains.Under the dry friction conditions,with the increase of current density,the stable friction coefficient and wear scar size of the composite coating increased,the abrasive wear degree increased,and the wear resistance decreased.when the current density was 1 A·dm^(-2),the composite coating had the smallest stable friction coefficient and the depth and width of the wear scars;the wear resistance was the best.

关 键 词：金刚石增强镍基复合涂层 电沉积 微观结构 耐磨性能 

分 类 号：TQ153[化学工程—电化学工业]