COMPOSITE ELECTROFORMING TECHNOLOGY OFFABRICATING NICKEL-GRAPHITE COMPOSITES
-
摘要: 采用复合电铸技术制备了Ni-石墨自润滑复合材料, 重点研究了工艺参数(微粒浓度、电流密度、电铸液流动速度及温度和p H 值) 对复合材料中石墨微粒含量的影响。结果表明, 提高镀液中微粒浓度使复合材料中石墨含量增大, 最后趋于稳定值。电流密度和镀液流动速度使石墨含量存在最大值, 但是温度和p H 值的增加却使之降低。复合电铸沉积机理Guglielmi 模型只在低电流密度条件下适用, 但不适用于高电流密度的条件。镀液中石墨微粒含量增大, 复合材料的硬度和摩擦系数降低, 磨损失重减小, 但是石墨微粒30 g/ L 时的磨损量增加。Abstract: The process of the elect rolytic codeposition of nickel-graphite in nickel sulfamate solution was investigated. The result s show that the plating variables have different influence on the volume f raction of graphite particlesin elect rodeposited composites. The volume f raction of graphite incorporated in deposit increases with increasingconcent ration of suspended particles in solution, and then remains constant . There are maximums related to the current density and flow velocity, while temperature and p H values exert an adverse effect . Guglielmi’s model can beused at low current densities for the composite elect roforming system. The microhardness and friction coefficient ofNi-graphite composites decrease with increasing particle concent ration in solution. The wear mass loss also decreases, but it increases at the graphite concent ration of 30 g/ L.
-
-
计量
- 文章访问数: 1415
- HTML全文浏览量: 64
- PDF下载量: 850
下载:
