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pH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pH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30g/L时的磨损量增加。
The process of the electrolytic codeposition of nickel-graphite in nickel sulfamate solution was investigated. The results show that the plating variables have different influence on the volume fraction of graphite particles in electrodeposited composites. The volume fraction of graphite incorporated in deposit increases with increasing concentration of suspended particles in solution, and then remains constant. There are maximums related to the current density and flow velocity, while temperature and pH values exert an adverse effect. Guglielmi's model can be used at low current densities for the composite electroforming system. The microhardness and friction coefficient of Ni-graphite composites decrease with increasing particle concentration in solution. The wear mass loss also decreases, but it increases at the graphite concentration of 30 g/L.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2005年第3期92-97,共6页
Acta Materiae Compositae Sinica
基金
国家高技术研究发展计划("863"计划)项目(2002AA334010)
上海市科委重点新材料项目(035211037)
上海市科技发展基金项目(0211nm052)
关键词
复合电铸
镍-石墨
金属基复合材料
电沉积机理
Current density
Electrodeposition
Electroforming
Friction
Graphite
Mechanisms
Metallic matrix composites
Microhardness
Nickel
pH effects
Scanning electron microscopy
