摘要
采用化学镀法在石墨粉末表面镀镍制备Ni/石墨复合粉末,采用激光衍射粒度分析、扫描电镜等对Ni/石墨复合粉末的粒度和表面形貌进行表征,研究镀液中主盐硫酸镍、还原剂联氨及活化剂氯化钯的浓度对该复合粉末表面形貌的影响,并对Ni镀层在石墨表面的生长机理进行探讨。结果表明：硫酸镍质量浓度为20 g/L、联氨体积分数为2%时,化学镀沉积速率适中,Ni镀层在石墨表面分布均匀;氯化钯的质量浓度为0.03 g/L和0.1 g/L时,镍颗粒细小,镀层光滑平整;石墨表面Ni镀层的生长时间主要在化学镀过程的90~120 min之间,金属镍沉积在具有活化中心的区域,随着反应的进行逐步将石墨表面包覆完整。
The nickel/graphite composite powder was prepared by electroless nickel plating.Laser-diffraction and SEM were employed to observe particle dimension and surface morphology of nickel/graphite composite powder.The effects of main salt NiSO4,reducer N2H4 and activator PdCl2 on surface morphology of nickel/graphite composite powder were investigated.The growth mechanism of Ni deposits on graphite powder surface was also studied.Based on experimental results,some conclusions can be drawn as below： the deposition rate of electroless nickel plating is proper and nickel deposits is uniform when NiSO4 mass concentration is 20 g/L and N2H4 volume fraction is 2%.The crystal grain of nickel deposits is finer and homogeneous when PdCl2 mass concentration is 0.03 g/L and 0.1 g/L.The main growth period of nickel deposits is 90 min to 120 min from beginning.The nickel deposits grow firstly on activation center and cover whole surface of graphite particle as reaction proceeding.
出处
《粉末冶金材料科学与工程》
EI
2011年第5期710-715,共6页
Materials Science and Engineering of Powder Metallurgy
基金
湖南省科技计划资助项目(2009RS3024)
中国博士后科学基金资助项目(20080440178)
关键词
镍/石墨复合粉末
化学镀镍
表面形貌
生长机理
Nickel/graphite composite powder
Electroless nickel plating
Surface topography
Growth mechanism
