化学镀法制备镍包石墨复合粉末

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...

Preparation of nickel/graphite composite powder by electroless nickel plating

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.