镍-碳纳微米球的制备及其形成机制

Preparation and Formation Mechanism of Nickel-Carbon Nano/Micro-Spheres

由于对涂料中填料密度的进一步要求,使得低密度的填料成为研究的热点。采用可控碳化技术制备了低密度的碳球并通过化学镀膜工艺将碳球表面金属化,制备了直径为0.1～2.0μm,密度约为1.04 g/L,球面含碳11.52%,含镍75.17%的镍-碳纳微米球。结果表明,含有-OH,C=O,-CH活性基团的纳微米碳球对于改善碳球表面的亲水性能,提高微球在镀液中的分散性,促进球-液界面还原氢H吸附的形成,加速化学镀镍反应的进行起到了重要的作用。由此得到的镍碳球大大降低了填料的密度,使得填料在涂料中分散更加均匀。

Carbon spheres with a low density were prepared by controlled carburization.Surfaces of resultant carbon spheres were metalized by electroless plating.Ni-C nano/micro-spheres with a diameter of 0.1~2.0 μm,a density of about 1.04 g/L,a carbon content of 11.52% and a nickel content of 75.17% were prepared.The carbon spheres containing active groups like-OH,C=O and-CH showed good hydrophilicity and dispersibility in nickel plating bath,thereby enhancing the adsorption of reduced hydrogen at the sphere-liquid interface and accelerating the reaction of electroless nickel plating.Resultant Ni-C spheres contributed to lowered density and increased distribution uniformity of Ni-C nano/micro-sphere filler.