【摘要】 采用Hummers氧化法和肼还原法制备了石墨烯,并在45钢表面获得石墨烯/镍基复合镀层,研究了石墨烯的片层数量和热稳定性,对复合镀层的表面及截面形貌进行观察并测试其摩擦学性能。结果表明:肼还原法获得的石墨烯层数约2层,其热稳定性高于Hummers法获得的氧化石墨。不同石墨烯添加量(0.1,0.2和0.4 g/L)的镍基复合镀层厚度约20～30μm。干摩擦时,石墨烯添加量为0.4 g/L的复合镀层摩擦系数和磨损率最低,较基体分别降低了13%和65%,磨损表面较光滑并可见石墨烯沉积后的微凸体形态,Fe的含量极少,说明磨痕深度很浅。更多还原

【Abstract】 Two type of graphene was prepared by Hummers oxidation and hydrazine reduction respectively and then Ni-based composite coatings containing graphene were prepared on the surface of 45 steel by pulse electrode position. The lamellar quantity and thermal stability of the prepared graphene were characterized. While the surface and cross-sectional morphology and tribological properties of the composite coatings were assessed. Results indicate that the graphene obtained by hydrazine reduction method is of about two-layers, and its thermal stability is higher than the one prepared by Hummers oxidation. The thickness of Ni-based composite plating with different additions of graphene(0.1, 0.2 and0.4 g/L) is about 20～30 μm. The friction coefficient and wear rate of the composite coating with 0.4 g/L graphene reduce by 13% and 65% respectively in comparison to that of the substrate. The worn surface with micro-convexes like morphology is relatively smooth, which contains little Fe from the substrate,thereby implies that the depth of the wear surface is limited merely within the plating.更多还原