Nanostructured core-shell Ni deposition on SiC particles by alkaline electroless coating

In this study, core-shell nanostructured nickel formation on silicon carbide (SiC) ceramic powders was achieved through the electroless deposition method using alkaline solutions. To produce a nano core-shell Ni deposition on the SiC surfaces, process parameters such as pH values, the type of reducer material, deposition temperature, stirring rate and activation procedure among others were determined. Full coverage of core-shell nickel structures on SiC surfaces was achieved with a grain size of between 100 and 300 nm, which was approximately the same deposition thickness on the SiC surfaces. The surface morphology of the coated SiC particles showed a homogenous distribution of nanostructured nickel grains characterized by scanning electron microscopy and X-ray diffraction techniques. The nanostructures of the crystalline Ni coatings were observed to be attractive for achieving both good bonding and dense structure. The thin core shell-structure of Ni on the SiC surfaces was assessed as a beneficial reinforcement for possible metal matrix composite manufacturing.

► Thin core shell-structure of Ni on the SiC surfaces was assessed beneficial as reinforcement for possible metal matrix composite manufacturing. ► The grain size of Ni on the surface of SiC particles was obtained between 100 and 300 nm depending on hypophosphate and particle content in the electrolyte. ► The effect of processing parameters of the Ni deposition on the surfaces of SiC powders in the core-shell structures, two series of experiments were carried out at different reducer contents and powder concentrations.