Nanostructured core–shell Ni deposition on micron SiC particles by electrolessprocesses

In this research,silicon carbide particles with an average particle size of 25 micro meters were nickel coatedusing electroless deposition method.Because thisprocess is autocatalytic, pretreatment of SiC powder is required beforecoating. The surface of the SiC particles was activated using SnCl2 and PdCl2 solutions .The electroless bath consistedof nickel choloride (NiCl2·6H2O) as Ni source, sodium hypophosphite (NaH2PO2·H2O) as reducing agent, sodiumcitrate (Na3C6H5O7.5, 5H2O) as complexing agent and NH4Cl as Baffer agent. The morphology and the chemicalcomposition of the coatings were characterized by scanning electron microscopy (SEM) and energy dispersivespectroscopy (EDS). The results showed that SiC particles were successfully coated by a nano structured,homogeneous and continuous Ni–P layer.

Keywords:

electroless , silicon carbide , coating