Metal and Carbide Coatings of Ceramics Particles Using Chemical Plating Techniques (粉末製造技術<特集>)

概要

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Metal coatings of SiC and TiC particles were carried out by chemical plating techniques. The ceramics particles were activated with SnCl2 and PdCl2 solutions. Amorphous Ni-P alloy coat-ing was deposited from NiCl2 solution using NaH2PO2 as reducing agent. The coating amount decreased when the amount of suspended powder and the particle size were too small. Although fine.ceramics particles were agglomerated after plating, metal phase was distributed within the agglomerates. Crystalline Ni coating was deposited from NiSO4 solution by high pressure H2 reduction using an autoclave. By the H2 reduction plating, MoOx coating was also deposited from ammonium molybdate solution, and WOx coating from ammonium tungstate solution. They were converted to Mo and W coatings by H2 reduction at 1000°C and subsequently to Mo2C and WC coatings by CH2 carburization at 1000-1100°C.