SYNTHESIS OF A DIAMOND AND METAL MIXTURE BY THE CHEMICAL VAPOR-DEPOSITION PROCESS

A mixture of diamond and metal film was synthesized by a hybrid process combining plasma jet chemical vapor deposition and a plasma-spray process. Sprayed molybdenum and tungsten were changed to Mo2C and tungsten carbide, respectively, and the lattice constants of Ni, Fe, and Co were increased by carbon-plasma spraying. Adhesion of film to the substrate was improved using the hybrid process to form a layer 50 to 150-mu-m thick of mixed metal and diamond between the substrate and pure diamond film.