Adherent diamond coatings on cemented tungsten carbide substrates with new Fe/Ni/Co binder phase

Surface morphology and bond characterization of nanocrystalline diamonds grown on tungsten carbide via hot filament chemical vapor deposition

“…Most pretreatment steps involve two major steps, a chemical and/or mechanical pretreatment and a seeding treatment. Other methods of depositing NCD on substrates include adding a double bias between the substrate and filament [12][13][14], using dry detonation of nanodiamond powder [2], replacing the binder phase [15] and using interlayer [16] scratch, grind and polish to modify the surface roughness as it is known that diamonds nucleate spontaneously on defects. The defects increase the surface-to-volume fraction, leading to higher contact with precursor gases, thus leading to faster carbon saturation and lower total free energy.…”

WC–TiC–Ni cemented carbide with enhanced properties

“…Cobalt currently dominates the market as a binder of cemented carbide because of its unique properties [1]. However, the market price of cobalt has been relatively unstable during the last years [2]. Considerable amount of research [3][4][5][6][7][8] has been carried out to find a satisfactory alternative binder for cobalt.…”

Enhancing the adhesion of diamond films on cobalt-cemented tungsten carbide substrate using tungsten particles via MPCVD system

“…Finally, Rockwell-A hardness values were determined with a diamond indenter (Mitutoyo, ARK-600) to investigate the adhesive characteristics of the diamond films coated with WC-Co substrates. In many studies [3,7,14,18], Rockwell-A hardness measurements are used to detect the adhesion of diamond films, although a standard load for the test does not exist. In this study, we used a 60 kg load for the indentation test.…”

“…The catalytic effect of the cobalt binder on sintered WC-Co has a detrimental effect on the growth of diamond films, favoring the formation of graphite or non-diamond phase carbon. Various approaches can be employed to avoid the negative influence of cobalt on mechanical tools, including chemical etching of the Co surface [3][4][5][6], forming stable Co compounds [7,8], and depositing a protective layer on the substrate [9][10][11][12][13][14][15]. Those surface modification methods improve the adhesion of diamond film by removing most of the cobalt from the surface of the substrate with a diluted acid solution.…”