Synthesis of Carbon Nanocoatings on YG8 Hardmetal Substrates in Oxygen-Acetylene Flame

In this paper, carbon nanocoatings were prepared on YG8 (WC-8 wt.%Co) hardmetal substrates by using the oxygen-acetylene flame method. It was shown that the morphology and quality of carbon nanocoatings were greatly affected by the position at which the hardmetal was placed in the flame and the surface pretreatment of the hardmetal. Small nodular particles aggregated by short needles were synthesized on the acid-etched substrate, while cauliflower-like diamond particles were deposited on the mechanically-polished and acid-etched substrate. The cross-section observation indicated that there was a good mechanical interlocking between the deposited diamond coating and the substrate.