Tribological and Mechanical Properties of Synthetic Diamond Coatings

Tungsten carbide composite (WC ̶ Co with different grades) is the commonly used material for cutting tools and tribological components because of its high hardness and high wear and corrosion resistance. During the machining of some hard composite materials the conventional WC ̶ Co cutting tools are subjected to high abrasive wear because they contain constituent hard reinforced particles. Nowadays synthetic diamond coatings obtained by chemical vapor deposition (CVD) process play an important role in improving the performance of the carbide tools while machining these composite materials because of their superior mechanical and tribological properties. But the main problem of these diamond coatings is the coating de-lamination under high mechanical loads experienced during the machining process. The existing manufacturing processes and materials demand wear-resistant and high hardness coatings for better performance and durability of cutting tools. In this work the study was undertaken to evaluate the tribological and mechanical properties of CVD diamond coatings deposited on cemented tungsten carbide composite using various coating.