ABSTRACT
Abstract-Since the discovery of diamond thin film synthesis using chemical vapor deposition (CVD), a wide range of applications have benefited from this technology. In the machining industry, cemented carbide tool inserts were coated with thin CVD diamond films to extend their wear life beyond their nominal machining performance. Premature failure of CVD diamond coatings to carbide inserts caused by a combination of mechanical, chemical and thermal factors remains a challenging difficulty. Procedures such as chemical etching with an acidic solution, mechanical scratching with diamond grit, and the use of intermediate layers of various materials, among other novel techniques, were shown to enhance nucleation of diamond growth and improve adhesion. To evaluate the effect of such techniques, some comparative adhesion evaluation procedures have been developed. Whereas useful studies addressed several of the issues, the field remains open to additional key investigations that will enlighten the full understanding of this topic.
