Film coated tools are in good rigidity and high temperature properties of diamond thin films deposited on the collective material made by chemical vapor deposition (CVD) tools.

Since the Si3N4 ceramics, WC-Co-based heat metal cutting wheels expansion coefficient of diamond and metal carbide of W close to the small thermal stress generated during film, so can be used as the base material of the cutter body. WC-Co based cemented carbide cutting blades, a binder phase of Co easy to make the presence of the substrate between the diamond film and the adhesive strength is reduced to form the graphite, need to be pretreated prior to deposition to remove the effect of Co (generally by acid etching to Co) .
Chemical vapor deposition method is a method of using a C-containing gas source to activate, at very low gas pressure, a certain area of the carbon atoms deposited on the carbon atoms in the condensation formed during the deposition of the diamond phase. Currently used for the deposition of diamond by CVD include: microwave, hot filament, DC arc jet method.
Advantages of diamond films are used in a variety of complex geometry tools, such as a blade with chips, end mills, reamers and drills; may be used to cut a lot of non-metallic materials, cutting force when cutting small, small deformation, smooth, slow tile granite cutting discs wear, easy deformation of the workpiece for the workpiece material, tolerances finishing. The main disadvantage is the poor adhesive strength of the diamond film and the substrate, the diamond film having no regrinding of the cutting tool.