Film coated tools are rigid and high-temperature characteristics of a good collective material deposited diamond film is formed by chemical vapor deposition (cvd) tool. Since sin4 ceramics, wc + thermal expansion coefficient of diamond and carbide-based metal w co proximity, small thermal stress generated when the film, it can be used as the base material of the cutter body. wc + co Department of cemented carbide, binder phase co existence between easy to make diamond film and the substrate is formed of graphite and reduce adhesion strength required to be pretreated prior to deposition in order to eliminate the influence of co (typically by acid etching to co) .

Chemical vapor deposition is a method of using the gas containing certain activated c-source, at very low gas pressure, so that the carbon atoms deposited in a certain area, the carbon atoms in the condensed, forming a diamond phase deposition process. Currently used for the deposition of diamond cvd law include: microwave, hot filament, DC arc jet method.

Advantages of diamond film is used in a variety of complex tool geometries, such as a blade with a chip, end mills, reamers and drills; can be used to cut a lot of non-metallic materials, cutting force when cutting small, small deformation, smooth, abrasion slow, easy deformation of the workpiece for good workpiece material, finishing tolerances. The main disadvantage is the poor adhesion of diamond film and the substrate, the diamond film does not have a throwaway character.