CVD Diamond Coated Carbide Cutting Tool——Technical Matters (1/2)

Based on tungsten carbide cutting tool, it deposited a layer of diamond coating by using chemical vapor deposition (CVD), which makes it not only have the properties of tungsten carbide, but also have the excellent properties of diamond coating, such as high hardness and good wear resistance. Evaluation of the quality of diamond coating is mainly in the structure of film, the defects, especially the existence of the cracks. The existence and expanding of the cracks will remarkably decrease the comprehensive properties and serve life of the cutting tools. Therefore, in order to optimize diamond coated cemented carbide cutting tool, some new processing are emerging based on traditional chemical vapor deposition (CVD) and physical vapor deposition (PVD), such as low pressure CVD, plasma CVD, vacuum cathodic arc deposition (VCAD), DC arc plasma spraying CVD, hot wire CVD and so on.

Next, sharpening process after finishing is also the major problem in diamond coated cemented carbide cutting tool. Due to the diamond coating by CVD is composed of coarse particles, which is difficult to ensure high precision cutting. In addition, sharpening process is too complicate to have a bad influence on the quality and service life of diamond coating during the process. Thus, the relevant researchers through improved diamond film deposition process conditions to obtain micron, even nano diamond film, which makes the sharpening process not so necessary and decrease the fabricating cost and effectively avoid the problems of sharpening process brings in.

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