CVD diamond is a high abrasion resistance of pure diamond material, without binding agent, it is in the low pressure (<0.1MPa) prepared. CVD diamond mainly has CVD film coating (CD) and CVD thick film (TFD) in two forms.
CD is CVD (chemical vapor deposition) process, in the carbide substrate (commonly used K alloy) deposited on the thickness of about 10 ~ 30μm, composed of polycrystalline diamond-like diamond.
Because the matrix is ​​easy to make complex shapes, it is suitable for geometric shapes of complex tools, such as tap, drill, end mill and chip breaker with indexable flap. International tools market has CD tool products, such as Sweden Sandvik’s CD1810 and the United States Kennametal’s KCD25, mainly for non-ferrous metals and non-metallic materials, high-speed precision machining, tool life than the uncoated carbide cutting tools Improve nearly ten times or even several times. But the CD tool is not suitable for processing a class of metal composite materials, because the hard material in the composite material in a very short period of time will be a layer of wear on the surface of the tool wear, so although the price of CD tools than similar PCD tool to be low, But because of the diamond film and the substrate material between the adhesion is small, thus limiting its wide range of applications.

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