Superhard materials refer to polycrystalline diamond (PCD) and polycrystalline cubic boron nitride (CBN). PCD

(Polycrystalline

Diamond) is a fine grain sintered diamond body with different structure orientation. Because PCD sintered body is isotropic, it is not easy to crack along the single cleavage plane. PCD tool because of its good processing quality and processing economy in non-metallic materials, non-ferrous metals and their alloys, metal-based composite materials such as cutting the field shows the advantages of other tools is difficult to match. With the deepening of the PCD tool theory, especially in the progress of its chemical stability, PCD tool in the field of cutting tool position will become increasingly important, and its scope of application will be further expanded.