Superhard cutting tool is the modern engineering materials processing in the hardness of the higher requirements and came into being, the 20th century, 40 years have been greater development. The chemical composition of super-hard materials and the formation of hardness rules and other tool materials are different, cubic boron nitride is a non-metallic boride, the crystal structure of the face-centered cube; and diamond from carbon elements into its crystal structure and cubic nitrogen Boron is similar. Their hardness is much higher than other substances.
