PCBN is made by high pressure high temperature sintering of cubic boron nitride with a binder phase, and there are mainly tow groups of binders, namely metal binder and ceramic binder. CBN and diamond are very similar in crystal structure,chemical bond and lattice parameters,thus they perform quite similar hardness and strength. In cutting applications, thewear resistance of PCBN exceeds 50 times that of tungsten carbide.
PCBN inserts are suitable for the high-speed and super high-speed precision machining of hardened steel of HRC>45, wear-resistant cast iron, heat-resistant alloys of HRC>35, pearlite grey cast iron, nodular cast iron, Fe-based P/M sintered materials and hardened cast iron.