Cubic boron nitride nano-twinned

Synthesis of cubic boron nitride nano-level, has surpassed its hardness diamonds, as the world's hardest substance. cutting tools test results show that the Vickers hardness of 108 GPa, and the synthetic diamond Vickers hardness of 100 GPa, and the hardness of the material is twice the commercial polycrystalline diamond with a similar crystal structure boron nitride abrasive grinding as starting material, the use of high pressure technology successfully synthesized nano-twinned cubic boron nitride new material.