Once grown directly from graphite polycrystalline diamond

Currently in high pressure and temperature polycrystalline diamond prepared mainly two ways: one is the synthetic diamond from graphite, diamond powder and then by sintering; another is grown directly from a graphite polycrystalline diamond. Strong shock waves in the direct synthesis of artificial polycrystalline diamond powder, unlike the explosion Diamond blade  static production of single-crystal diamond.  abrasive grinding  of single crystal diamond having a directivity, and its crystal structure, crystal morphology,  synthetic diamond  defects and crystal size. Isotropic polycrystalline diamond, no cleavage plane, not only has a high hardness and strength, but also has good toughness, and thus easier to overcome the single-crystal diamond brittle fracture along cleavage planes and soft reunion shortcomings;