Synthetic diamond production

The instantaneous static synthetic diamond or high pressure high temperature technology, ultra-high pressure or high temperature techniques, or a mixture of both techniques, the carbonaceous cubic boron nitride as graphite or a molten state from a solid directly into the diamond, the diamond is obtained by this method micron size polycrystalline powder.
   Melting media method static high pressure synthetic diamond (50 ~ 100kb, namely 5 ~ 10GPa) and high temperature (1100 ~ 3000 ° C) technology through the carbonaceous materials such as Abrasive grinding wheel metals (alloys) to form diamond, the typical crystalline the cube (hexahedron), octahedron and six - octahedra and their transitional forms. Important applications in industry showing the value of the media law is mainly static melt. Obtained in this way production of synthetic diamond abrasive grade natural diamond has been exceeded, the problems to be solved is to increase the ratio of coarse particles, to improve the conversioncutting tools crystal quality. Currently under laboratory using static media studied melting quality single crystal diamond formation of large particles. Seeded epitaxial growth method has been weighing 1 carat of large single crystals; using ordinary testing techniques slightly improved, he got about 2 to 4 mm crystal. This method also uses a large grain growth and sintering of polycrystalline diamond, which has been obtained in certain industrial applications, the key problem is to further improve such a polycrystalline diamond compressive strength, impact strength, abrasion resistance and heat resistance and other performance.
   Synthetic diamond epitaxial method is the use of pyrolytic carbonaceous substances and electrolytic precipitation of certain carbon or some of the diamond seed crystal substrate from the effects of substances formed by epitaxial growth on.