Synthetic diamond manufacturing method

Direct method

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  Polycrystalline diamond such 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 law

Static high pressure synthetic diamond (50 ~ 100kb, namely 5 ~ 10GPa) and high temperature (1100 ~ 3000 ° C) technology through the carbonaceous materials such as graphite and certain metals (alloys) reaction of diamond, cubic crystalline state of a typical (hexahedron), octahedron and six - octahedron 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  abrasive wheels  been exceeded, the problems to be solved is to increase the ratio of coarse particles, improve the conversion rate and improving the 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. In this way also the growth and

Sintering of large particles 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.

Epitaxy

Synthetic diamond is the use of certain pyrolytic carbonaceous substances and electrolytic precipitation of carbon or some of the diamond seed crystal substrate from the effects of substances formed by epitaxial growth on.

Wu Tzu reaction

Scientists have invented a method: Let the carbon tetrachloride and sodium at 700 ℃, the reaction of the diamond. But will also generate a lot of graphite.