Diamond synthesis

Details Diamond synthesis Diamond synthesis

B - Operations, Transporting

01

J

148/3.6

B01J 3/06 (2006.01) C01B 31/06 (2006.01) C30B 29/06 (2006.01)

Patent

CA 1330751

A B S T R A C T Large diamond crystals are produced in a reaction vessel which contains a tetrahedrally bonded crystalline non-diamond seed material separated from a source of substantially pure carbon by a mass of metallic catalyst/solvent for diamond synthesis. The arrangement is such that a temperature gradient is created between the seed material and the carbon source under the applied conditions of temperature and pressure such that the seed material is located at a point near the minimum value of temperature for the gradient and the carbon source is located at a point near the maximum value of temperature for the temperature gradient. Examples of suitable non-diamond seed material are cubic boron nitride and .alpha.-silicon carbide.

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