Method and apparatus for producing synthetic diamond structures

Details Method and apparatus for producing synthetic diamond structures Method and apparatus for producing synthetic diamond structures

C - Chemistry, Metallurgy

30

B

C30B 29/04 (2006.01) C23C 16/01 (2006.01) C23C 16/27 (2006.01) C23C 16/26 (2006.01)

Patent

CA 2053180

Method and apparatus are disclosed for producing a non-planar synthetic diamond structure of predetermined shape. A non-planar mandrel surface of the predetermined shape is provided and the mandrel surface is coated with a release substance. Synthetic diamond is deposited on the coating of release substance. The release substance is then activated to effect release of the deposited synthetic diamond structure. In a disclosed embodiment of the method of the invention a dome-shaped hollow mandrel is coated with a metal-containing substance, and synthetic diamond is deposited over the coating using a plasma jet deposition process. The metal-containing substance is then heated to release the resultant diamond structure from the mandrel. In a form of the disclosed method, the metal-containing substance is a metal alloy which is highly polished before deposition of synthetic diamond thereon. The step of depositing synthetic diamond may include varying the deposition conditions during the depositing of diamond to obtain layers of diamond having different properties. In an embodiment of the apparatus of the invention, means are provided for rotating the mandrel in a deposition chamber, and means are also provided for moving the deposition system in the chamber, such as in an arc over the rotatable mandrel.

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