Patent ID: 7118782

Claim:
A method for forming a diamond coating on a substrate in a sealed chamber, comprising the steps of: combining a graphite rod and a catalytic metal wire to form a graphite assembly, wherein the catalytic metal wire is wrapped around the graphite rod the metal wire in combination with the graphite rod promoting chemical reactions needed for diamond deposition, and placing the substrate and the combined graphite rod and catalytic metal wire into a chamber; filling the chamber with hydrogen; reducing ambient pressure in the chamber below 1 atmosphere; sealing the chamber such that the ambient pressure in the chamber remains below 1 atmosphere and the hydrogen is contained within the sealed chamber and there is no flow of gas in or out during diamond deposition; and passing electric current through the graphite rod until the substrate is heated within a range of 125° C.–750° C. thereby forming precursors for said diamond deposition and depositing diamond on said substrate.