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US 5,254,359 AGranted
Method of forming titanium nitride coatings on carbon/graphite substrates by electric arc thermal spray process using titanium feed wire and nitrogen as the atomizing gas
AssigneeAir Products and Chemicals, Inc.
InventorsZbigniew Zurecki, Edward A. Hayduk, Jr., John G. North, Robert B. Swan, David L. Mitchell, Jr.
Life of this patent
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Abstract
Graphite and/or carbon surfaces are coated with a titanium nitride coating by exposing the substrate to electric arc thermal spray process wherein titanium wire as the source of titanium and nitrogen is used as the propelling (atomizing) gas.
Claims14
A method of improving the high temperature oxidation and mechanical wear resistance of a carbon or graphite substrate comprising the steps of:
- exposing said substrate without preheating and without being confined in a pressure or atmosphere controlled chamber to the effluent from an electric arc thermal spray gun using titanium wire and nitrogen gas as the atomizing/propelling gas, whereby a substantially titanium nitride electrically conductive coating having a titanium to nitrogen ratio of between 1 and 2 is produced on said substrate.
A method of improving the high temperature oxidation and mechanical wear resistance of a carbon or graphite substrate comprising the steps of:
- exposing said substrate without preheating and without being confined in a pressure or atmosphere controlled chamber to the effluent from an electric arc thermal spray gun using a titanium wire and a wire of pure metal or pre-alloyed metal capable of forming a protective oxide coating and nitrogen gas as the atomizing/propelling gas, whereby a titanium nitride and titanium metal or titanium pre-alloyed electrically conductive coating is produced on said substrate.
Dependencies are inferred from the claim text.