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AssigneeGeneral Electric Company
InventorsGeorge A. Coffinberry, John F. Ackerman
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Articles for hot hydrocarbon fluid wherein the surface for contacting the fluid is a metal oxide, amorphous glass or metal fluoride diffusion barrier material coated on a metal substrate. The metal oxide, amorphous glass or metal fluoride is deposited by chemical vapor deposition (CVD), e.g., by effusive CVD of an organometallic compound on the surface without the use of carrier gas, without pre-oxidation of the surface and without thermal decomposition of the diffusion barrier coating material. Examples of coating materials deposited by effusive CVD are SiO.sub.2, TiO.sub.2, spinel and Al.sub.2 O.sub.3. The articles having the coated surfaces find utility in components subjected to high temperatures wherein the components are in contact with hydrocarbon fluids without additives, without special attention to quality control and without the need for special processing.
A method for preventing the deposit on a metal surface of thermal degradation products selected from metal sulfides, oxides or mixtures thereof, derived from the reaction of sulfur, oxygen or mixtures thereof in hydrocarbon fluid with metal atoms which diffuse to the metal surface, the method comprising the steps of processing the metal surface to be clean and oxide-free, and then applying to the clean and oxide-free metal surface a diffusion barrier coating comprising a dense, non-reactive, non-catalytic and thermally stable metal oxide, amorphous glass, or mixture thereof, said metal oxide, amorphous glass, or mixture thereof being applied by chemical vapor deposition from an organometallic precursor vapor without use of a carrier gas.
A method for preventing surface reaction which result in formation of deposits from hot hydrocarbon fluids in contact with an iron-, nickel-, or chromium-containing metal surface, the method comprising the steps of processing the metal surface to be clean and oxide-free, and then depositing on the oxide-free metal surface a smooth, continuous, dense, non-reactive, non-catalytic and thermally stable diffusion barrier coating comprising a metal oxide, amorphous glass or mixtures thereof, by chemical vapor deposition from an organometallic precursor vapor without use of a carrier gas.
An article of manufacture for contact with hot hydrocarbon fluid at a temperature above about 300.degree. F. and having an iron-, nickel-, or chromium-containing metal surface in which the metal surface is free of a formed metal oxide and has thereon an applied smooth, continuous, dense, non-reactive, non-catalytic and thermally stable diffusion barrier coating consisting of a metal oxide, amorphous glass or mixtures thereof, which substantially prevents diffusion of metal atoms and the hydrocarbons fluid through the diffusion barrier coating.
Dependencies are inferred from the claim text.