Method for applying coatings on substrates
AssigneeGeneral Electric Company
InventorsD. Sangeeta, Howard John Farr
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Abstract
A method for forming a metal-containing layer on a substrate is disclosed. A slurry of the metal is first deposited on the substrate; followed by heating to remove volatile material from the slurry, and to form a layer of the metal. In another embodiment, a slurry of aluminum is deposited over the slurry of the metal, before or after the metal has been heat-treated to some degree. A diffusion heat treatment results in a coating which includes the noble-metal aluminide compound. Related articles are also disclosed.
Claims33
A method for forming a noble metal-containing layer on a substrate, comprising the following steps:
- (a) depositing a slurry of the noble metal on the substrate;
- and
- (b) heating the noble metal slurry under temperature and time conditions sufficient to remove substantially all volatile material from the slurry, and to form a layer which comprises the noble metal;
- wherein the noble metal-containing layer further comprises aluminum, and the aluminum is obtained from an aluminum slurry deposited over the substrate after the deposition of the slurry of the noble metal.
A method for repairing a damaged or worn metal-aluminide coating applied over a substrate, comprising the following steps:
- (i) removing the damaged or worn coating from a selected area on the substrate;
- and then
- (ii) applying additional coating material over the selected area, by
- (I) depositing aluminum and a slurry of the metal on the selected area, in place of the coating removed in step (i);
- and
- (II) heating the aluminum and the slurry under temperature and time conditions sufficient to remove substantially all volatile material from the deposited aluminum and metal slurry, and to form a layer which comprises metal-aluminide on the selected area.
A method for forming a platinum-aluminide or palladium-aluminide layer on a superalloy substrate, comprising the following steps:
- (a) depositing a platinum or palladium slurry on the substrate;
- (b) heating the platinum or palladium slurry to a temperature high enough to remove substantially all volatile material from the slurry;
- (c) depositing an aluminum slurry over the platinum or palladium slurry;
- (d) heating the aluminum slurry to a temperature high enough to remove substantially all volatile material from the aluminum slurry;
- and then
- (e) heating the slurry coated substrate under diffusion treatment conditions sufficient to form a platinum-aluminide or palladium-aluminide layer over the substrate.
A method for forming a platinum-aluminide layer on a superalloy substrate, comprising the following steps:
- (a) depositing a platinum slurry on the substrate;
- (b) heating the platinum slurry to a temperature high enough to remove substantially all volatile material from the slurry;
- (c) depositing aluminum over the platinum slurry, by a diffusion heat treatment of aluminum vapor, under temperature and time conditions sufficient to form a platinum aluminide layer over the substrate.
Dependencies are inferred from the claim text.