Oxidation-resistant coatings bonded to metal substrates, and related articles and processes
OwnerWayne Haszinventor
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Abstract
An article is described, which includes a metal-based substrate and an oxidation-resistant coating bonded to the substrate by a bonding agent, such as a braze material. The oxidation-resistant coating material is often an aluminide- or MCrAlX-type coating, and can be one which contains relatively high amounts of aluminum. The coating is often very smooth, for maximum aerodynamic efficiency. The oxidation-resistant coating can be applied and bonded to the substrate by a variety of methods, using slurries, braze tapes, or metal foils. Coating repair methods are also described.
Claims36
An article comprising:
- (a) a metal-based substrate;
- and
- (b) an oxidation-resistant coating bonded to the substrate by a bonding agent.
A turbine engine component comprising a superalloy material, and including an oxidation-resistant coating bonded to at least a portion of a surface of the component, wherein the coating comprises an aluminide material or an alloy of the formula MCrAlX, where M is selected from the group consisting of Fe, Ni, Co, and mixtures of any of the foregoing;
- and where X is selected from the group consisting of Y, Ta, Si, Hf, Ti, Zr, B, C, and combinations thereof.
A method for applying an oxidation-resistant coating on a metal-based substrate, comprising the following steps:
- (i) applying the oxidation-resistant coating in the form of a slurry or a sheet to the substrate;
- and then
- (ii) fusing the oxidation-resistant coating to the substrate with a bonding agent.
A method for replacing an oxidation-resistant coating applied over a metal-based substrate, comprising the following steps:
- (I) removing the existing oxidation-resistant coating from a selected area on the substrate;
- (II) applying a new oxidation-resistant coating, in the form of a slurry or a sheet, to the selected area on the substrate;
- and then
- (III) fusing the new oxidation-resistant coating to the substrate with a bonding agent.
Dependencies are inferred from the claim text.