Gas turbine airfoil protected by aluminide and platinum aluminide coatings, and its preparation
AssigneeGeneral Electric Company
InventorsRoger D. Wustman, Antonio F. Maricocchi, Jonathan P. Clarke
Life of this patent
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Abstract
A gas turbine component article has an airfoil section and is formed of a nickel-base superalloy. An unmasked region of the airfoil section has a platinum aluminide protective coating, and a masked region of the airfoil section has an aluminide coating. The platinum aluminide preferably is deposited at a trailing edge of the airfoil section that is susceptible to low-cycle fatigue damage when a platinum aluminide coating is present.
Claims16
A method for preparing an article protected by an aluminide coating, comprising:
- furnishing a component article of a gas turbine having an airfoil section, the component comprising a nickel-base superalloy;
- masking a masked portion of the airfoil section, leaving an unmasked portion of the airfoil section;
- depositing a noble metal onto the airfoil section as a substrate, the result being the unmasked portion having the noble metal layer thereon and the masked portion having no noble metal layer thereon;
- removing the mask;
- and
- depositing an aluminum-containing layer onto the airfoil section of the article.
A method for preparing an article protected by an aluminide coating, comprising:
- furnishing a component article of a gas turbine having an airfoil section, the component comprising a nickel-base superalloy;
- identifying an area of the airfoil section that is potentially subject to mechanical property degradation in the event that a coating is present;
- masking a masked portion of the airfoil section which includes the area that is potentially subject to mechanical property degradation, leaving an unmasked portion of the airfoil section;
- depositing a layer of platinum onto the airfoil section as a substrate, the result being the unmasked portion having the platinum layer thereon and the masked portion having no platinum layer thereon;
- removing the mask;
- and
- depositing an aluminum-containing layer onto the airfoil section of the article.
An article protected by an aluminide coating, comprising:
- a substrate in the form of a gas turbine component article having an airfoil section, the component comprising a nickel-base superalloy;
- a platinum aluminide coating in an unmasked region of the airfoil section;
- and
- an aluminide coating in a masked region and the unmasked region of the airfoil section.
Dependencies are inferred from the claim text.