Method for selective aluminide diffusion coating removal
AssigneeGeneral Electric Company
InventorsLiming Zhang, Jere A. Johnson, Ying Zhou
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Abstract
A method for selective aluminide diffusion coating removal. The method includes diffusing aluminum into a substrate surface of a component to form a diffusion coating. The diffusion coating includes an aluminum-infused additive layer and an interdiffusion zone. The diffusion coating is solution heat treated at a temperature and for a time sufficient to dissolve at least a portion of the interdiffusion zone. Thereafter the aluminum-infused additive layer is selectively removed. An aluminide diffusion coated turbine component is also disclosed.
Claims20
A method for selective aluminide diffusion coating removal, the method comprising:
- diffusing aluminum into a substrate surface of a component to form a diffusion coating, the diffusion coating comprising an aluminum-infused additive layer and an interdiffusion zone;
- solution heat treating the diffusion coating under vacuum at a temperature and for a time sufficient to dissolve at least a portion of the interdiffusion zone;
- and thereafter
- selectively removing the aluminum-infused additive layer.
A method for aluminide diffusion coating removal from a substrate of a gas turbine component, the method comprising:
- removing the component from a gas turbine after operation of the gas turbine, the component having a diffusion coating, the diffusion coating comprising an aluminum-infused additive layer and an interdiffusion zone;
- solution heat treating the diffusion coating under vacuum at a temperature and for a time sufficient to dissolve at least a portion of the interdiffusion zone;
- and thereafter
- selectively removing the aluminum-infused additive layer.
An aluminide diffusion coated turbine component comprising:
- a substrate comprising a nickel-based or cobalt-based superalloy;
- and
- an aluminide diffusion coating on a surface of the substrate, the aluminide diffusion coating having a dissolved interdiffusion zone, the dissolved interdiffusion zone being a zone in which at least a portion of a preexisting interdiffusion zone is dissolved into the substrate under vacuum,
- wherein an aluminum-infused additive layer has been selectively removed from the aluminum diffusion coating, and,
- wherein the dissolved interdiffusion zone is resistant to removal relative to an aluminum-infused additive layer of a comparative aluminide diffusion coating which is identical to the aluminide diffusion coating except that the preexisting interdiffusion zone is not dissolved into a comparative substrate and an aluminum-infused additive layer has not been selectively removed.
Dependencies are inferred from the claim text.