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US 11,970,953 B2Granted
Slurry based diffusion coatings for blade under platform of internally-cooled components and process therefor
AssigneeRtx Corporation
InventorMichael N. Task
Life of this patent
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Abstract
A component includes a diffusion coating comprising an inter-diffusion zone between the diffusion coating and a substrate and a non-metallic inclusions zone adjacent to an outer surface of the diffusion coating. A method of coating a component includes applying an aluminizing slurry to a localized area of a component and applying a chromizing slurry to the localized area of the component subsequent to heat treating the aluminizing slurry.
Claims10
A component, comprising:
- a substrate;
- and
- a diffusion coating on a localized area of the substrate comprising an inter-diffusion zone at an interface between the diffusion coating and the substrate, the diffusion coating further comprising a non-metallic inclusions zone adjacent to an outer surface of the diffusion coating, wherein the diffusion coating is a Cr-enriched γ-Ni based layer with a Cr content of 20 wt. % minimum and Al content of 4 wt. % minimum and a thickness of between 1-3 mils (thousandth of an inch (0.0254-0.0762 mm)), and wherein the interdiffusion zone comprises elongated refractory element-rich particles, wherein the Cr content and the Al content are distributed through the diffusion coating such that a single diffusion coating layer contains the Cr content and the Al content, wherein the localized area of the substrate is an under-platform of a rotor blade and comprises at least one pocket and cooling holes, and wherein the diffusion coating is applied over the at least one pocket.
A rotor blade for a gas turbine engine, comprising:
- an airfoil;
- a root;
- a platform that comprises a gas path side adjacent to the airfoil and a non-gas path side adjacent to the root;
- and
- a diffusion coating on the non-gas path side of the platform, the diffusion coating comprising a Cr-enriched γ-Ni based layer with a Cr content of 20 wt. % minimum and Al content of 4 wt. % minimum having an inter-diffusion zone at an interface between the diffusion coating and the platform, the diffusion coating further comprising a non-metallic inclusions zone adjacent to an outer surface of the diffusion coating, wherein the interdiffusion zone comprises elongated refractory element-rich particles, wherein the Cr content and the Al content are distributed through the diffusion coating such that a single diffusion coating layer contains the Cr content and the Al content, wherein the platform and the root define at least one pocket on the non-gas path side of the platform, and cooling holes, and wherein the diffusion coating is applied over the at least one pocket.
2 more elements
Dependencies are inferred from the claim text.