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US 11,873,569 B2Granted
Coating for internal surfaces of an airfoil and method of manufacture thereof
AssigneeRtx Corporation
InventorsLei Chen, Lesia V. Protsailo, Michael N. Task
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Abstract
Disclosed herein is a method of coating, comprising providing an article having an internal passage therein to be coated; electrolytically applying a first layer that comprises chromium or a chromium alloy onto a surface of the internal passage; electrolytically applying a second layer comprising aluminum or an aluminum alloy onto the first layer; and heat treating the article to promote interdiffusion between the first layer and the second layer.
Claims15
An airfoil comprising:
- an internal surface having disposed thereon:
- a thermally grown oxide layer that comprises alumina and chromium oxide;
- and
- a layer comprising Ni—Cr/aluminide or Cr/aluminide disposed between the layer comprising alumina and chromium oxide and the internal surface of the airfoil;
- where the layer comprising Ni—Cr/aluminide or Cr/aluminide contains aluminum and chromium that vary in amount inversely with one another with distance from the internal surface of the airfoil or from a surface of the thermally grown oxide layer.
2 more elements
Dependencies are inferred from the claim text.