| 摘要 |
PURPOSE: A method for protecting nickel-base articles, particularly the internal surfaces of gas turbine airfoils with aluminum-alloy surface protective layers is provided. CONSTITUTION: The method for protecting a surface of an article comprises the steps of furnishing an article made of a nickel-base alloy; providing a donor alloy comprising aluminum and at least one other element; applying the donor alloy onto a protected surface of the article, the step of applying including the steps of contacting the donor alloy to the protected surface of the article, and heating the article and the donor alloy to a coating temperature that is greater than about 0.7 of the absolute solidus temperature of the donor alloy but is such that the donor alloy remains in the form of a condensed phase contacting the protected surface of the article; and interdiffusing the donor alloy into the protected surface of the article. The method for protecting a surface of an article comprises the steps of furnishing an article made of a nickel-base alloy and having an internal passage in communication with an exterior of the article, the internal passage having an internal protected surface(60); providing a donor alloy comprising aluminum and at least one other element(62); applying the donor alloy onto the internal protected surface of the article(64), the step of applying(64) including the steps of contacting the donor alloy to the internal protected surface of the article(66), and heating the article and the donor alloy to a coating temperature that is greater than about 0.7 of the absolute solidus temperature of the donor alloy but is such that the donor alloy remains in the form of a condensed phase contacting the protected surface of the article(68); and interdiffusing the donor alloy into the internal protected surface of the article(70), wherein the article further comprises an external surface, and wherein the method includes an additional step of applying an external protective coating to the external surface(72).
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