Patent ID: 6444053
Filing Date: 2002-09-03
Classification: C23C,Y02T

Abstract:
A method for preparing a surface-protected nickel-base superalloy article, comprising the steps ofproviding an article substrate having a surface and having a nominal bulk composition comprising the nickel-base superalloy, the nickel-base superalloy comprising more nickel than any other element, reactive element selected from the group consisting of hafnium, zirconium, yttrium, lanthanum, and cerium, and combinations thereof, and a nominal bulk composition of carbon; and depositing a protective layer overlying the surface of the article substrate, the step of depositing a protective layer including steps of decarburizing locations where the carbon serves as a barrier to the diffusion of the reactive element from the substrate into the protective layer, and depositing an aluminum-containing protective layer overlying the substrate, wherein the step of decarburizing includes the step of decarburizing the substrate prior to the step of depositing the aluminum-containing protective layer.