Patent ID: 6551423
Filing Date: 2003-04-22
Classification: C23C,Y02T

Abstract:
A method for preparing an article having a substrate protected by an overlying coating, comprising the steps offurnishing a substrate comprising a nickel-base superalloy; thereafter depositing a first layer comprising platinum contacting an upper surface of the substrate; thereafter depositing a second layer comprising aluminum contacting an upper surface of the first layer, leaving an exposed surface; and thereafter final desulfurizing the article by removing sulfur initially in the substrate to yield an article with a final-desulfurized exposed surface, the step of final desulfurizing including the steps of heating the article to a final desulfurizing elevated temperature of from about 1800Â° F. to about 1975Â° F. in an atmosphere of a reducing gas, and thereafter removing a layer of sulfur-concentrated material from the exposed surface of the article.