Patent ID: 6482470
Filing Date: 2002-11-19
Classification: C23C,Y10T

Abstract:
In a method for making a coated article including applying a diffusion aluminide coating to a metallic substrate of the article, the coating comprising a coating outer portion of a first thickness and a coating diffusion portion of a second thickness between the coating outer portion and the substrate, the steps of:providing an Al source material including a total amount of at least about 40 weight % Al; and, conducting a diffusion aluminide coating method in a non-oxidizing atmosphere at a temperature in the range of about 1650Â° F. to no greater than about 1800Â° F. for a time sufficient to apply the coating outer portion to the metallic substrate and to control diffusion of the coating outer portion into the substrate to provide the coating diffusion portion to the second thickness at no greater than about 60% of the first thickness and less than about 1 mil in thickness.