Patent ID: 6042880
Filing Date: 2000-03-28
Classification: C23C,F01D,Y02T,Y10T

Abstract:
A method for renewing a thermal barrier coating (TBC) system on an article surface, the system comprising a metallic bond coat on the article surface and an outer ceramic TBC, comprising the steps of:removing the outer ceramic to expose a bond coat substrate;selecting from a thermal pattern, unique to the article surface from service operation, at least one discrete local surface area of the article surface subject to bond coat degradation during service operation;applying to the exposed bond coat substrate at least at the discrete local surface area at least one renewal metal selected from the group consisting of Pt, Rh, and Pd;heating the renewal metal at a temperature and for a time sufficient to diffuse the renewal metal into the bond coat substrate;applying an environmental resistant coating selected from the group consisting of aluminides and alloys including aluminum to at least the discrete local surface area over the renewal metal; and then,applying an outer ceramic to the article surface.