Patent ID: 6794059
Filing Date: 2004-09-21
Classification: C23C,Y02T,Y10T

Abstract:
An article resistant to attack from environmental contaminants under high temperature conditions, the article being of the type comprising a metal alloy part, a thermal barrier coating deposited onto the metal alloy part, and a protective top coat of a material different from the material of the thermal barrier coating deposited onto the thermal barrier coating, characterized in that:the top coat is non-sacrificial; the top coat is porous; the top coat is substantially thinner than the thermal barrier coating; the top coat is a material selected from the group consisting of carts stabilized zirconia (CSZ); calcium-stabilized zirconia (CaSZ); zirconia toughened alumina (ZTA); a compound oxide comprising two or more compounds from the group consisting of oxides of aluminum, cobalt, chromium, iron, titanium and nickel and mixtures of two or more thereof; and the top coat is selected from materials more resistant to the environmental contaminants than the thermal barrier coating.