Abstract: The invention relates to a method of overall repair for a part (1) coated in a thermal barrier constituted by a ceramic outer layer (5) and a metal underlayer (3) of alumina-forming alloy, the method being characterized by the following steps: a) subjecting the metal part (1) for repair to thermochemical treatment under fluorine-containing halogen gas for a length of time that is sufficient to eliminate the aluminum contained in the underlayer (3) and any oxides and sulfur compounds that might be present at the surface of the part (1) and in cracks (6), thereby causing the ceramic layer (5) to be removed and causing the part (1) to be passivated; b) restoring mechanical integrity to the part (1) by methods of repairing any cracks (6) by adding material; c) enriching the surface of the part in aluminum, if necessary; and d) depositing a new layer (5) of ceramic. The invention is particularly applicable to the blades of the high pressure turbine of a turbomachine.

Abstract: A thermal barrier coating for a superalloy part used, in particular, in turbomachines comprises a ceramic coating and a sub-layer interposed between the superalloy substrate and the ceramic coating, the sub-layer being composed of a nickel and/or cobalt aluminide containing at least one platinum-like metal and at least one metal for promoting the formation of a layer of oxide constituted by the alpha-allotropic variety of alumina.