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Societe Nationale D'etude Et De Construction De Moteurs D'aviation

Office National D'etudes Et De Recherche Aerospatiales (onera)

Societe Sochata

Snecma Moteurs-snecma Services

Jacques Louis Leger

Yann Philippe Jaslier

Serge Alexandre Alperine

Jean-Paul Fournes

Pierre J Josso

Andre Hubert Malie

André Hubert Louis Malie

Denis Georges Manesse

Guillaume Roger Pierre Oberlaender

Bruno Gilles François Boucard

Frédéric Yves Pierre Jacquot

Catherine Marie-Hélène Richin

A method of locally repairing parts coated with a thermal barrier including a ceramic outer layer and a metal underlayer of alumina-forming alloy for protecting the substrate against oxidation and for bonding with the ceramic outer layer, includes: defining the zone for repair with a mechanical mask adapted to the shape of the part and the zone for repair; scouring the zone for repair so as to remove the ceramic, the alumina layer, and the damaged portions of the underlayer; supplying materials for repairing the underlayer to the repair zone by subjecting the partially-scoured part to metal deposition by use of an electrical current; and subjecting the part to a heat treatment in order to enable the added metals to diffuse into the remaining underlayer in the repair zone for repair and to enable a surface film of alumina to form. After the underlayer has been reconstituted, the zone for repair is again defined by a mechanical mask and a new ceramic layer is deposited thereon.

Method of locally repairing parts covered with a thermal barrier

A method of improving the oxidation and corrosion resistance of a superalloy article comprises providing a superalloy substrate having a sulphur content which is less than 0.8 ppm by weight, and depositing on the substrate a protective antioxidation coating having a sulphur content also less than 0.8 ppm by weight. A heat barrier layer may also be provided by depositing on the protective anti-oxidation coating a ceramic coating of columnar structure.

Method of improving oxidation and corrosion resistance of a superalloy article, and a superalloy article obtained by the method

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.

Thermal barrier coating with improved sub-layer and parts coated with

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Combs la Ville, France

Jacques Louis Leger