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

Other

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

Societe Sochata

Snecma Moteurs-snecma Services

Snecma

Jean-Paul Fournes

Rene J Morbioli

Jacques Louis Leger

Pierre J Josso

Robert Lucien Martinou

Yann Philippe Jaslier

Jacques Lesgourgues

Andre Hubert Malie

Serge Alexandre Alperine

Denis Georges Manesse

Guillaume Oberlaender

Bruno Gilles François Boucard

Louis Jacques Leger

Catherine Marie-Hélène Richin

André Hubert Louis Malie

Alexandre Serge Alperine

Catherine Richin

Frédéric Yves Pierre Jacquot

Guillaume Roger Pierre Oberlaender

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 process for producing a coating for protecting superalloy articles against high temperature oxidation and hot corrosion comprises forming, on the surface of the article, a first deposit of an agglomerated powdered alloy containing at least chromium, aluminum and an active element, and filling the open pores of the powder deposit by a second, electrolytically applied, deposit of a precious platinum group metal. An appropriate thermal treatment is then carried out to effect interdiffusion between the powder based deposit and the electrolytic deposit and produce a coating including chromium, an active element such as yttrium, and a precious platinum group metal throughout its thickness.

Process for producing a coating for providing superalloys with highly efficient protection against high-temperature corrosion, a protective coating formed by the process, and articles protected by the coating

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

In a process for the simultaneous deposition of a protective coating, e.g. an aluminuim based coating, on internal and external surfaces of heat-resistant alloy parts, the parts are placed in a box containing a donor material, preferably in the form of granules, comprising the metal to be deposited, and an activator separate from the donor and comprising at least an anhydrous powder of chromium fluoride CrF.sub.3 to provide a source of fluorine. The box is heated to a temperature above 1000.degree. C. and a controlled flow of a carrier gas, reducing or neutral, is introduced into the box so as to establish a circulation of gases in the box whereby fluorinated vapors from thermal decomposition of the CrF.sub.3 activator contact the donor to form a volatile fluoride of the metal to be deposited, and the volatile vapor is carried into contact with the external and internal surfaces of the parts to be coated to deposit the coating thereon.

Process and apparatus for the simultaneous deposition of a protective

In a process for the simultaneous deposition of a protective coating, e.g. an aluminium based coating, on internal and external surfaces of heat-resistant alloy parts, the parts are placed in a box containing a donor material, preferably in the form of granules, comprising the metal to be deposited, and an activator separate from the donor and comprising at least an anhydrous powder of chromium fluoride CrF.sub.3 to provide a source of fluorine. The box is heated to a temperature above 1000.degree. C. and a controlled flow of a carrier gas, reducing or neutral, is introduced into the box so as to establish a circulation of gases in the box whereby fluorinated vapors from thermal decomposition of the CrF.sub.3 activator contact the donor to form a volatile fluoride of the metal to be deposited, and the volatile vapor is carried into contact with the external and internal surfaces of the parts to be coated to deposit the coating thereon.

The instant invention describes a method of repairing heat-resistant alloy parts which have been cracked or otherwise damaged due to exposure of combustion gases from a turbojet engine. The method includes chemically cleaning the surface of the part to remove the layer of contaminants and subjecting the part to a thermochemical treatment to thoroughly clean the cracks and other narrow, damaged areas. A diffusion brazing process is then utilized to fill the cracks or damaged areas.

Method of repairing heat resistant alloy parts

Growing community of inventors

Dannemois, France

Jean-Paul Fournes