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Snecma Moteurs

Snecma Moteurs-snecma Services

Societe Nationale D'etude Et De Construction De Monteurs D'aviation S.n.e.c.m.a. and Snecma Services

Yann Philippe Jaslier

Serge Alexandre Alperine

Jacques Louis Leger

Andr&eacute; Hubert Louis Malie

Jean-Pierre Julien Charles Huchin

Romain Portal

Jean-Paul Fournes

Alain Martinez

Yuri Tamarine

Frédéric Yves Pierre Jacquot

Marie-Christine Ntsama Etoundi

Bruno Gilles François Boucard

Guillaume Oberlaender

Catherine Marie-Hélène Richin

André Hubert Louis Malie

Guillaume Roger Pierre Oberlaender

Serge Gerzdev

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

The reactive element is introduced to the surface of the metal substrate in the form of an oxide powder and the aluminide-type coating is then formed.

Formation of an aluminide coating, incorporating a reactive element, on a metal substrate

A ceramic heat barrier coating is deposited on a substrate so that the coating has a columnar growth pattern which is interrupted and repeated a number of times throughout its thickness by successive regermination of the ceramic deposit. The regermination is obtained by a vapor phase deposition process wherein a polluting gas is introduced intermittently during the deposition of the ceramic. The resulting ceramic coating has a lower thermal conductivity than conventional columnar ceramic coatings.

Ceramic heat barrier coating having low thermal conductivity, and process for the deposition of said coating

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 low thermal conductivity heat barrier coating deposited on a superalloy substrate is characterised in that it comprises a homogeneous mixture of oxides and has a composition containing a zirconia base, a zirconia-stabilizing oxide, and from 0.5 to 12 weight % of an additional metal element selected from nickel, cobalt, iron and mixtures thereof. The additional metal element may be added in an oxidised form, and the coating may also contain from 0.01 to 1 weight % of carbon.

Low thermal conductivity heat barrier coating, a metal article having such a coating, and a process for depositing the coating

A ceramic heat barrier coating is deposited on a substrate so that the coating has a columnar growth pattern which is interrupted and repeated a number of times throughout its thickness by successive regermination of the ceramic deposit. The regermination is obtained by a vapour phase deposition process wherein a polluting gas is introduced intermittently during the deposition of the ceramic. The resulting ceramic coating has a lower thermal conductivity than conventional columnar ceramic coatings.

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Melun, France

Yann Philippe Jaslier