Office National D'etudes Et De Recherches Aerospatiales

Snecma Moteurs

Serge Alperine

Pierre J Josso

Odile Lavigne

Pierre Steinmetz

R&eacute;my Mevrel

Anne Constantini-Friant

V&eacute;ronique Arnault

A low thermal conductivity heat barrier composition, particularly for a superalloy article, is disclosed comprising a zirconia base and a dysprosium oxide having the dual function of stabilizing the zirconia and reducing the thermal conductivity thereof. Optionally, the composition also comprises a metal oxide containing a quadrivalent metallic ion selected from the group consisting of hafnium dioxide, cerium dioxide, uranium dioxide, and mixtures thereof.

Heat barrier composition, a mechanical superalloy article provided with a ceramic coating having such a composition, and a method of making the ceramic coating

Process for the assembly of ceramic and refractory alloy parts

A surface layer of a material containing carbon and/or a carbide is produced on the outer surface of a solid carbon-based substrate (1) by selective application of material, said surface layer adhering strongly to the substrate, having a high specific surface area and having open pores (5) of a depth of at least 1 nm, and a metal material having a strong affinity for carbon, comprising at least one metal chosen from cerium, cobalt, chromium, iron, hafnium, iridium, osmium, palladium, platinum, rhodium, ruthenium, lanthanum, manganese, molybdenum, nickel, silicon, tantalum, thorium, titanium, uranium and tungsten, is deposited on said surface layer, substantially filling said pores. The metal deposit (8) may be rectified and polished without peeling off, in order to produce a mirror of low inertia.

Method for producing an adherent metal deposit on carbon, and mirror

The bath contains an oxalate of the metal or of each of the metals to be deposited and hydrazine as a reducing agent, together with ethylenediamine as a complexing agent and at least one stabilizing agent, said bath being highly basic and having an autocatalytic effect.

Hydrazine bath for chemical deposition of platinum and/or palladium, and

A method including aluminization treatment preceded by a palladium predeposition treatment, the palladium being associated with at least one barrier metal selected from nickel, cobalt, and chromium, thereby avoiding hydrogen occlusion.

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Paris, France

Serge Alperine