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AssigneesONERA (Office National d'Etudes et de Recherches Aerospatiales), Snecma Moteurs
InventorsMarie-Pierre Bacos, Pierre Josso, Serge Naveos
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This relates to an improvement to the process of aluminization or activated cementation in which a donor cement containing the aluminium is attacked at high temperature and in a neutral or reducing atmosphere by a gaseous ammonium halide to form a gaseous aluminium halide which decomposes on contact with a nickel-based substrate depositing aluminium metal thereon. According to the invention the aluminium halide is at least partly replaced by a zirconium halide leading to the inclusion of zirconium in the deposit. Improvement in the protection of the hot parts of aircraft engines made of nickel-based superalloy. No figure is to be published.
Process for forming a protective coating containing aluminium on the surface of a nickel-based superalloy in which the nickel-based superalloy and a non-gaseous precursor containing aluminium are placed in contact, at a treatment temperature sufficient for stoichiometric coating, with a reducing or inert atmosphere containing an active gas which reacts with the precursor to form a gaseous aluminium compound which decomposes on contact with the nickel-based superalloy depositing aluminium metal thereon, characterised in that the reducing or inert atmosphere contains a gaseous compound of a modifier metal which decomposes on contact with the nickel-based superalloy and deposits the modifier metal thereon simultaneously with the deposition of aluminium, wherein the gaseous compound of the modifier metal is zirconium oxychloride such that zirconium metal is deposited simultaneously with the deposition of aluminum.
A method for forming a protective coating containing aluminium on a surface of a nickel-based superalloy, the method comprising:
Dependencies are inferred from the claim text.