C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 18/16 (2006.01) C23C 18/34 (2006.01) C23C 18/44 (2006.01) F01D 5/28 (2006.01)
Patent
CA 2355695
The invention concerns a method comprising a step which consists in producing, on a precursor alloy powder containing at least the elements Cr, Al and Y, using a chemical or electrolytic deposition bath, a deposition containing at least a modifying element such as platinum, palladium, ruthenium or rhenium. The modifying element enhances the capacity of the coating to form from phase beta , by exposure to oxygen at high temperature, an adhesive alumina surface barrier. The invention is useful for protecting against corrosion and oxidation at high temperatures aviation turbine blades.
Le procédé comprend l'étape consistant à réaliser, sur une poudre d'un alliage précurseur contenant au moins les éléments Cr, Al et Y, en utilisant un bain de dépôt chimique ou électrolytique, un dépôt contenant au moins un élément modificateur tel que le platine, le palladium, le ruthénium ou le rhénium. L'élément modificateur renforce l'aptitude du revêtement à former à partir de la phase .beta., par exposition à l'oxygène à température élevée, une barrière superficielle adhérente d'alumine. Application à la protection contre la corrosion et l'oxydation aux températures élevées des aubes de turbines aéronautiques.
Bacos Marie Pierre
Josso Pierre
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Onera (office National D'etudes Et de Recherches Aerospatiales)
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