Method for producing a heat barrier covering a metal...

C - Chemistry – Metallurgy – 23 – C

Patent

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C23C 4/02 (2006.01) C23C 4/18 (2006.01) C23C 14/02 (2006.01) C23C 14/58 (2006.01) C23C 28/00 (2006.01)

Patent

CA 2757386

The invention relates to a method for producing a heat barrier covering a metal substrate made of a superalloy, said heat barrier including at least one sublayer and one ceramic layer, characterised in that the method comprises the following steps: rectifying the surface state of the sublayer using at least one physico-chemical and/or mechanical method before the deposition of the ceramic layer so that the number of defects having a space between the ridges lower than or equal to 2 µm does not exceed 5 over any 50 µm distance; and carrying out the deposition of the ceramic layer. The invention can be used for turbine blades.

L'invention concerne une méthode de fabrication d'une barrière thermique recouvrant un substrat métallique en superalliage, ladite barrière thermique comprenant au moins une sous-couche et une couche de céramique, caractérisée en ce que l'on met en oeuvre les étapes suivantes : on rectifie l'état de surface de la sous-couche par au moins un procédé physico-chimique et/ou mécanique avant d'effectuer le dépôt de la couche de céramique de sorte que le nombre de défauts présentant un écart entre les crêtes inférieur ou égal à 2 µm est au maximum de 5 sur toute distance de 50 µm, et on effectue le dépôt de la couche de céramique. Application à des aubes de turbine.

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