Process for applying a protective layer

C - Chemistry – Metallurgy – 23 – C

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C23C 4/10 (2006.01) B01J 19/02 (2006.01) B32B 15/00 (2006.01) B32B 18/00 (2006.01) B32B 38/10 (2006.01) C23C 4/18 (2006.01) C23F 15/00 (2006.01)

Patent

CA 2517298

To protect a base metal layer (1) against high-temperature corrosion and high-temperature erosion, an adhesive layer (3) based on MCrAlY is applied to the base metal layer (1). The adhesive layer (3) is coated with an Al diffusion layer (4) by alitizing. The diffusion layer (4) is subjected to an abrasive treatment, so that the outer built-up layer (4,2) on the diffusion layer (4) prepared by alitizing is removed by the abrasive treatment. A ceramic heat insulation layer (2) consisting of zirconium oxide, which is partially stabilized by yttrium oxide, is applied to the diffusion layer (4) thus treated.

Pour protéger une couche métallique de base (1) contre la corrosion et l'érosion à haute température, une couche adhésive (3) formée de MCrAlY est appliquée sur la couche métallique de base (1). La couche adhésive (3) est recouverte, par calorisation, d'une couche par diffusion A1 (4). La couche de diffusion (4) est soumise à un traitement abrasif de sorte que la couche accumulée à l'extérieur (4,2) de la couche de diffusion (4) appliquée par calorisation est supprimée. Une couche d'isolation thermique de céramique (2), formée d'oxyde de zirconium partiellement stabilisée par oxyde d'yttrium, est appliquée à la couche de diffusion (4), puis traitée.

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