Anti-erosion coating system for gas turbine components

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 28/00 (2006.01) C23C 30/00 (2006.01) F01D 5/28 (2006.01)

Patent

CA 2753268

The present invention relates to a gas turbine component made of a basic material (1), on which an anti-erosion coating system is provided that comprises a multilayer system including at least one ductile metal layer and at least one hard, ceramics-containing layer for forming a partial anti-erosion system (3). At least one anti- corrosion layer (2) that has a lower electronic [sic, possible "electrochemical"] potential than the basic material is provided between the partial anti-erosion system (3) and the basic material (1), thus providing cathodic corrosion protection. The invention also relates to a method for producing a corresponding anti-erosion coating system, including the following steps: a) applying a cathodic anti-corrosion layer (2); b) applying a multilayer partial anti-erosion system (3) using physical vapor deposition (PVD).

L'invention concerne un composant de turbine à gaz composé d'un matériau de base (1) pourvu d'un système de revêtement de protection contre l'érosion, comportant un système multicouche constitué d'au moins une couche métallique ductile, et d'au moins une couche dure contenant de la céramique pour former un système de protection partiel contre l'érosion (3). Au moins une couche anticorrosion (2) est prévue entre le système de protection partiel contre l'érosion (3) et le matériau de base (1), la couche anticorrosion présentant un potentiel électrique inférieur à celui du matériau de base à revêtir, de manière à créer une protection anticorrosion cathodique. L'invention concerne également un procédé de fabrication d'un système de revêtement de protection contre l'érosion comportant les étapes suivantes: a) application d'une couche anticorrosion cathodique (2); et b) application d'un système de protection multicouche partiel contre l'érosion (3) par dépôt physique en phase vapeur (PVD, physical vapour deposition).

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