High temperature coatings for gas turbines

C - Chemistry – Metallurgy – 23 – C

Patent

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C23C 30/00 (2006.01) C23C 4/08 (2006.01) F01D 5/28 (2006.01)

Patent

CA 2418101

Coating for high temperature gas turbine components that include a MCrAlX phase, and an aluminum-rich phase, significantly increase oxidation and cracking resistance of the components, thereby increasing their useful life and reducing operating costs. The aluminum-rich phase includes aluminum at a higher concentration than aluminum concentration in the MCrAlX alloy, and an aluminum diffusion-retarding composition, which may include cobalt, nickel, yttrium, zirconium, niobium, molybdenum, rhodium, cadmium, indium, cerium, iron, chromium, tantalum, silicon, boron, carbon, titanium, tungsten, rhenium, platinum, and combinations thereof, and particularly nickel and/or rhenium. The aluminum-rich phase may be derived from a particulate aluminum composite that has a core comprising aluminum and a shell comprising the aluminum diffusion-retarding composition.

L'invention concerne des revêtements de composants de turbines à gaz à haute température comportant une phase MCrAIX et une phase riche en aluminium, qui augmentent de manière significative l'oxydation et la résistance à la fissuration des composants, ce qui permet d'augmenter leur durée de vie utile et de réduire les coûts d'exploitation. La phase riche en aluminium renferme de l'aluminium dont la teneur est supérieure à celle dans l'alliage MCrAIX, et une composition retardant la diffusion de l'aluminium, qui peut renfermer du cobalt, du nickel, de l'yttrium, du zirconium, du niobium, du molybdène, du rhodium, du cadmium, de l'indium, du cérium, du fer, du chrome, du tantale, du silicium, du boron, du carbone, du titane, du tungstène, du rhénium, du platine, et des combinaisons de ceux-ci, et en particulier du nickel et/ou du rhénium. La phase riche en aluminium peut être dérivée d'un composite d'aluminium particulaire dont le noyau comporte de l'aluminium et l'enveloppe la composition retardant la diffusion de l'aluminium.

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