Method for improving resistance to cmas infiltration

C - Chemistry – Metallurgy – 23 – C

Patent

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C23C 4/08 (2006.01)

Patent

CA 2709931

Methods for providing improved resistance to CMAS infiltration for hot section components of a gas turbine engine. Exemplary methods include coating a substrate with a thermal barrier coating system by overlying a bond coated substrate with an inner thermal barrier layer comprised of a thermal barrier material such as yttria-stabilized zirconia. A top layer, including a rare-earth aluminate, is deposited so as to overlie at least a portion of the inner layer. Deposition processes and coating thicknesses may be tailored to the type of component to be coated.

L'invention concerne des procédés destinés à améliorer la résistance à l'infiltration de CMAS des composants de la partie chaude d'un moteur de turbine à gaz. Des procédés consistent, à titre d'exemple, à recouvrir un substrat avec un système de recouvrement à barrière thermique en recouvrant un substrat de liaison d'une couche à barrière thermique interne faite d'un matériau de barrière thermique tel qu'une zircone stabilisée à l'yttrium. Une couche supérieure comprenant un aluminate des terres rares est déposée de manière à recouvrir au moins une partie de la couche interne. Les processus de dépôt et les épaisseurs de revêtement peuvent être adaptés en fonction du type de composant destiné à être revêtu.

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