Method for refurbishing a coating including a thermally...

C - Chemistry – Metallurgy – 23 – G

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Details

C23G 1/02 (2006.01) C23C 10/02 (2006.01) C23C 10/48 (2006.01) F01D 5/14 (2006.01)

Patent

CA 2370256

A method is provided for refurbishing a service operated metallic coating (12) on a substrate alloy (10), the coating (12) including at least within a coating outer surface (16) at least one oxide (14) chemically grown from at least one coating element, for example Al, and chemically bonded with the coating outer surface (16) as a result of thermal exposure during service operation. Growth of the oxide (14) has depleted at least a portion of the coating element from the coating (12). The method comprises removing the oxide (14) from the coating outer surface (16) while substantially retaining the metallic coating (12), thereby exposing in the coating outer surface (16) at least one surface void (18) that had been occupied by the oxide (14). The retained metallic coating (12) is mechanically worked, substantially without removal of the retained coating (12), to close the void (18), providing a treated metallic coating surface (20) over which a refurbishing coating (22) is applied. In one form, the mechanical working provides, concurrently, a compressive stress in the substrate alloy (10) beneath the metallic coating (12).

Méthode pour remettre à neuf un revêtement métallique (12) utilisé sur un alliage de substrat (10), le revêtement (12) comprenant au moins à l'intérieur d'une surface externe de revêtement (16) au moins un oxyde (14) chimiquement cultivée à partir d'au moins un élément de revêtement, par exemple Al, et chimiquement lié à la surface externe de revêtement (16) à la suite d'une exposition thermique durant une opération de service. La croissance de l'oxyde (14) épuise au moins une partie de l'élément de revêtement à partir du revêtement (12). La méthode comprend l'élimination de l'oxyde (14) à partir de la surface externe de revêtement (16) tout en conservant sensiblement le revêtement métallique (12), exposant ainsi dans la surface externe de revêtement (16) au moins un vide de la surface (18) qui était occupé par l'oxyde (14). Le revêtement métallique retenu (12) est mécaniquement usiné, sensiblement sans éliminer le revêtement retenue (12), pour fermer l'espace vide (18), ce qui fournit une surface de revêtement métallique traitée (20) sur laquelle un revêtement de remise à neuf (22) est appliquée. Dans un mode de réalisation, le travail mécanique concerne, simultanément, une contrainte de compression dans l'alliage de substrat (10) sous le revêtement métallique (12).

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