Method of depositing a local MCrAIY-coating

Abstract

It is disclosed a method of depositing a MCrAlY-coating ( 6 ) on the surface ( 5 ) of a single crystal (SX) or directionally solidified (DS) article ( 1 ), wherein the article ( 1 ) is coated only at a local area by an electroplated method.

1 . A method of depositing a MCrAlY-coating ( 6 ) on the surface ( 5 ) of a single crystal (SX) or directionally solidified (DS) article ( 1 ), the method comprising the steps of coating the article ( 1 ) only at a local area with the MCrAlY-coating ( 6 ) by an electroplated method.  
     
     
         2 . The method according to  claim 1 , wherein during step (a) of the  claim 1 , the article ( 1 ) is coated locally with a γ/γ′ or with a γ/β coating.  
     
     
         3 . The method according to  claim 1  or  2 , wherein the step of coating the article ( 1 ) only at a local area with the MCrAlY-coating ( 6 ) by an electroplated method is repeated at different local areas on the surface ( 5 ) of the article ( 1 ).  
     
     
         4 . The method according to any of the  claims 1  to  3 , wherein during the step of coating the article ( 1 ) only at a local area with the MCrAlY-coating ( 6 ) by an electroplated method the areas not to be coated are masked with a masked material.  
     
     
         5 . The method according to  claim 4 , wherein the areas not to be coated are masked with wax or organic polymers.  
     
     
         6 . The method according to any of the  claims 1  to  5 , wherein different areas are coated with different MCrAlY-coatings, the MCrAlY-coatings are selected according to the required properties in said areas in respect to one or a combination of oxidation, corrosion, thermal mechanical fatigue (TMF).  
     
     
         7 . The method according to any of the  claim 1  to  8 , wherein the method is used as a repair process for a used MCrAlY-coating ( 6 ).  
     
     
         8 . The method according to any of the  claims 1  to  9 , wherein a gas turbine article ( 1 ) such as blades or vanes is coated.