Method of depositing an oxidation and fatigue resistant MCrAIY-coating

Abstract

A method of depositing a layer ( 6 ) of highly oxidation and fatigue resistant MCrAlY-coating by an electroplated process has been described. A relative thin coating on an industrial gas turbine component was applied with a thickness control of ±20 μm of the thickness of the applied layer ( 6 ) on gas turbine articles ( 1 ). The said MCrAlY coatings comprise an addition of (wt.-%) 0.01 to 3% Fe. In addition to Fe the MCrAlY coatings may contain 0.5-2.5% Si, 0-1.5% Hf, 0.01-0.2% Zr and 0-2% Ta, alone or in combination.

1 . A method of depositing a layer of a MCrAlY-coating ( 6 ) on the surface ( 5 ) of an article ( 1 ), wherein the layer of the MCrAlY-coating ( 6 ) which comprises (wt.-%) 21-25% Co, 16-20% Cr, 8-12% Al, 0.01-0.5% Y, Rest Ni is deposited by an electroplated process.  
     
     
         2 . The method according to  claim 1 , wherein a layer of the MCrAlY-coating ( 6 ) which comprises (wt.-%) 23% Co, 18% Cr, 10% Al, 0.5% Y, Rest Ni is deposited by the electroplated process.  
     
     
         3 . The method according to  claim 1  or  2 , wherein a layer of the MCrAlY-coating ( 6 ) having a γ/β-microstructure is deposited.  
     
     
         4 . The method according to  claim 1  or  2 , wherein the deposited coating is heat-treated in vacuum, argon, hydrogen at 1140° C. for 2 to 12 hours.  
     
     
         5 . The method according to  claim 1  or  2 , wherein a layer of the MCrAlY-coating ( 6 ) comprising in addition (wt.-%) 0.01 to 3% Fe is deposited.  
     
     
         6 . The method according to  claim 1  or  2 , wherein a layer of the MCrAlY-coating ( 6 ) comprising in addition (wt.-%) 0.5-2.5% Si, 0-1.5% Hf, 0.01-0.2% Zr either alone or in combination is deposited.  
     
     
         7 . The method according to  claim 1  or  2 , wherein a layer of the MCrAlY-coating ( 6 ) comprising in addition (wt.-%) 0-2% Ta is deposited.  
     
     
         8 . The method according to  claim 1  or  2 , wherein a layer of the MCrAlY-coating ( 6 ) is deposited with a thickness control of ±20 μm of the thickness of the deposited layer ( 6 ).  
     
     
         9 . The method according to  claim 7 , wherein a layer of the MCrAlY-coating ( 6 ) having a thickness in the range of 25-400 μm is deposited.  
     
     
         10 . The method according to  claim 8 , wherein a layer of the MCrAlY-coating ( 6 ) having a thickness in the range of 25-300 μm is deposited.  
     
     
         11 . The method according to  claim 9 , wherein a layer of the MCrAlY-coating ( 6 ) having a thickness in the range of 25-100 μm is deposited.  
     
     
         12 . The method according to  claim 10 , wherein a layer of the MCrAlY-coating ( 6 ) having a thickness in the range of 25-50 μm is deposited.  
     
     
         13 . The method according to any of the  claim 1  to  11 , wherein a layer of the MCrAlY-coating ( 6 ) is deposited as overlay or bond coat under a layer of a ceramic coating ( 7 ).  
     
     
         14 . The method according to any of the  claims 1  to  12 , wherein a gas turbine article ( 1 ) such as blades or vanes is coated.