Combustor wall with metallic coating on cold side

Abstract

A combustor includes a combustion chamber and a combustor wall that at least partially bounds the combustion chamber. The combustor wall includes a first side that faces the combustion chamber and a second side that faces away from the combustion chamber. The second side includes an array of geometric surface features for thermal transfer. A metallic coating is disposed on at least a portion of the second side of the combustor wall.

What is claimed is: 
     
         1 . A combustor comprising:
 a combustion chamber;   a combustor wall at least partially bounding the combustion chamber, the combustor wall including a first side facing the combustion chamber and a second side facing away from the combustion chamber, the second side including an array of geometric surface features for thermal transfer; and   a metallic coating disposed on at least a portion of the second side of the combustor wall.   
     
     
         2 . The combustor as recited in  claim 1 , wherein the combustor wall includes an array of through-holes. 
     
     
         3 . The combustor as recited in  claim 1 , wherein the metallic coating is continuous and fully covers one or more of the geometric surface features. 
     
     
         4 . The combustor as recited in  claim 1 , wherein the metallic coating partially covers one or more of the geometric surface features. 
     
     
         5 . The combustor as recited in  claim 1 , wherein the metallic coating has a first coating surface that is in contact with the second side of the combustor wall and a second coating surface that is a free surface. 
     
     
         6 . The combustor as recited in  claim 1 , wherein the combustor wall is formed of a nickel-based alloy and the metallic coating is MCrAlY, where the M includes at least one of nickel, cobalt and iron, Cr is chromium, Al is aluminum, and Y is yttrium. 
     
     
         7 . The combustor as recited in  claim 1 , further comprising a ceramic thermal barrier coating disposed on the first side. 
     
     
         8 . The combustor as recited in  claim 7 , further comprising a bond coat between the ceramic thermal barrier coating and the first side. 
     
     
         9 . The combustor as recited in  claim 1 , wherein the metallic coating has a thickness of 0.005-0.01 inches (127-254 micrometers). 
     
     
         10 . The combustor as recited in  claim 1 , wherein the geometric surface features are surface protrusions. 
     
     
         11 . The combustor as recited in  claim 1 , wherein the combustor wall includes an array of through-holes, the metallic coating at least partially covers one or more of the geometric surface features and has a first coating surface that is in contact with the second side of the combustor wall and a second coating surface that is a free surface, the combustor wall is formed of a nickel-based alloy and the metallic coating is MCrAlY, where the M includes at least one of nickel, cobalt and iron, Cr is chromium, Al is aluminum, and Y is yttrium, and further comprising a ceramic thermal barrier coating disposed on the first side of the combustor wall. 
     
     
         12 . A combustor article, comprising:
 a combustor wall including first and second opposed sides, the second side including an array of geometric surface features for thermal transfer;   a ceramic thermal barrier coating disposed on the first side; and   a metallic coating disposed on at least a portion of the second side.   
     
     
         13 . The combustor article as recited in  claim 12 , wherein the metallic coating is continuous and fully covers one or more of the geometric surface features. 
     
     
         14 . The combustor article as recited in  claim 12 , wherein the metallic coating partially covers one or more of the geometric surface features. 
     
     
         15 . The combustor article as recited in  claim 12 , wherein the geometric surface features are surface protrusions. 
     
     
         16 . The combustor article as recited in  claim 12 , wherein the combustor wall includes an array of through-holes, the metallic coating at least partially covers one or more of the geometric surface features and has a first coating surface that is in contact with the second side of the combustor wall and a second coating surface that is a free surface, and the combustor wall is formed of a nickel-based alloy and the metallic coating is MCrAlY, where the M includes at least one of nickel, cobalt and iron, Cr is chromium, Al is aluminum, and Y is yttrium. 
     
     
         17 . A method for use with a combustor, the method comprising:
 a combustor that includes a combustion chamber and a combustor wall at least partially bounding the combustion chamber, the combustor wall including a first side facing the combustion chamber and a second side facing away from the combustion chamber, the second side including an array of geometric surface features for thermal transfer, and   resisting complete burn-through of the combustor wall using a metallic coating disposed on at least a portion of the second side of the combustor wall, the metallic coating being more resistant to oxidation than at least one material that forms the combustor wall.   
     
     
         18 . The method as recited in  claim 17 , wherein the combustor wall includes an array of through-holes, the metallic coating at least partially covers one or more of the geometric surface features and has a first coating surface that is in contact with the second side of the combustor wall and the second coating surface that is a free surface, the combustor wall is formed of a nickel-based alloy and the metallic coating is MCrAlY, where the M includes at least one of nickel, cobalt and iron, Cr is chromium, Al is aluminum, and Y is yttrium, and further comprising a ceramic thermal barrier coating disposed on the first side of the combustor wall.