Braze alloy compositions and brazing methods for superalloys

Abstract

A multi-component braze filler alloy comprising at least 70% by weight MarM509A superalloy with the remainder MarM509B superalloy is diffusion brazed to a CM247 alloy base substrate, such as a gas turbine blade or vane. It is shown that generally higher braze temperatures lead to improved results including the possibility of re-welding such a brazed component, resulting in a re-repaired brazed component capable of continued commercial service.

We claim: 
     
         1 . A material for the braze repair of a nickel-base superalloy turbine component comprising:
 a MarM509A/B mixture of no less than approximately 70% by weight of MarM509A base alloy and the balance comprising MarM509B braze alloy, including about 10%-15% by volume of a liquid binder to form a paste.   
     
     
         2 . A material as in  claim 1  wherein the nickel-base superalloy turbine component comprises CM247. 
     
     
         3 . A material as in  claim 1 , wherein the nickel-base superalloy component is a turbine vane or blade. 
     
     
         4 . An article of manufacture comprising a Ni-base superalloy component wherein the Ni-base superalloy component has a portion thereof repaired by brazing with a brazing material according to  claim 1 . 
     
     
         5 . An article of manufacture as in  claim 4 , wherein the Ni-base superalloy turbine component comprises CM247. 
     
     
         6 . An article of manufacture as in  claim 4 , wherein the Ni-base superalloy component is a turbine vane or blade. 
     
     
         7 . An article of manufacture as in  claim 4 , wherein the Ni-base superalloy component has a portion thereof re-repaired by post braze welding and is suitable for continued service. 
     
     
         8 . An article of manufacture as in  claim 7 , wherein the Ni-base superalloy turbine component comprises CM247. 
     
     
         9 . An article of manufacture as in  claim 7 , wherein the Ni-base superalloy component is a turbine vane or blade. 
     
     
         10 . An article of manufacture as in  claim 4 , wherein the Ni-base superalloy component is post-braze heat treated and is suitable for continued service. 
     
     
         11 . An article of manufacture as in  claim 10 , wherein the Ni-base superalloy turbine component comprises CM247 or is a turbine blade or is a turbine vane.