Braze alloy compositions and brazing methods for superalloys

Abstract

A multi-component braze filler alloy comprising 60-70% by weight CM247 superalloy and BRB braze alloy is diffusion brazed to a CM247 alloy base substrate, such as a gas turbine blade or vane. The substrate/braze interface may be subsequently weld-repaired without de-melting and migrating the braze alloy from the interface. The weld zone and surrounding area are solidification crack resistant. After the alloy composition is brazed to the base substrate the component may be returned to service. Thereafter the component remains repairable by welding or re-brazing, if needed to correct future in-service defects.

What is claimed is: 
     
         1 . A material for the braze repair of a nickel-base superalloy turbine component comprising a CM247/BRB mixture of CM247 base alloy in the range from approximately 60% to 70% by weight and the balance comprises BRB braze alloy. 
     
     
         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 Ni-base superalloy component is a turbine vane or blade. 
     
     
         4 . A material as in  claim 1 , wherein the CM247/BRB mixture comprises about 80% of CM247 base alloy by weight and the balance comprises the BRB braze alloy wherein the components brazed with the material are not subjected to temperatures exceeding about 2270 deg. F. during the brazing process. 
     
     
         5 . A material as in  claim 4 , wherein the nickel-base superalloy turbine component comprises CM247. 
     
     
         6 . A material as in  claim 4 , wherein the Ni-base superalloy component is a turbine vane or blade. 
     
     
         7 . 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, wherein the brazing material comprises a mixture of CM247 base alloy in the range from about 60% to about 70% by weight and the balance comprising a BRB braze alloy. 
     
     
         8 . An article of manufacture as in  claim 7 , wherein the nickel-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 7 , wherein the Ni-base superalloy component has a portion thereof re-repaired by post braze welding and is suitable for continued service. 
     
     
         11 . An article of manufacture as in  claim 7 , wherein the Ni-base superalloy component is post-braze heat treated and is suitable for continued service.