Brazing Composition and Brazing Method for Superalloys

Abstract

A brazing composition for the brazing of superalloys including a base material with at least one initial phase is provided. The initial phase has a solidus temperature that is below the solidus temperature of the base material and, above a certain temperature, forms with the base material and/or with at least one further initial phase at least one resultant phase, the solidus temperature of which is higher that the solidus temperature of the initial phases. Heat treatment takes place in two stages, wherein the temperature of the second heat treatment is preferably 800-1200° C. The brazing composition may likewise be of the type MCrAlX, and the power particles of the initial phase may be in the form of nanoparticles.

1 . A brazing composition, comprising:
 a base material with a first solidus temperature; and   an initial phase with a second solidus temperature,   wherein the second solidus temperature is below the first solidus temperature,   wherein the initial phase is selected so that a resultant phase is formed,   wherein during a heat treatment above a specific temperature and when the initial phase is together with the base material and/or the initial phase is together with a further initial phase, a third solidus temperature of the resultant phase is higher than the second solidus temperature or a fourth solidus phase of the further initial phase, and   wherein the base material comprises nickel and the initial phase is aluminum.   
     
     
         2 . The brazing composition as claimed in  claim 1 , wherein the aluminum content is not more than 25% by weight. 
     
     
         3 . The brazing composition as claimed in  claim 1 , wherein the aluminum content is not more than 10% by weight. 
     
     
         4 . The brazing composition as claimed in  claim 1 , wherein the base material is nickel. 
     
     
         5 . The brazing composition as claimed in  claim 1 ,
 wherein the brazing composition is a MCrAlX material,   wherein M is the base material which comprises nickel,   wherein M further comprises Co and/or Fe, and   wherein X stands for yttrium and/or silicon and/or a rare earth element.   
     
     
         6 . The brazing composition as claimed in  claim 1 ,
 wherein the brazing composition is present in a form of a powder mixture, and   wherein the initial phase has a first plurality of powder particles which are smaller than a second plurality of powder particles of the base material.