NICKEL DIFFUSION BRAZE ALLOY AND METHOD FOR REPAIR OF SUPERALLOYS

摘要

One brazing alloy mixture of powders comprising a low thawing powder composition and a high thawing powder composition. Low thawing powder composition is made of one or more low spot-thawings powders and including 50-70% Ni, 8-20% Cr, 8-15% tantalums, 4-10% Co, 2-7% Al, and up to 2.25% B. High thawing powder composition is made of one or more high point-thawings powders and including 50-70% Ni, 2-10% Cr, 2-10% tantalums, 5-15% Co, 2-10% Al, 2-10% W, up to about 3% each Re, Mo and Hf. Up to about 1% titanium, W, Mo, Re, Nb, Hf, Pd, Pt, Ir, Ru, C, Si and/or Zr may be embodied in low thawing powder, and high thawing powder may include up to about 1% each titanium, Nb, C, B, Si and Zr.