Nickel diffusion braze alloy and method for repair of superalloys
AssigneeROLLS-ROYCE plc
InventorsRichard Patrick Chesnes, Raymond Ruiwen Xu
Life of this patent
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Abstract
A braze alloy powder mixture that includes a low-melt powder composition and a high-melt powder composition. The low-melt powder composition is made of one or more low-melt powders and includes 50-70% Ni, 8-20% Cr, 8-15% Ta, 4-10% Co, 2-7% Al, and up to 2.25% B. The high-melt powder composition is made of one or more high-melt powders and includes 50-70% Ni, 2-10% Cr, 2-10% Ta, 5-15% Co, 2-10% Al, 2-10% W, and up to about 3% each of Re, Mo and Hf. Up to about 1% Ti, W, Mo, Re, Nb, Hf, Pd, Pt, Ir, Ru, C, Si, and/or Zr may be included in the low-melt powder, while the high-melt powder may include up to about 1% each of Ti, Nb, C, B, Si, and Zr.
Claims17
A braze alloy powder composition comprising:
- (a) at least one low-melt alloy powder, and (b) at least one high-melt alloy powder;
- wherein said at least one low-melt alloy powder comprises 50-70% Ni, 8-20% Cr, 8-15% Ta, 4-10% Co, 2-7% Al, and up to 2.25% B, and wherein said at least one high-melt alloy powder comprises 50-70% Ni, 2-10% Cr, 2-10% Ta, 5-15% Co, 2-10% Al, 2-10% W, 2-4% Re, and up to 3% each of Mo and Hf.
A braze alloy mixture consisting essentially of 50-70% Ni, 10-15% Cr, 8-10% Ta, 8-10% Co, 4-6% Al, 2-4% W, and about 1% each of Mo, Re, and Hf.
A braze alloy mixture consisting essentially of about 58% Ni, about 11% Cr, about 9% Ta, about 9% Co, about 5% Al, about 3% W, and about 1% each of Mo, Re, and Hf.
A method of repairing an article made of a nickel-based superalloy material, said method comprising:
- (a) providing a braze alloy powder composition comprising:
- (i) at least one low-melt alloy powder, and
- (ii) at least one high-melt alloy powder;
- wherein said at least one low-melt alloy powder comprises 50-70% Ni, 8-20% Cr, 8-15% Ta, 4-10% Co, 2-7% Al, and up to 2.25% B;
- and
- wherein said at least one high-melt alloy powder comprises 50-70% Ni, 2-10% Cr, 2-10% Ta, 5-15% Co, 2-10% Al, 2-10% W, and up to 3% each of Mo, Re, and Hf;
- (b) brazing a damaged portion of the article with said braze alloy powder composition, wherein said brazing is done at temperatures of between about 2150° F. and about 2350° F.
Dependencies are inferred from the claim text.