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Preform and method of repairing nickel-base superalloys and components repaired thereby

  • US 7,335,427 B2
  • Filed: 12/17/2004
  • Issued: 02/26/2008
  • Est. Priority Date: 12/17/2004
  • Status: Expired due to Fees
First Claim
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1. A sintered preform consisting essentially of a sintered mixture of powders comprising a cobalt-base braze alloy and a cobalt-base wear-resistant alloy, the cobalt-base braze alloy constituting about 10 to about 35 weight percent or the sintered preform and containing a sufficient amount of boron so that the cobalt-base braze alloy has a melting temperature of about 1090°

  • C. to about 1230°

    C., wherein;

    the cobalt-base braze alloy consists of, by weight, about 22.00 to about 24.75% chromium, about 9.0 to about 11.0% nickel, about 6.5 to about 7.6% tungsten, about 3.0 to 4.0% tantalum, about 2.60 to 3.16% boron, about 0.55 to about 0.65% carbon, about 0.15 to 0.30% titanium, about 0.30 to 0.60% zirconium, up to 1.3% iron, up to 0.4% silicon, up to 0.10% manganese, up to 0.015% sulfur, and the balance cobalt and incidental impurities;

    the cobalt-base wear-resistant alloy consists of, by weight,about 26.0 to about 30.0% chromium, about 18.0 to about 21.0% tungsten, about 4.0 to about 6.0% nickel, about 0.75 to about 1.25% vanadium, about 0.7 to about 1.0% carbon, up to 3.0% iron, up to 1.0% manganese, up to 0.5% molybdenum, up to 1.0% silicon, up to 0.05% boron, and the balance cobalt and incidental impurities; and

    the sintered preform has a porosity of less than 2 volume percent as a result of being subjected to compression to promote fusion and reduce porosity during sintering.

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