Metal treatment – Stock – Nickel base
Reexamination Certificate
2007-05-22
2007-05-22
Sheehan, John P. (Department: 1742)
Metal treatment
Stock
Nickel base
C420S448000, C420S449000
Reexamination Certificate
active
10065217
ABSTRACT:
A family of castable and weldable nickel-base alloys that exhibit a desirable balance of strength and resistance to corrosion and oxidation suitable for gas turbine engine applications. A first alloy consists essentially of, by weight, 1 8% to 20% cobalt, 22.2% to 22.8% chromium, 1.8% to 2.2% tungsten, greater than 1.5% to 2.3% aluminum, 1.6% to 2.4% titanium, where the sum of aluminum and titanium is 2.8% to 4.4%, 0.7% to 0.9% columbium, 0.9% to 1.9% tantalum, 0.003% to 0.009% boron, 0.002% to 0.02% zirconium, 0.05% to 0.10% carbon, with the balance essentially nickel and incidental impurities. A second alloy consists essentially of, by weight, 5% to 8% cobalt, 22.2% to 22.8% chromium, 1.8% to 2.2% tungsten, 1.2% to 2.3% aluminum, 1.6% to 2.4% titanium, where the sum of aluminum and titanium is 2.8% to 4.4%, 0.7% to 0.9% columbium, 0.9% to 1.9% tantalum, 0.003% to 0.009% boron, 0.002% to 0.02% zirconium, 0.05% to 0.10% carbon, with the balance essentially nickel and incidental impurities.
REFERENCES:
patent: 4039330 (1977-08-01), Shaw
patent: 4810467 (1989-03-01), Wood et al.
patent: 6106767 (2000-08-01), Kennedy et al.
patent: 6258317 (2001-07-01), Smith et al.
Beck Cyril Gerard
Graham Stephen Daniel
King Warren Tan
Wood John Herbert
Cusick Earnest
General Electric Company
Hartman Domenica N. S.
Hartman Gary M.
Sheehan John P.
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