Superalloy article repair method and alloy powder mixture
AssigneeGeneral Electric Company
InventorsMurray S. Smith, Jr., Mark S. Hilboldt, Thirmaleshwara A. Bhat
Life of this patent
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Abstract
A powder alloy mixture for use in a method of repairing high temperature superalloy articles includes a first, higher temperature alloy powder in the range of about 35-65 weight percent of the mixture. The first alloy powder is based on at least one element selected from Ni and Co and is characterized as having good strength and environmental resistance along with the substantial absence of melting point depressant elements selected from Si and B in amounts greater than about 1% Si and 0.5% B. The second alloy powder is of a lower melting temperature alloy of Ni--Cr--Si--B--Co and is characterized by the substantial absence of C.
Claims13
A mixture of a first alloy powder and a second alloy powder;
- the first alloy powder characterized as having good strength and environmental resistance and the substantial absence of melting point depressant elements selected from the group consisting of Si and B in amounts greater than, by weight, 1% Si and 0.05% B;
- the first alloy powder consisting essentially of, by weight, 0.01-0.65% C, 19-27% Cr, 0.2-16% W, up to 10% Mo, up to 20% Fe, up to 4% Ta, up to 1% Ti, up to 1% Zr, up to 0.5% La, up to 2% Mn, with the balance incidental impurities and at least one element selected from the group consisting of Ni and Co;
- the second alloy powder being of a Ni-Cr-Si-B-Co base alloy with a melting temperature lower than that of the first alloy powder and consisting essentially of, by weight, about 8-18% Cr, 2-6% Si, 1-5% B, 10-30% Co, up to about 5% Fe, with the balance Ni and incidental impurities, and further characterized by the substantial absence of C in amounts greater than an impurity level;
- the mixture consisting essentially of, by weight, 35-65% of the first alloy powder and 35-65% of the second alloy powder.
Dependencies are inferred from the claim text.