Superalloy article repair method and alloy powder mixture

Claim 1

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.