Homogenous alloy powder

Claim 1

A mixture of a Ni base superalloy first powder and a Ni base superalloy second powder, the combination defining a homogenous powder system; the first powder characterized by superior hot corrosion resistance along with good oxidation resistance and mechanical properties, and the substantial absence of melting point depressant elements selected from the group consisting of Si and B in amounts greater than 1 wt % Si and 0.05 wt % B; the first powder consisting essentially of, by weight, 0.01-0.2% C, 16-23% Cr, 2-10% Mo, 15-21% Fe, up to 6% of the sum of Cb and Ta, up to 2% Ti, less than 2% Al, less than 3% Co, up to 2% W, with the balance Ni and incidental impurities; and the second powder having a composition which includes all of the elements of the first powder each, except for elements selected from the group consisting of Si and B, within the respective percentage range of that of the first powder, the second powder consisting essentially of, by weight, 0.01-0.2% C, 16-23% Cr, 2-10% Mo, 15-21% Fe, up to 6% of the sum of Cb and Ta, up to 2% Ti, less than 2% Al, less than 3% Co, up to 2% W, 0.5-5% B, up to 6% Si, with the balance Ni and incidental impurities, and having a melting temperature lower than that of the first powder; the mixture consisting essentially of, by weight, 30-70% of the firt powder and 30-70% of the second powder.