초록 ▼

A cobalt base, high temperature brazing alloy having a composition, by weight of: [TABLE] ______________________________________ Nickel from about 8.5% to about 12.5% Chromium from about 24% to about 40% Tungsten from about 0% to about 9% Carbon from about 0.03% to about 0.6

A cobalt base, high temperature brazing alloy having a composition, by weight of: [TABLE] ______________________________________ Nickel from about 8.5% to about 12.5% Chromium from about 24% to about 40% Tungsten from about 0% to about 9% Carbon from about 0.03% to about 0.6% Boron from about 0.01% to about 3.5% Silicon from about 1.0% to about 11% Manganese up to about 2% Cobalt Balance ______________________________________ is provided for use in the repair of Co-base turbine component superalloys.

대표청구항 ▼

1. A method of repairing a region of a hot corrosion resistant Co-base superalloy substrate comprising the steps of: (a) preparing a mixture of a brazing alloy composition in a powder form consisting essentially of, by weight: [TABLE] ______________________________________ Nickel from a

1. A method of repairing a region of a hot corrosion resistant Co-base superalloy substrate comprising the steps of: (a) preparing a mixture of a brazing alloy composition in a powder form consisting essentially of, by weight: [TABLE] ______________________________________ Nickel from about 8.5% to about 12.5% Chromium from about 24% to about 40% Tungsten from about 0% to about 9% Carbon from about 0.03% to about 0.6% Boron from about 0.01% to about 3.5% Silicon from about 1.0% to about 11% Manganese up to about 2% Cobalt Balance ______________________________________ and a powder of said hot corrosion resistant Co-base superalloy; and (b) vacuum depositing said mixture on said region of said Co-base superalloy substrate to be repaired, thereby causing said brazing alloy powder to melt and alloy with said Co-base superalloy powder and said Co-base superalloy substrate, wherein said chromium in the amount of from about 24 to about 40% by weight of the brazing alloy composition imparts hot corrosion resistance to said mixture to thereby enable the region to be repaired to have properties approximating those of the Co-base superalloy. 2. The method according to claim 1 and further including the step of: (c) heat treating the repaired region to promote interdiffusion and migration of Boron away from said region. 3. The method according to claim 1 wherein said brazing alloy composition consists essentially of, by weight: [TABLE] ______________________________________ Ni 10%; Cr 29%; W 7%; C 0.1%; B 2.5%; Si 2.5%; Mn 0.6%; Co balance ______________________________________ 4. The method according to claim 1 wherein said brazing alloy composition consists essentially of, by weight: [TABLE] ______________________________________ Ni 10%; Cr 29%; W 3.5%; C 0.1%; B 1%; Si 7%; Mn 0.6% Co balance ______________________________________ 5. The method according to claim 1 wherein said Co-base superalloy substrate has a composition consisting essentially of, by weight: [TABLE] ______________________________________ Ni 10%; Cr 29%; W 7.5%; C 0.25%; B 0.015%; Si 0.9%; Mn 0.6% Co balance ______________________________________ 6. The method according to claim 5 wherein said brazing alloy compositions consists essentially of by weight: [TABLE] ______________________________________ Ni 10%; Cr 29%; W 7%; C 0.1%; B 2.5%; Si 2.5%; Mn 0.6% Co balance ______________________________________ 7. The method according to claim 5 wherein said brazing alloy composition consists essentially of by weight: [TABLE] ______________________________________ Ni 10%; Cr 29%; W 3.5%; C 0.1%; B 1%; Si 7%; Mn 0.6% Co balance ______________________________________