Ductile brazing foil for cast superalloys

Details Ductile brazing foil for cast superalloys Ductile brazing foil for cast superalloys

1978-07-19

1979-07-10

Rutledge, L. Dewayne

Stock material or miscellaneous articles

All metal or with adjacent metals

Foil or filament smaller than 6 mils

148 315, 428366, 428627, 428378, F16B 508

Patent

active

041608542

ABSTRACT:
Cast superalloys of the formula P.sub.x Q.sub.y R.sub.z wherein P is an element selected from the group consisting of Fe, Ni, Cr, Co or mixtures thereof, wherein Q is a refractory element selected from the group consisting of Mo, W, Ta or a mixture thereof wherein R is a reactive element selected from the group consisting of Al, Ti, Cb or mixtures thereof, x is from about 65 to about 95 atomic percent, y is from about 1 to about 10 atomic percent, z is from about 1 to about 18 atomic percent and x+y+z is equal to about 100 in the form of thin foil are made ductile by the presence of appreciable amounts of amorphous phase and micro-crystalline, metastable single phase and subsequently boron is deposited as nickel, iron or cobalt boride on the surface of the foil at a temperature below the crystallization temperature of the superalloy. Such foil is especially suited for preplacement in a joining operation such as brazing.

REFERENCES:
patent: 3753794 (1973-08-01), Paulon et al.
patent: 4052201 (1977-10-01), Polk et al.
patent: 4056411 (1977-11-01), Chen et al.
patent: 4059441 (1977-11-01), Roy et al.
patent: 4067732 (1978-01-01), Roy
patent: 4116682 (1978-09-01), Polk et al.

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