Homogeneous, ductile brazing foils

Details Homogeneous, ductile brazing foils Homogeneous, ductile brazing foils

C - Chemistry, Metallurgy

22

C

75/1.1

C22C 30/00 (2006.01) B23K 35/02 (2006.01) B23K 35/30 (2006.01)

Patent

CA 1186531

ABSTRACT HOMOGENEOUS, DUCTILE BRAZING FOILS Brazing of metal parts employing a thin, homo- geneous, ductile, filler metal foil is disclosed. The brazing foil, useful for brazing stainless steels, is less than about 0.064 mm (.0025 inch) thick and has a composition consisting essentially of 0 to about 6 atom percent iron, 0 to about 21 atom percent chromium, 0 to about 4 atom percent molybdenum, 0 to about 5 atom percent tungsten, 0 to about 20 atom percent cobalt, 0 to about 19 atom percent boron, 0 to about 12 atom per- cent silicon, 0 to about 22 atom percent phosphorus, 0 to about 3 atom percent carbon and the balance nickel and incidental impurities. In addition to containing the foregoing elements within the above-noted composi- tion ranges, the composition must be such that the total of iron, chromium, molybdenum, tungsten, cobalt and nickel ranges from about 76 to 84 atom percent and the total of boron, silicon, phosphorus and carbon ranges from about 16 to 24 atom percent. The ductile foil permits fabrication of preforms of complex shapes which do not require binders and/or fluxes necessary for brazing powders presently used to braze stainless steels and nickel base alloys.

389115

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