Homogeneous, ductile cobalt based brazing foils

Details Homogeneous, ductile cobalt based brazing foils Homogeneous, ductile cobalt based brazing foils

B - Operations, Transporting

23

K

13/6, 75/1.1

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

Patent

CA 1160867

ABSTRACT HOMOGENEOUS, DUCTILE COBALT BASED BRAZING FOILS AND ARTICLE BRAZED WITH SAID FOILS Brazing of metal parts employing a homogeneous, ductile, filler metal foil is disclosed. The brazing foil, useful for brazing cobalt based alloys, has a composition consisting essentially of 0 to about 4 atom percent iron, 0 to about 26 atom percent chromium, 0 to about 20 atom percent nickel, 0 to about 4 atom percent tungsten, 0 to about 4 atom percent molybdenum, 0 to about 20 atom percent boron, 0 to about 12 atom percent silicon, 0 to about 2 atom percent carbon and the balance essentially cobalt and incidental impurities. In addition to containing the foregoing elements within the above noted composition ranges, the composition must be such that the total of iron, chromium, nickel, tungsten, molybdenum and cobalt ranges from about 75 to 85 atom percent and the total of boron, silicon and carbon ranges from about 15 to 25 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 cobalt and nickel based alloys.

352728

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