Stock material or miscellaneous articles – All metal or with adjacent metals – Having metal particles
Patent
1993-09-20
1995-05-23
Walsh, Donald P.
Stock material or miscellaneous articles
All metal or with adjacent metals
Having metal particles
428545, 428548, 428551, 428552, 428553, 428554, 428557, 428564, B22F 704
Patent
active
054180724
ABSTRACT:
A consumable brazing encapsulate is used for joining aluminum to metal surfaces, e.g. aluminum, copper, brass or steel surfaces, by brazing. The encapsulate comprises a mixture of particles of an eutectic forming metal selected from the group consisting of silicon, germanium, copper and zinc and particles of a brazing flux encapsulated in a layer or layers of aluminum or its alloys, said eutectic forming metal and flux being present in the following parts by weight per 100 parts by weight of the total aluminum in the encapsulate: (a) 7 to 15 parts of silicon and 7 to 45 parts of flux; (b) 25 to 120 parts of germanium and 100 to 250 parts of flux; (c) 40 to 70 parts of copper and 20 to 100 parts of flux; (d) 1300 to 2400 parts of zinc and 1000 to 2000 parts of flux; such that when the encapsulate is placed between aluminum surfaces to be joined and is heated, the eutectic forming metal and the encapsulating aluminum are totally converted in situ into an eutectic filler metal for joining the aluminum surfaces. It may also be in the form of a consumable brazing laminate in which the mixture of particles are bonded to an aluminum substrate by means of a binding agent.
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Baldantoni Antonio
Timsit Roland S.
Alcan International Limited
Greaves John N.
Walsh Donald P.
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