Copper-based brazing alloy and brazing process
AssigneeVacuumschmelze GmbH & Co. KG
InventorsThomas Hartmann, Dieter Nuetzel
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Abstract
The invention proposes a brazing alloy, which can be produced in particular as a homogenous, ductile, amorphous brazing foil and consists of 2 to 20 atom % of nickel, 2 to 12 atom % of tin, 0.5 to 5.0 atom % of zinc, 6 to 16 atom % of phosphorus, remainder copper and incidental impurities. The total amount of copper, nickel, tin and zinc is between 80 and 95 atom %. The addition of more than 0.5 atom % of zinc produces excellent resistance to surface oxidation in air and/or atmospheric humidity. These brazing alloys can be used to produce excellent brazed joints.
Claims16
A brazing alloy with a composition consisting of
- NiaSnbZncPdCuRemainder
- where 2≦a≦20 atom %;
- 2≦b≦12 atom %;
- c>0.5 atom %;
- 6≦d≦16 atom %;
- remainder copper and incidental impurities, with the total amount of copper, nickel, tin and zinc being between 80 and 95 atom %.
A homogenous, ductile brazing foil with a composition consisting of
- NiaSnbZncPdCuRemainder
- where 2≦a≦20 atom %;
- 2≦b≦12 atom %;
- 0.5<c≦5.0 atom %;
- 6 d≦16 atom %;
- remainder copper and incidental impurities, with the total amount of copper, nickel, tin and zinc being between 80 and 95 atom %.
A brazing powder with a composition consisting of
- NiaSnbZncPdCuRemainder
- where 2≦a≦20 atom %;
- 2≦b≦12 atom %;
- 0.5<c≦5.0 atom %;
- 6 d≦16 atom %;
- remainder copper and incidental impurities, with the total amount of copper, nickel, tin and zinc being between 80 and 95 atom %.
Dependencies are inferred from the claim text.