# US 7,461,770 B2 · Copper-based brazing alloy and brazing process

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- Number: US 7,461,770 B2
- Document ID: US7461770B2
- Status: Granted
- Kind: B2
- Application number: 11/095,731
- Filed: 2005-04-01
- Published: 2005-10-20
- Granted: 2008-12-09
- Earliest claimed: 2003-08-04
- Assignees: Vacuumschmelze GmbH & Co. KG
- Inventors: Thomas Hartmann; Dieter Nuetzel
- Web page: https://patentgrep.com/patent/US7461770B2

## CPC

- C22C 9/02: with tin as the next major constituent
- C22C 9/06: with nickel or cobalt as the next major constituent
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## 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.

## Claims

### Claim 1

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 %.

### Claim 2 (depends on 1)

The brazing alloy as claimed in claim 1, with a composition consisting of
NiaSnbZncPdCuRemainder
where 3≦a≦10 atom %; 2≦b≦8 atom %; c>0.8 atom %; 8≦d≦15 atom %; remainder copper and incidental impurities.

### Claim 3

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 %.

### Claim 4 (depends on 3)

The homogenous, ductile brazing foil as claimed in claim 3, with a composition consisting of
NiaSnbZncPdCuRemainder
where 3≦a≦10 atom %; 2≦b≦8 atom %; 0.8≦c≦3.0 atom %; 8≦d≦15 atom %; remainder copper and incidental impurities, with the total amount of copper, nickel, tin and zinc being between 80 and 95 atom %.

### Claim 5 (depends on 3)

The brazing foil as claimed in claim 3, characterized by an increase in mass per unit foil area of less than 0.003 mg/cm2 after annealing in air at an annealing temperature T=175° C. and for an annealing time of 60 min.

### Claim 6 (depends on 5)

The brazing foil as claimed in claim 5, characterized by an increase in mass per unit foil area of less than 0.002 mg/cm2 after annealing in air at an annealing temperature T=175° C. and for an annealing time of 60 min.

### Claim 7 (depends on 3)

The brazing foil as claimed in claim 3, characterized in that the brazing foil is at least 80% amorphous.

### Claim 8 (depends on 3)

The brazing foil as claimed in claim 3, characterized by a thickness 25 μm≦D≦100 μm.

### Claim 9 (depends on 3)

The brazing foil as claimed in claim 3, characterized by a width 40 mm≦B≦300 mm.

### Claim 10 (depends on 7)

The brazing foil as claimed in claim 7, characterized by a width B≦60 mm.

### Claim 11

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 %.

### Claim 12 (depends on 11)

The brazing powder as claimed in claim 11, with a composition consisting of
NiaSnbZncPdCuRemainder
where 3≦a≦10 atom %; 2≦b≦8 atom %; 0.8≦c≦3.0 atom %; 8≦d≦15 atom %; remainder copper and incidental impurities, with the total amount of copper, nickel, tin and zinc being between 80 and 95 atom %.

### Claim 13 (depends on 11)

The brazing powder as claimed in claim 11, wherein the brazing powder has a diameter of between 38 μm and 45 μm.

### Claim 14 (depends on 12)

The brazing powder as claimed in claim 12, wherein the brazing powder has a diameter of between 38 μm and 45 μm.

### Claim 15 (depends on 11)

The brazing powder as claimed in claim 11, wherein the brazing powder comprises a solder paste.

### Claim 16 (depends on 11)

The brazing powder as claimed in claim 11, wherein the powder has an increase in mass of less than 0.50 mg/g after annealing in air at an annealing temperature T=175° C. and for an annealing time of 60 min.