# US 12,109,652 B2 · Copper-tin brazing wire and preparation method and use thereof

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- Number: US 12,109,652 B2
- Document ID: US12109652B2
- Status: Granted
- Kind: B2
- Application number: 18/169,207
- Filed: 2023-02-14
- Published: 2023-11-23
- Granted: 2024-10-08
- Earliest claimed: 2022-05-20
- Assignees: Zhengzhou Research Institute of Mechanical Engineering Co., Ltd.
- Applicants: Zhengzhou Research Institute of Mechanical Engineering Co., Ltd.
- Inventors: Weimin Long; Sujuan Zhong; Yinyin Pei; Junlan Huang; Quanbin Lu; Yongtao Jiu; Xusheng Zhou; Mengjie Nie
- Web page: https://patentgrep.com/patent/US12109652B2

## CPC

- B23K 35/0227: {Rods or wires (B23K35/0244 takes precedence)}
- B23K 35/302: {Cu as the principal constituent}
- B23K 35/40: Making wire or rods for soldering or welding
- B23K 35/404: {Coated rods; Coated electrodes}
- C22C 9/00: Alloys based on copper
- C22C 9/02: with tin as the next major constituent
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

A copper-tin brazing wire and a preparation method and use thereof are provided. A copper-tin brazing wire includes a plurality of copper wires each having a composite metal layer on a surface thereof; the copper-tin brazing wire includes, in parts by weight, 75-84 parts of Cu, 20-25 parts of Sn, and 0.4-0.5 parts of P; and the composite metal layer includes Cu, Sn, and P, in which a mass ratio of Cu, Sn, and P is (45-55):(46-56):(0.5-1.5).

## Claims

### Claim 1

A copper-tin brazing wire comprising a plurality of copper wires each having a composite metal layer on a surface thereof;
the copper-tin brazing wire comprising, in parts by weight, 75-84 parts of Cu, 20-25 parts of Sn, and 0.4-0.5 parts of P; and
the composite metal layer comprising Cu, Sn, and P, wherein a mass ratio of Cu, Sn, and P is (45-55):(46-56):(0.5-1.5).

### Claim 2 (depends on 1)

The copper-tin brazing wire according to claim 1, wherein the copper-tin brazing wire comprises, in parts by weight, 78-82 parts of Cu, 21-24 parts of Sn, and 0.42-0.48 parts of P.

### Claim 3 (depends on 1)

The copper-tin brazing wire according to claim 1, wherein the mass ratio of Cu, Sn, and P in the composite metal layer is (48-52):(49-55):(0.8-1.2).

### Claim 4 (depends on 1)

The copper-tin brazing wire according to claim 1, wherein the copper-tin brazing wire comprises 5 to 25 copper wires each having the composite metal layer on the surface thereof.

### Claim 5 (depends on 1)

A preparation method of the copper-tin brazing wire according to claim 1, comprising steps of:
coating a mixed molten liquid of Cu, Sn, and P on surfaces of the copper wires, and twisting a plurality of the coated copper wires into one strand to obtain the copper-tin brazing wire;
wherein the mass ratio of Cu, Sn and P in the mixed molten liquid is (45-55):(46-56):(0.5-1.5).

### Claim 6 (depends on 5)

The preparation method of the copper-tin brazing wire according to claim 5, wherein the copper wires each have a diameter of 0.018-0.022 mm.

### Claim 7 (depends on 5)

The preparation method of the copper-tin brazing wire according to claim 5, wherein the copper-tin brazing wire comprises, in parts by weight, 78-82 parts of Cu, 21-24 parts of Sn, and 0.42-0.48 parts of P.

### Claim 8 (depends on 5)

The preparation method of the copper-tin brazing wire according to claim 5, wherein the mixed molten liquid is formed by melting and mixing Cu, Sn, and Cu14P alloy.

### Claim 9 (depends on 5)

The preparation method of the copper-tin brazing wire according to claim 5, wherein winding is performed after the twisting.

### Claim 10 (depends on 1)

A brazing method, using the copper-tin brazing wire according to claim 1.

### Claim 11 (depends on 4)

The copper-tin brazing wire according to claim 4, wherein the copper wires each have a diameter of 0.018-0.022 mm.

### Claim 12 (depends on 4)

The copper-tin brazing wire according to claim 4, wherein the copper-tin brazing wire is formed by intertwining the plurality of copper wires each having the composite metal layer on the surface thereof.

### Claim 13 (depends on 2)

The copper-tin brazing wire according to claim 2, wherein the copper-tin brazing wire comprises 5 to 25 copper wires each having the composite metal layer on the surface thereof.

### Claim 14 (depends on 3)

The copper-tin brazing wire according to claim 3, wherein the copper-tin brazing wire comprises 5 to 25 copper wires each having the composite metal layer on the surface thereof.

### Claim 15 (depends on 8)

The preparation method of the copper-tin brazing wire according to claim 8, wherein a melting temperature is 800-950° C.

### Claim 16 (depends on 9)

The preparation method of the copper-tin brazing wire according to claim 9, wherein 5-25 coated copper wires are twisted into one strand to obtain the copper-tin brazing wire which is then wound.

### Claim 17 (depends on 9)

The preparation method of the copper-tin brazing wire according to claim 9, wherein a winding speed is 8-15 mm/s.