# US 11,898,253 B2 · Process for producing tinned copper wires

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- Number: US 11,898,253 B2
- Document ID: US11898253B2
- Status: Granted
- Kind: B2
- Application number: 17/301,240
- Filed: 2021-03-30
- Published: 2021-10-07
- Granted: 2024-02-13
- Earliest claimed: 2020-04-02
- Assignees: Jiangxi Advanced Copper Industry Research Institute
- Applicants: Jiangxi Advanced Copper Industry Research Inst
- Inventors: Mingmao Li; Shijun Tang; Shihong Tang; Mingbiao Zhu; Wenjing Wang
- Web page: https://patentgrep.com/patent/US11898253B2

## CPC

- C23C 4/08: containing only metal elements (C23C4/073 takes precedence)
- B23K 35/0227: {Rods or wires (B23K35/0244 takes precedence)}
- B23K 35/302: {Cu as the principal constituent}
- B23K 35/362: Selection of compositions of fluxes (B23K35/365, B23K35/368 take precedence)
- C23C 2/02: Pretreatment of the material to be coated, e.g. for coating on selected surface areas (C23C2/30 takes precedence)
- C23C 2/08: Tin or alloys based thereon
- C23C 2/29: {Cooling or quenching}
- C23C 2/38: Wires; Tubes
- C23C 4/123: Spraying molten metal
- C23C 4/16: Wires; Tubes
- C23C 4/18: After-treatment
- B23K 2101/32: Wires
- B23K 2101/34: Coated articles {; Surface treated articles}
- B23K 2103/12: Copper or alloys thereof
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- 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

## Abstract

Provided is a process for producing a tinned copper wire. The process comprises subjecting a copper wire sequentially to activation treatment, a first hot tinning treatment, a first cooling, a second hot tinning treatment, and a second cooling to obtain a tinned copper wire. The first hot tinning treatment is carried out at a first temperature and the second hot tinning treatment is carried out at a second temperature. The first temperature is higher than the second temperature. The first temperature is at least 38° C. higher than the melting point of tin. The second temperature is at least 8° C. higher than the melting point of tin.

## Claims

### Claim 1

A process for producing a tinned copper wire, comprising:
subjecting a copper wire sequentially to activation treatment, a first hot tinning treatment, a first cooling, a second hot tinning treatment, and a second cooling to obtain a tinned copper wire,
wherein:
the first hot tinning treatment is carried out in a first molten tin liquid at a first temperature;
the second hot tinning treatment is carried out in a second molten tin liquid at a second temperature;
the first temperature is higher than the second temperature;
the first temperature is at least 38° C. higher than the melting point of tin; and
the second temperature is at least 8° C. higher than the melting point of tin;
wherein the first temperature is 320° C., and wherein the second temperature is 245° C.;
the second molten tin liquid for the second hot tinning treatment comprises a rare metal in an amount of 0.08 wt %, and the rare metal is composed of indium, bismuth and nickel at a mass ratio of 1:1:1;
the first hot tinning treatment is carried out with the first molten tin liquid comprising copper contamination from the copper wire in an amount of zero wt % to 2.0 wt %, and wherein the second hot tinning treatment is carried out with the second molten tin liquid comprising copper contamination from the copper wire in an amount of zero wt % to 0.7 wt %
the first molten tin liquid for the first hot tinning treatment comprises phosphorus in an amount of 0.1 wt %.

### Claim 2 (depends on 1)

The process of claim 1 wherein the second cooling is carried out by a wind cooling method, at a wind speed of 10-15 meters per second with a wind direction that is perpendicular to the copper wire.

### Claim 3 (depends on 1)

The process of claim 1 wherein the copper wire is conveyed at a speed of 150-400 meters per minute during the process.

### Claim 4 (depends on 3)

The process of claim 3 wherein the copper wire is conveyed at a speed of 150-200 meters per minute when the copper wire has a diameter of greater than 0.8 millimeters (mm), or 300-400 meters per minute when the copper wire has a diameter of less than 0.1 mm, or 200-300 meters per minute when the copper wire has a diameter of 0.1-0.8 mm.

### Claim 5 (depends on 1)

The process of claim 1 wherein a cooling length of the copper wire in the first cooling is 1.0-1.5 meters.

### Claim 6 (depends on 1)

The process of claim 1 wherein the first hot tinning treatment is performed in a first hot tinning furnace containing the first molten tin liquid, wherein the second hot tinning treatment is performed in a second hot tinning furnace containing the second molten tin liquid, and wherein the process further comprises transferring the second molten tin liquid from the second hot tinning furnace to the first hot tinning furnace when concentration of copper contamination from the copper wire in the second molten tin liquid reaches a predetermined threshold.