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Novel flux-cored silver solder

A technology of silver solder and flux core, applied in welding/cutting medium/material, welding medium, metal processing equipment, etc., can solve problems such as poor spreading, fracture of flux-cored silver solder, broken wire, etc., and achieve excellent flow properties and moisture absorption resistance, improve market competitiveness, and improve the effect of moisture absorption resistance

Inactive Publication Date: 2020-03-31
ZHEJIANG YONGWANG WELDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation process of the flux-cored silver solder, the "fluidity" of the flux component of the flux core cannot match the plasticity of the silver solder. It is very easy to cause the fracture of the flux-cored silver solder (that is, the phenomenon of broken wire). Even if the fractured flux-cored silver solder is connected by "butt welding", since there is no flux at the joint, it will be damaged during the actual use of the product. The lack of local flux leads to the consequences of poor wetting and spreading of the molten solder; at the same time, in the production process, even if the butt-connected flux-cored silver solder is in the subsequent drawing and reducing process, it will be larger than the normal wire The material is easy to break, that is, it is easy to cause breakage again, which affects the stability of production efficiency and product quality
In addition, the common flux formulations given in JB / T 6045-2017 "Flux for Brazing" and JB / T 6045-1992 "Flux for Brazing" Table A1 have strong "moisture absorption" , unable to meet the needs of preparation and storage of cored silver solder

Method used

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  • Novel flux-cored silver solder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A novel flux-cored silver solder is prepared from the BAg18CuZnSn silver solder tape-coated flux powder given in claim 1. Among them, 17.0% Ag, 44.0% Cu, 2.0% Sn, and the balance is Zn.

[0027] The mass percent ratio of the coated flux powder is as follows: Potassium hydrogen fluoride (KHF 2 ) is 30%, potassium fluoride is 20%, boric acid is 33%, cesium carbonate is 0.1%, potassium carbonate is 2.0%, potassium silicate is 0.5%, sodium silicate is 0.5%, dipotassium hydrogen phosphate is 0.001% , the balance is potassium tetrafluoroborate (KBF 4 ). Wherein, the addition ratio of potassium silicate and sodium silicate is potassium silicate: sodium silicate = 1:1. The mass percentage of flux powder accounts for 18% of the whole flux-cored silver solder.

[0028] Using 4mm wide and 0.5mm thick BAg18CuZnSn silver solder strips, prepare flux cored silver solder wires with a wire diameter of 2.3mm on the flux cored wire preparation equipment, and then draw them sequentiall...

Embodiment 2

[0031] A novel flux-cored silver solder is prepared from the BAg18CuZnSn silver solder tape-coated flux powder given in claim 1. Among them, 19.0% Ag, 39.0% Cu, 2.5% Sn, and the balance is Zn.

[0032] The mass percent ratio of the coated flux powder is as follows: Potassium hydrogen fluoride (KHF 2 ) is 35%, potassium fluoride is 25%, boric acid is 30%, cesium carbonate is 0.5%, potassium carbonate is 3.0%, potassium silicate is 1.5%, sodium silicate is 1.5%, dipotassium hydrogen phosphate is 0.01% , the balance is potassium tetrafluoroborate (KBF 4 ). Wherein, the addition ratio of potassium silicate and sodium silicate is potassium silicate: sodium silicate = 1:1. The mass percentage of flux powder accounts for 28% of the whole flux-cored silver solder.

[0033] Using 8mm wide and 0.2mm thick BAg18CuZnSn silver solder strips, prepare flux cored silver solder wires with a wire diameter of 2.3mm on the flux cored wire preparation equipment, and then draw them sequentially...

Embodiment 3

[0036] A novel flux-cored silver solder is prepared from the BAg18CuZnSn silver solder tape-coated flux powder given in claim 1. Among them, 18.0% Ag, 41.0% Cu, 2.2% Sn, and the balance is Zn.

[0037] The mass percent ratio of the coated flux powder is as follows: Potassium hydrogen fluoride (KHF 2 ) is 32%, potassium fluoride is 22%, boric acid is 31%, cesium carbonate is 0.2%, potassium carbonate is 2.5%, potassium silicate is 1.0%, sodium silicate is 1.0%, dipotassium hydrogen phosphate is 0.005% , the balance is potassium tetrafluoroborate (KBF 4 ). Wherein, the addition ratio of potassium silicate and sodium silicate is potassium silicate: sodium silicate = 1:1. The mass percentage of flux powder accounts for 22% of the whole flux-cored silver solder.

[0038] Use 6mm wide and 0.4mm thick BAg18CuZnSn silver brazing material strips, prepare flux cored silver brazing material wires with a wire diameter of 2.3mm on the flux cored wire preparation equipment, and then dra...

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Abstract

The invention discloses a novel flux-cored silver solder, which belongs to a soldering material in the fields of metal materials and metallurgy. The novel flux-cored silver solder is prepared by coating soldering flux powder with a BAg18CuZnSn silver solder strip. And the BAg18CuZnSn silver solder strip is prepared from metal silver, copper, zinc and tin. The coating brazing flux powder is composed of potassium bifluoride (KHF2), potassium fluoride, boric acid, cesium carbonate, potassium carbonate, potassium silicate, sodium silicate, dipotassium hydrogen phosphate and potassium tetrafluoroborate (KBF4). Soldering flux powder in the flux-cored silver solder has excellent flowability and moisture absorption resistance, in the tape winding and drawing process of the flux-cored silver solder, the flux-cored silver solder does not have the phenomenon of wire breakage, the soldering flux powder cannot adhere to a roller, and the drawing diameter of the flux-cored silver solder can be reduced to 0.4 mm or below so as to meet the requirement for precise soldering.

Description

technical field [0001] The invention relates to a novel flux-cored silver solder for brazing, which belongs to brazing materials in the field of metal materials and metallurgy. Background technique [0002] Silver solder is widely used in brazing copper and copper alloys due to its suitable and easily adjustable melting temperature range according to different silver content, good electrical and thermal conductivity, excellent wetting, spreading performance and brazing process performance. , carbon steel, alloy steel and stainless steel, nickel-based alloys. In the traditional brazing process of silver solder (except for special brazing methods such as vacuum brazing and reducing atmosphere), it is necessary to match the flux containing fluoride to remove the oxides on the surface of the solder and the workpiece, so as to improve the silver solder on the workpiece. The wetting and spreading properties of the surface can finally obtain a brazed joint with excellent performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/368B23K35/30B23K35/40
CPCB23K35/3006B23K35/368B23K35/40
Inventor 盛永旺徐小寅倪国成吴文彬汪博蒋飞禄傅惠琴
Owner ZHEJIANG YONGWANG WELDING MATERIALS CO LTD
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