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Cadmium-free silver filler containing lithium and niobium and production method thereof

A silver brazing filler metal technology, applied in welding/cutting media/materials, welding media, metal processing equipment, etc., can solve problems such as increased material cost, and achieve improved purity, good processing performance, and excellent spreadability. Effect

Active Publication Date: 2009-09-09
JINHUA SANHUAN WELDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although some new products of cadmium-free silver solder have been developed at home and abroad, because the silver content of these products is high, generally more than 25% (mass percentage), the material cost is greatly increased.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] According to the mass percentage ratio, its composition is: 35.0% Cu, 42.0% Zn, 6.0% Sn, 0.001% Li, 0.01% Nb, and the rest is Ag.

[0016] The solidus temperature of the "cadmium-free silver solder containing lithium and niobium" obtained by the above composition ratio is about 730°C, and the liquidus temperature is about 765°C (experimental error is taken into account), with FB102 (QJ102) flux, See the data in brackets for the brazing joint strength when the brazing base material is the following combination: copper-brass (σ b =200±15MPa, τ=170±10MPa), brass-carbon steel (σ b =280±15MPa, τ=250±10MPa), stainless steel-nickel-based alloy (σ b =335±15MPa, τ=310±10MPa).

Embodiment 2

[0018] According to the mass percentage ratio, its composition is: 40.0% Cu, 42.0% Zn, 4.0% Sn, 0.001% Li, 0.1% Nb, and the rest is Ag.

[0019] The solidus temperature of the "cadmium-free silver solder containing lithium and niobium" obtained by the above composition ratio is about 735°C, and the liquidus temperature is about 770°C (considering the experimental error), and FB102 (QJ102) flux, See the data in brackets for the brazing joint strength when the brazing base material is the following combination: copper-brass (σ b =200±15MPa, τ=170±10MPa), brass-carbon steel (σ b =280±15MPa, τ=250±10MPa), stainless steel-nickel-based alloy (σ b =335±15MPa, τ=310±10MPa).

Embodiment 3

[0021] According to the mass percentage ratio, its composition is: 40.0% Cu, 52.0% Zn, 5.0% Sn, 0.01% Li, 0.001% Nb, and the rest is Ag.

[0022] The solidus temperature of the "cadmium-free silver solder containing lithium and niobium" obtained by the above composition ratio is about 725 ° C, and the liquidus temperature is about 760 ° C (considering the experimental error), with FB102 (QJ102) flux, The data of base metal and brazing seam strength for brazing are the same as in Example 1.

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Abstract

The invention belongs to the field of welding material, in particular relating to a cadmium-free silver filler containing lithium and niobium and a production method thereof; the chemical composition of the cadmium-free silver filler is as follows according to mass percent: 35.0%-40.0% of Cu, 42.0%-52.0% of Zn, 4.0%-6.0% of Sn, 0.001%-0.1% of Li, 0.001%-0.1% of Nb, and the balancing of Ag. In the invention, Nb and Li are added in sequence, so that the purity of the tissue of the silver filler can be obviously improved, thus improving the wettability and spreadability of the silver filler. The invention has low silver content, excellent braze welding performance, no toxic cadmium in the welded parts during welding or after welding, can replace Bag35CuZnCd brazing filler and Bag25CuZn brazing filler, and is applicable to braze welding for metal materials such as copper, brass, carbon steel, stainless steel, and nickel base alloy, etc.

Description

technical field [0001] The invention belongs to welding materials, in particular to a cadmium-free silver solder containing lithium and niobium and a production method thereof. Background technique [0002] At present, the solders commonly used in the welding process at home and abroad are generally cadmium-containing silver solders BAg35CuZnCd and BAg40CuZnCd, which contain a large amount of "toxic element" cadmium (Cd) in their chemical composition. Due to the toxicity of solder containing spacers, the use of this cadmium-containing solder in home appliances has begun to be banned at home and abroad. Therefore, it is necessary to research and develop alternative products that do not contain cadmium. However, although some new products of cadmium-free silver solder have been developed at home and abroad, because the silver content of these products is high, generally more than 25% (mass percentage), the material cost is greatly improved. In order to reduce manufacturing co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/24B23K35/28B23K35/40
Inventor 张玉海
Owner JINHUA SANHUAN WELDING MATERIALS
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