Solder without cadmium and silver

A manufacturing method and technology of silver brazing filler metal are applied in the field of cadmium-free silver brazing filler metal and brazing material, which can solve the problems of non-conformity and high price, and achieve the effects of dense welding seam, high mechanical strength and smooth surface.

Active Publication Date: 2009-11-11
HANGZHOU HUAGUANG ADVANCED WELDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these silver solders contain a certain amount of harmful element cadmium (Cd), which does not meet the requirements of the EU RoHS directive, and these solders all contain high precious metal silver. Due to the limited resources of precious metal silver, the price is getting more and more expensive.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] According to the weight formula ratio of the alloy (cadmium-free silver solder, the same below), its composition is: copper: 28.5%, zinc: 30.5%, tin: 0.6%, silicon: 0.01%, mixed rare earth (rare earth elements lanthanum and cerium Main mixture, the same below): 0.1%, the rest is silver.

[0011] The solidus temperature of the "cadmium-free silver solder" obtained by the above composition ratio is about 625°C (reference value), the liquidus temperature is about 730°C (reference value), and FB102 flux is used, and the brazing base metal is as follows See the data in brackets for joint strength when combined: copper-copper alloy (σ b =230±20MPa, τ=195±15MPa), copper or copper alloy - stainless steel (σ b =340±20MPa, τ=250±15MPa), stainless steel-tungsten carbide (σ b =380±20MPa, τ=280±15MPa).

Embodiment 2

[0013] According to the weight formula ratio of the alloy, its composition is as follows: copper: 30%, zinc: 32%, tin: 2%, silicon: 0.5%, mixed rare earth: 0.05%, and the rest is silver.

[0014] The solidus temperature of the "cadmium-free silver solder" obtained by the above composition ratio is about 610°C (reference value), the liquidus temperature is about 710°C (reference value), and FB102 flux is used, and the brazing base metal is as follows See the data in brackets for joint strength when combined: copper-copper alloy (σ b =235±20MPa, τ=200±15MPa), copper or copper alloy - stainless steel (σ b =330±20MPa, τ=250±15MPa), stainless steel-tungsten carbide (σ b =360±20MPa, τ=270±15MPa).

Embodiment 3

[0016] According to the weight formula ratio of the alloy, its composition is as follows: copper: 32%, zinc: 33.5%, tin: 1%, silicon: 0.9%, mixed rare earth: 0.1%, and the rest is silver.

[0017] The solidus temperature of the "cadmium-free silver solder" obtained by the above composition ratio is about 630°C (reference value), the liquidus temperature is about 730°C (reference value), and FB102 flux is used, and the brazing base metal is as follows See the data in brackets for joint strength when combined: copper-copper alloy (σ b =230±20MPa, τ=200±15MPa), copper or copper alloy - stainless steel (σ b =320±20MPa, τ=260±15MPa), stainless steel-tungsten carbide (σ b =370±20MPa, τ=270±15MPa).

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Abstract

The invention relates to a manufacturing method of a cadmium-free silver brazing material containing tin, silicon and mixed rare earth elements. The cadmium-free silver brazing material belongs to medium temperature brazing material, and its chemical composition is: copper: 28%-32%, zinc: 30% %~34%, tin: 0.5%~5%, silicon: 0.01%~1%, silver: 29%~41%, rare earth elements lanthanum and cerium: 0.001%~0.1%, the rest are impurities, and impurities are less than 0.01%. The melting temperature of the solder is 600° C. to 745° C. The medium frequency induction furnace is used for melting and pouring, and then the required solder is obtained by extrusion, drawing and molding. The solder completely removes the harmful element cadmium, meets the requirements of the EU RoHS directive, and eliminates environmental pollution. And it can completely replace silver brazing filler metals such as BAg50CuZnCd, BAg45CuZnCd and BAg45CuZn, used in conjunction with FB102 flux, and can be used for brazing copper and copper alloys, hard alloys, stainless steel pipe fittings and other workpieces. The brazing filler metal has the advantages of good wettability and fluidity, high mechanical strength of brazed joints, and good brazing process performance.

Description

Technical field: [0001] The invention relates to a cadmium-free silver solder containing tin, silicon and mixed rare earth elements, which belongs to medium-temperature brazing materials, is suitable for brazing workpieces such as copper and copper alloys, hard alloys, and stainless steel pipe fittings, and belongs to the category of metal materials and Brazing materials in the field of metallurgy. Background technique: [0002] The currently used silver-containing solders BAg50CuZnCd, BAg45CuZnCd and BAg45CuZn are widely used in the brazing of industries such as refrigeration, machinery, electromechanical, electrical appliances, instruments and meters, and valve fittings. However, these silver solders contain a certain amount of harmful element cadmium (Cd), which does not meet the requirements of the EU RoHS directive, and these solders all contain high precious metal silver. Due to the limited resources of precious metal silver, the price is getting more and more expensiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/24B23K35/40C22C1/03
Inventor 金李梅王晓蓉舒俊胜刘静余丁坤
Owner HANGZHOU HUAGUANG ADVANCED WELDING MATERIALS CO LTD
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