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No-cadmium brazing silver alloy containing Ga and Ce

A rare earth cerium and silver solder technology, applied in welding/cutting media/materials, welding media, metal processing equipment, etc., to ensure safety, good mechanical properties of brazing joints, ideal plasticity and comprehensive mechanical properties

Active Publication Date: 2009-02-04
CHANGSHU HUAYIN FILLER METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has been reported that cadmium-free silver solder containing gallium and rare earth cerium can replace cadmium-containing silver solder of BAg50CuZnCd and BAg40CuZnCd (Ni), there is no such thing as silver content close to BAg35CuZnCd and comprehensive performance close to BAg35CuZnCd , the report of cadmium-free silver solder that can replace BAg35CuZnCd

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] According to the proportion by weight percentage, its composition is: 30.0% copper (Cu), 35.0% zinc (Zn), 2.0% tin (Sn), 0.5% gallium (Ga), 0.10% cerium (Ce), the rest is silver (Ag ).

[0010] The solidus temperature of the "cadmium-free silver solder containing gallium and rare earth cerium" obtained by the above composition ratio is about 690°C, and the liquidus temperature is about 770°C (experimental error is considered), and FB102 (QJ102) flux , see the data in brackets for the braze joint strength when the brazing base metal is the following combination: copper-brass (σ b =180±15MPa, τ=160±10MPa), brass-carbon steel (σ b =260±15MPa, τ=200±10MPa), stainless steel-nickel-based alloy (σ b =300±15MPa, τ=230±10MPa).

Embodiment 2

[0012] According to the proportion by weight percentage, its composition is: 41.0% copper (Cu), 28.0% zinc (Zn), 0.01% tin (Sn), 2.0% gallium (Ga), 0.001% cerium (Ce), the rest is silver (Ag ).

[0013] The solidus temperature of the "cadmium-free silver solder containing gallium and rare earth cerium" obtained by the above composition ratio is about 685°C, and the liquidus temperature is about 760°C (experimental error is considered), and FB102 (QJ102) flux , see the data in brackets for the braze joint strength when the brazing base metal is the following combination: copper-brass (σ b =180±15MPa, τ=160±10MPa), brass-carbon steel (σ b =260±15MPa, τ=200±10MPa), stainless steel-nickel-based alloy (σ b =335±15MPa, τ=290±10MPa).

Embodiment 3

[0015] According to the proportion by weight percentage, its composition is: 35.0% copper (Cu), 30.0% zinc (Zn), 1.0% tin (Sn), 1.5% gallium (Ga), 0.03% cerium (Ce), the rest is silver (Ag ).

[0016] The solidus temperature of the "cadmium-free silver solder containing gallium and rare earth cerium" obtained by the above composition ratio is about 685°C, and the liquidus temperature is about 770°C (experimental error is considered), and FB102 (QJ102) flux , see the data in brackets for the braze joint strength when the brazing base metal is the following combination: copper-brass (σ b =180±15MPa, τ=160±10MPa), brass-carbon steel (σ b =260±15MPa, τ=200±10MPa), stainless steel-nickel-based alloy (σ b =300±15MPa, τ=200±10MPa).

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Abstract

The present invention belongs to the field of welding material, and is especially no-cadmium brazing silver alloy containing Ga and Ce. The no-cadmium brazing silver alloy consists of Cu 30.0-41.0 wt%, Zn 28.0-35.0 wt%, Sn 0.01-2.0 wt%, Ga 0.5-2.0 wt%, Ce 0.001-0.10 wt% and Ag for the rest. The no-cadmium brazing silver alloy has excellent mother material wettability, excellent spreading performance, capacity of forming brazing seam with excellent mechanical performance, low smelting point of main component alloy, ideal plasticity and comprehensive mechanical performance and no cadmium contamination.

Description

technical field [0001] The invention relates to a cadmium-free silver brazing material containing gallium and rare earth cerium, which belongs to brazing materials in the field of metal materials and metallurgy. Background technique [0002] The currently used silver solder BAg35CuZnCd contains 17.0%-19.0% cadmium (Cd) in its chemical composition. Due to the promulgation of the EU's "WEEE" and "RoHS" directives, the "directives" stipulate that materials containing cadmium will not be allowed to be used in many home appliances, and they will be implemented on July 1, 2006. The relevant laws and regulations of the Chinese government also It will come into effect on March 1, 2007. Therefore, research and development of cadmium-free substitute products has become a realistic problem that the industry seeks and urgently needs to solve. As an alternative product, it must also meet the following requirements: that is, it has good brazing performance, suitable solid-liquidus line,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30
Inventor 顾文华薛松柏顾立勇顾建昌
Owner CHANGSHU HUAYIN FILLER METALS