Preparation method of intermediate-temperature aluminum-based aluminum alloy solder paste

An aluminum alloy, aluminum-based technology, applied in the direction of welding equipment, metal processing equipment, welding medium, etc., can solve the problems of unsuitable vacuum brazing method, poor corrosion resistance, electrochemical corrosion, etc., and achieve smooth sphericity Good, improve the strength and corrosion resistance, facilitate the effect of precise cloth

Inactive Publication Date: 2013-08-21
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest disadvantage of this product in practical application is that the brazing filler metal alloy system chooses Zn base (Zn-Al alloy), which will cause electrochemical corrosion, poor corrosion resistance, and is not suitable for vacuum brazing methods.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] a Brazing filler metal: the alloy composition is Cu1%, Ge40%, Al-12Si balance, (1) Distribute according to the brazing filler metal composition, put into the smelting container. (2) Pour the molten mixed salt with a mass ratio of NaCl:KCl=1:1 into a smelting container filled with brazing filler metal, put it in an argon protection furnace, and heat until the brazing filler metal melts. (3) Nitrogen atomization powder making. (4) Powder screening and classification The particle size range of the solder powder is 1-200 μm. (5) Vacuum pack the powder for use.

[0054] b brazing flux: cesium fluoroaluminate medium temperature brazing flux.

[0055] c solvent: dearomatized hydrocarbon D80.

[0056] d binder: molecular weight 2300 (active) polyisobutylene.

[0057] e Additive: tackifier (hardened castor oil).

[0058] Synthetic steps:

[0059] (1) First mix the brazing filler metal and the brazing flux at a ratio of 1:0.

[0060] (2) Mix the solvent, polyisobutylene an...

Embodiment 2

[0064] a Brazing filler metal: the alloy composition is Cu40%, Ge1%, Al-12Si balance, (1) Distribute according to the brazing filler metal composition, put into the smelting container. (2) Pour NaCl:KCl=1:1 molten mixed salt into a smelting container filled with solder, put it in an argon protection furnace, and heat the solder to melt. (3) Nitrogen atomization powder making. A stream of compressed nitrogen gas breaks the molten metal into small droplets, which condense into particles under a protective atmosphere. (4) Powder screening and classification The particle size range of the solder powder is 1-200 μm. (5) Vacuum pack the powder for use.

[0065] b brazing flux: cesium fluoroaluminate medium temperature brazing flux.

[0066] c solvent: dearomatized hydrocarbon D80.

[0067] d binder: molecular weight 2300 (active) polyisobutylene.

[0068] e additive: span20:span40=1:1.

[0069] Synthetic steps:

[0070] (1) First mix the brazing filler metal and the brazing f...

Embodiment 3

[0075] a Brazing filler metal: the alloy composition is Cu20%, Ge20%, Al-12Si balance, (1) Distribute according to the brazing filler metal composition, and put it into a smelting container. (2) Pour NaCl:KCl=1:1 molten mixed salt into a smelting container filled with brazing filler metal, put it in an inert body protection furnace, and heat the brazing filler metal to melt. (3) Nitrogen atomization powder making. A stream of compressed nitrogen gas breaks the molten metal into small droplets, which condense into particles under a protective atmosphere. (4) Powder screening and grading The particle size range of the solder powder is 1-200 μm (5) Vacuum packing the powder for use.

[0076] b brazing flux: cesium fluoroaluminate medium temperature brazing flux.

[0077] c solvent: dearomatized hydrocarbon D100.

[0078] d Binder: a mixture of molecular weight 2300 (active) polyisobutylene: molecular weight 50000 polyisobutylene = 10:5 at 80°C.

[0079] e additives: 0.

[00...

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Abstract

The invention relates to intermediate-temperature aluminum-based aluminum alloy solder paste and a preparation method thereof, and belongs to the field of soldering. The intermediate-temperature aluminum-based aluminum alloy solder paste comprises five parts: a, intermediate-temperature aluminum-based alloy powder, b, cesium fluoaluminate soldering flux or modified cesium fluoaluminate soldering flux, c, a solvent, d, a bonding agent, and e, an additive. The invention mainly provides an intermediate-temperature Al-Si-Cu-Ge solder alloy system which serves as an aluminum-based alloy, and is small in a solid-liquid interval, low in melting point, high in strength, low in soldering temperature and low in cost. The invention also provides a method for synthesizing the new intermediate-temperature aluminum-based solder paste. In the intermediate-temperature aluminum-based solder paste, the organic matter solvent and the bonding agent are harmless to human bodies, a few residues are generated after welding, and the viscosity is adjustable. The intermediate-temperature aluminum-based aluminum alloy solder paste is convenient to distribute accurately and is particularly suitable for weld joints with irregular shapes, the secondary processing of strips and wire rods due to distribution is avoided, and the defect of low corrosion resistance of Zn-based solders is overcome. The proportioning of the soldering flux and the solders is accurate, so the intermediate-temperature aluminum-based aluminum alloy solder paste is suitable for various soldering methods, and can be used for soldering 1 to 7 series of aluminum alloys.

Description

technical field [0001] The invention belongs to the technical field of brazing materials, and in particular relates to a novel medium-temperature aluminum-based aluminum alloy solder paste, focusing on the component design and preparation method of each component of the solder paste. Background technique [0002] At present, there are three main series of medium-temperature aluminum alloy solders: Zn-Al series, Ag-Al-Cu series, and Ge-Al-Si series. Through alloying, the researchers succeeded in lowering the melting point of the solder, but because it contains a lot of precious metal components, the production cost is high, and the solder needs to be processed into the shape required by the joint. However, the above solders are mostly brittle solders, which are difficult to process The welding consumables of the required shape of the joint, thus limiting its practical application and promotion. Therefore, reducing the content of precious metals and studying the processing an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/363B23K35/40
Inventor 李晓延金哲
Owner BEIJING UNIV OF TECH
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