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Fluoride brazing flux for copper-aluminum dissimilar metal and preparation method for fluoride brazing flux

A technology of dissimilar metals and fluorides, which is applied in the field of fluoride flux for copper and aluminum dissimilar metals and its preparation, can solve the problems of flux drop and inconvenience, and achieve the advantages of reduced flux cost, good activity and low melting point Effect

Active Publication Date: 2014-05-07
ZHEJIANG XINRUI WELDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the melting point of conventional cesium fluoroaluminate flux is about 480°C, while the melting point of commonly used Zn-15Al solder is about 450°C, which is inconsistent with the optimal brazing temperature matching where the melting point of the flux is lower than that of the solder. , it is very inconvenient in practice
This is especially obvious when using Zn-15Al solder as the skin and conventional cesium fluoroaluminate flux as the flux cored wire for flame brazing. Because the temperature of the metal skin is low, the metal skin melts first during flame brazing. Due to the lack of support of the metal skin, a large amount of flux falls without being able to enter the welding gap and remove the film.

Method used

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  • Fluoride brazing flux for copper-aluminum dissimilar metal and preparation method for fluoride brazing flux
  • Fluoride brazing flux for copper-aluminum dissimilar metal and preparation method for fluoride brazing flux

Examples

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Effect test

Embodiment 1

[0022] The copper-aluminum dissimilar metal fluoride flux of the present embodiment consists of the following components:

[0023] The mass percentage of each component of the flux is 43.75% of cesium fluoride, 35% of aluminum trifluoride, 21% of potassium fluoride, and 0.25% of copper difluoride, and the total mass percentage is 100%.

[0024] Prepare as follows:

[0025] 1. Weigh cesium fluoride, aluminum trifluoride, potassium fluoride, copper difluoride, zinc difluoride, lithium fluoride, ZnAl metal powder and other powders in proportion and mix them in a mortar;

[0026] 2. Add an appropriate amount of deionized water and grind to a paste;

[0027] 3. Transfer the paste flux to an oven for drying;

[0028] 4. Grind the dried flux into solder powder.

[0029] Zn-15Al is selected as the filler metal and brazed with flux. It is suitable for brazing copper-aluminum joints. It has good seam filling performance during brazing, and the brazed pipeline has excellent airtight p...

Embodiment 2

[0031] The copper-aluminum dissimilar metal fluoride flux of the present embodiment consists of the following components:

[0032] Cesium fluoride 42%, aluminum trifluoride 39%, potassium fluoride 18%, copper difluoride 0.15%, zinc difluoride 0.2%, pure zinc powder 0.65%, the total mass percentage is 100%.

[0033] Prepare brazing flux according to the preparation steps in Example 1, select Zn-15Al as the filler metal, and braze with the brazing flux, which is suitable for brazing copper-aluminum joints. The seam filling performance is good during brazing, and after brazing The pipeline has excellent airtight performance.

Embodiment 3

[0035] The copper-aluminum dissimilar metal fluoride flux of the present embodiment consists of the following components:

[0036] Cesium fluoride 37.6%, aluminum trifluoride 30.5%, potassium fluoride 29.5%, copper difluoride 0.45%, zinc difluoride 0.45%, lithium fluoride 1.5%, the total mass percentage is 100%.

[0037] Prepare brazing flux according to the preparation steps in Example 1, select Zn-15Al as the filler metal, and braze with the brazing flux, which is suitable for brazing copper-aluminum joints. The seam filling performance is good during brazing, and after brazing The pipeline has excellent airtight performance.

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Abstract

The invention relates to the field of brazing materials, in particular to fluoride brazing flux for copper-aluminum dissimilar metal and a preparation method for the fluoride brazing flux. The fluoride brazing flux consists of cesium fluoride, aluminum trifluorid, potassium fluoride, copper difluoride and assistant. The preparation method comprises the following steps: mixing the cesium fluoride, the aluminum trifluorid, the potassium fluoride, the copper difluoride, zinc difluoride and lithium fluoride powder with zinc powder or ZnAl alloyed powder in proportion, adding a proper amount of deionized water and grinding in a mortar to form paste, and then, drying and grinding.

Description

technical field [0001] The invention relates to the field of brazing materials, in particular to a fluoride flux for copper-aluminum dissimilar metals and a preparation method thereof. Background technique [0002] With the increasing depletion of domestic copper resources and the rise in copper prices caused by foreign imports in recent years, manufacturers in the refrigeration industry have gradually turned their attention to aluminum. "Replacing copper with aluminum" has become an inevitable trend in the transformation and development of the refrigeration industry, especially the heat exchanger industry. . Especially the newly developed all-aluminum micro-channel heat exchanger, the heat exchange efficiency is slightly improved compared with the traditional copper tube fin heat exchanger. However, due to the structural design of the product, some internal components of the air conditioner, such as the compressor outlet pipe and the four-way valve, must be made of copper....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/363B23K35/40
CPCB23K35/362B23K35/40
Inventor 戴玮王水庆杨金龙孙波娄银斌娄江
Owner ZHEJIANG XINRUI WELDING MATERIAL
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