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Low-melting-point intermediate-temperate aluminum brazing flux for brazing aluminum and aluminum alloy, and preparation method of low-melting-point intermediate-temperate aluminum brazing flux

A low melting point, aluminum flux technology, applied in the field of low melting point and medium temperature aluminum flux for brazing aluminum and its alloys and its preparation, can solve the problem of high brazing temperature, mismatched melting range of Zn-Al solder, and heat-treatable Aluminum alloy cannot be brazed and other problems, to achieve the effect of expanding the scope of application and good matching

Inactive Publication Date: 2016-04-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the above-mentioned deficiencies in the prior art, the present invention provides a low-melting-point medium-temperature aluminum brazing flux and a preparation method for brazing aluminum and its alloys, to solve the problem of mismatching with the conventional Zn-Al solder melting range and the brazing temperature. The problem that a large number of heat-treatable aluminum alloys cannot be brazed due to too high

Method used

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Examples

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preparation example Construction

[0014] The preparation method of the low-melting-point medium-temperature aluminum flux for brazing aluminum and its alloys of the present invention comprises the following steps:

[0015] 1) The medium temperature aluminum flux is used to analyze pure grade Al(OH) 3 Powder, CsCO 3 Powder, GeO 2 Powder and concentration of 10% hydrofluoric acid solution are raw materials for preparation, calculated according to the ratio of the mass percentage of the total content of each element in the above-mentioned medium-temperature aluminum flux component, and weighing the Al(OH) of the above-mentioned raw materials 3 Powder, CsCO 3 Powder, GeO 2 Powder and 10% concentration hydrofluoric acid solution.

[0016] 2) Al(OH) taken by step 1) 3 Put the powder into a plastic Erlenmeyer flask filled with distilled water, keep the water temperature at 80-85°C, and heat it in a water bath on a heating type magnetic stirrer for 15 minutes.

[0017] 3) Step 1) active material GeO that takes b...

Embodiment 1

[0036] The low-melting-point medium-temperature aluminum flux component used for brazing aluminum and its alloys of the present invention is to analyze pure grade Al(OH) 3 Powder, CsCO 3 Powder, GeO 2 Powder and 10% hydrofluoric acid solution are the raw materials for preparation, and the mass percentages of the total content of each element are: elemental aluminum (Al): 9.18%; elemental cesium (Cs): 62.41%; elemental fluorine (F): 28.31% ; Element germanium (Ge): 0.10%.

[0037] The preparation method comprises the following steps:

[0038] 1) Calculate and weigh the Al(OH) of the above-mentioned raw materials according to the mass percentage 3 Powder, CsCO 3 powder, GeO2 powder and 10% hydrofluoric acid solution.

[0039] 2) Al(OH) taken by step 1) 3 Put the powder into a plastic Erlenmeyer flask filled with distilled water, keep the water temperature at 80-85°C, and heat it in a water bath on a heating type magnetic stirrer for 15 minutes.

[0040] 3) Step 1) active ...

Embodiment 2

[0045] The low-melting-point medium-temperature aluminum flux component used for brazing aluminum and its alloys of the present invention is to analyze pure grade Al(OH) 3 Powder, CsCO 3 Powder, GeO 2 Powder and 10% hydrofluoric acid solution are the raw materials for preparation, and the mass percentages of the total content of each element are: elemental aluminum (Al): 8.82%; elemental cesium (Cs): 59.97%; elemental fluorine (F): 27.21% ; Element germanium (Ge): 4.00%.

[0046] The preparation method is: the same as the preparation method of Example 1.

[0047] The phase composition of the medium temperature aluminum brazing flux is determined by XRD as CsAlF 4 and Cs 2 GeF 6 It is the main phase, and the solid and liquidus lines of flux melting are measured by DSC as 432.5-438.4°C.

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Abstract

The invention provides a low-melting-point intermediate-temperate aluminum brazing flux for brazing aluminum and an aluminum alloy, which comprises the components: CsAlF4, Cs2AlF5 and Cs2GeF6, wherein mass percent ratios of the total contents of all elements in components are as follows: Al of 8.45-9.18%, Cs of 57.47-62.41%, F of 26.08-28.31% and Ge of 0.10-8.00%; the mass ratio of Al to Cs to F is 1 to 6.80 to 3.08. The invention also provides a preparation method of the low-melting-point intermediate-temperate aluminum brazing flux. The low-melting-point intermediate-temperate aluminum brazing flux has the beneficial effects that the melting point is 430-480 DEG C, and the brazing temperature can be controlled to be within 520 DEG C; the low-melting-point intermediate-temperate aluminum brazing flux can be used for brazing the aluminum alloy having the relatively low overburning temperature, widening the application range of brazing material, and brazing majority of heat-treatable aluminum alloy materials.

Description

technical field [0001] The invention relates to the technical field of brazing materials, in particular to a low-melting-point medium-temperature aluminum flux for brazing aluminum and its alloys and a preparation method thereof. Background technique [0002] Aluminum alloy occupies an important position and is widely used in modern industrial materials due to its excellent physical and chemical properties, good processing, surface treatment and corrosion resistance. The brazing process is the preferred method to realize the precise connection of various complex aluminum alloy devices. In the brazing process, flux is often used to remove the oxide film on the aluminum surface and reduce the interfacial tension between the molten solder and the base metal. [0003] The biggest disadvantage of the conventional Nocolok method of applying potassium fluoroaluminate flux is that the melting temperature of the flux is too high, exceeding the overburning temperature of most aluminu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/24B23K35/40
CPCB23K35/24B23K35/40
Inventor 程方杰何培龙赵欢肖兵
Owner TIANJIN UNIV
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