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Flux powder for brazing aluminum material and process for producing the flux powder

A flux and powder technology, applied in welding/cutting media/materials, welding equipment, manufacturing tools, etc., can solve the problems of inability to remove material oxide film, inability to expand, inability to show sufficient performance, etc., to achieve improvement Remove the effects of increased capacity, cheap economics, mobility and scalability

Inactive Publication Date: 2008-03-19
JEMCO INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the aforementioned KF-AlF 3 Flux-like fluxes have the disadvantage of not showing sufficient performance when brazing magnesium-containing aluminum-based materials
[0006] Therefore there is the following problem: currently used flux, when brazing the aluminum-based material containing Mg, needs to coat about 5 times the amount of coating when brazing the aluminum-based material that does not contain Mg, otherwise it will not be possible. There is a problem that the oxide film on the surface of the material cannot be removed until the expansion is sufficient

Method used

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  • Flux powder for brazing aluminum material and process for producing the flux powder
  • Flux powder for brazing aluminum material and process for producing the flux powder
  • Flux powder for brazing aluminum material and process for producing the flux powder

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Embodiment

[0062] Hereinafter, examples and comparative examples of the present invention will be described in detail together.

[0063]

[0064]First, aluminum hydroxide, hydrofluoric acid and potassium hydroxide are used as raw material compounds, and the raw material compounds are used according to the filler K / Al molar ratio and the filler F / Al molar ratio shown in Table 1 and Table 2 below, and make it in the following The wet reaction was carried out at the reaction temperatures shown in Tables 1 and 2 to prepare flux powder samples No.1 to No.32 having the composition ratios shown in Tables 1 and 2 below, respectively. Among the flux powder samples prepared, samples No.12 to No.24 correspond to flux powders of the present invention, and samples No.1 to No.11 and samples No.25 to No.32 are outside the scope of the present invention flux powder. Calculate the K of the prepared flux powder samples after heating at 500°C for 15 minutes 2 AlF 5 ·H 2 Weight loss due to desorption ...

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Abstract

The present invention provides a flux powder, which has good expansibility when brazing Mg-containing aluminum-based materials, the flux powder is non-corrosive and has excellent safety, is inexpensive and economical, and can be widely used in General purpose. The present invention provides an improved flux powder, which contains KAlF4, K2AlF5 and K2AlF5·H2O, and is used for brazing aluminum-based materials with a Mg content of 0.1-1.0% by weight. The improved characteristic composition is that it has K / Al A composition with a molar ratio in the range of 1.00 to 1.20 and a F / Al molar ratio in the range of 3.80 to 4.10. The total content of K2AlF5 and K2AlF5·H2O is 6.0 to 40.0% by weight, and the balance is KAlF4. Part or all of the crystal structure of K2AlF5·H2O It is at least one of K-deficient, F-deficient, or K- and F-deficient crystal structures.

Description

technical field [0001] The invention relates to a flux powder suitable for brazing magnesium-aluminum base materials and a preparation method of the flux powder. Background technique [0002] For a long time, aluminum-silicon (Al-Si) eutectic alloys, which have a slightly lower melting point than the aluminum-based materials, have been used as solders in the brazing of aluminum-based materials. In order to make the solder and the aluminum-based material bond well, it is necessary to remove the oxide film formed on the surface of the aluminum-based material, so a fluoride-based flux is used to remove the oxide film. Among them, including potassium fluoride (KF) - aluminum fluoride (AlF 3 ) complex (potassium fluoroaluminate) non-corrosive flux, which has the following excellent properties: it can be directly coated or spread on the surface of aluminum-based materials, it can be processed continuously in a nitrogen atmosphere furnace, brazing The flux film is stable after so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/363B23K35/40
CPCB23K35/3605B23K35/362B23K35/40B22F9/20
Inventor 本多一义斋藤悟
Owner JEMCO INC
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