Intermediate-temperature low-cesium fluoroaluminate brazing flux and preparation method thereof

A cesium fluoroaluminate and flux technology, which is applied in the field of medium-temperature and low-cesium fluoroaluminate flux and its preparation, can solve the problem of high content of noble metal salt CsF, the inability to realize large-scale industrial application, and the high price of flux. problems, to achieve the effect of easy large-scale industrial production, simple preparation method and good thermal stability

Active Publication Date: 2012-10-03
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0011] The object of the present invention is to solve the problem that the content of noble metal salt CsF is relatively high in low melting point, non-corrosive CsF-AlF3 flux , the price of flux is expensive, and it is impossible to realize the technical problem of large-scale industrial application

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  • Intermediate-temperature low-cesium fluoroaluminate brazing flux and preparation method thereof

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Embodiment Construction

[0022] The present invention will be further described below with examples, but the present invention is not limited to these examples.

[0023] The concrete composition of brazing flux of the present invention is as table 1;

[0024] Flux 1~flux 6 in table 1 is prepared according to the first preparation method in the present invention, concrete steps are: the analytical pure reagent aluminum trifluoride, potassium fluoride, potassium chloride, potassium bromide, cesium fluoride Dehydrate at 300°C for 4 hours; then put it into a vacuum drying oven and dry for 12 hours at 110°C and a vacuum of -0.07MPa; after drying, grind the reagent into powder; (2) according to claim 1 Weigh out the reagent powder and put it into the crucible, add deionized water at 60°C~100°C to make a uniform mixture; (3) Put the crucible with the mixture into a crucible at 150°C~400°C Heat in the furnace until the mixture boils, and boil for 5-10 minutes, stirring continuously until the mixture evaporat...

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Abstract

The invention discloses an intermediate-temperature low-cesium fluoroaluminate brazing flux and a preparation method thereof, can be applied to furnace brazing and flame brazing of pure aluminum and an aluminum alloy, and belongs to the field of brazing materials. The brazing flux consists of 32 to 42 mass percent of aluminum fluoride, 28 to 36 mass percent of potassium fluoride, 1 to 20 mass percent of cesium fluoride and 17 to 22 mass percent of one or two of potassium chloride and potassium bromide and can be prepared by a deionized water boiling method or a deionized water smelting method. The melting point of the brazing flux is 490 to 521 DEG C, the content of precious metal salt CsF ranges from 1 percent to 20 percent; a deliquescence phenomenon cannot occur in the air; postwelding brazing flux residues do not corrode joints, the flame adaptability is good, and the brazing flux is suitable for aluminum and aluminum alloy flame brazing and furnace brazing.

Description

[0001] technical field [0002] The invention relates to a medium-temperature low-cesium fluoroaluminate brazing flux and a preparation method thereof, belonging to the field of brazing materials for aluminum and aluminum alloys. Background technique [0003] Aluminum and aluminum alloys are widely used in industry because of their advantages such as low density, high thermal conductivity and high electrical conductivity. Compared with fusion welding and pressure welding, brazing has the advantages of small deformation and stress of welded joints, and high dimensional accuracy. It is a commonly used connection technology for aluminum and aluminum alloys. [0004] When brazing aluminum and aluminum alloys in flames or furnaces, it is first necessary to select appropriate brazing filler metals and low-melting point brazing fluxes. During the brazing process, the aluminum flux melts before the solder, removes the dense oxide film on the surface of aluminum and aluminum alloys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/363
Inventor 黄继华羊浩牛志伟李莉陈树海
Owner UNIV OF SCI & TECH BEIJING
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