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Medium-temperature aluminum-based foil strap brazing material and preparation method thereof

A brazing material and base foil technology, applied in the field of aluminum alloy welding, can solve the problems of reducing joint strength, high Ge price, reducing the melting point of brazing filler metal, etc., so as to reduce the cost of brazing filler metal, avoid over-burning and erosion, and process consumption costs. low effect

Inactive Publication Date: 2015-04-29
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the amount of Cu added will make the solder brittle, the workability will decrease, and it will basically not be rolled into a foil strip; the addition of Ge will also greatly reduce the melting point of the solder, which is mainly related to the Al-Ge alloy (Al-51.6Ge). The eutectic temperature is 424°C, but Ge is expensive, and Ge is a brittle phase, and excessive addition will reduce the joint strength

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0017] The preparation method of the above-mentioned medium-temperature aluminum-based foil strip brazing filler metal comprises the following steps:

[0018] 1. Al, Si, Cu, Ge, Zn, La with a purity greater than 99.6% are used as raw materials, and the ratio by mass percentage is: Si: 6.5~9.6, Cu: 16.0~20.0, Ge: 8.0~10.0, Zn: 2.0~6.0, La: 0.5~1.0, the balance is Al, put it into a vacuum induction melting furnace, and draw a vacuum to 4.0×10 -3 Pa, filled with 0.05MPa of pure argon for induction melting, repeated smelting for 4 to 5 times and then poured into the iron mold in the furnace to obtain a master alloy ingot with uniform composition;

[0019] 2. Break the master alloy ingot obtained in step 1 into small pieces of 4 to 5 g, remove the oxide skin, and place it in acetone for ultrasonic cleaning;

[0020] 3. Put the small piece of master alloy obtained in step 2 into the quartz tube at the lower end of the vacuum spin quenching system, start the vacuum spin quenching sy...

Embodiment 1

[0028] Al, Si, Cu, Ge, Zn, La with a purity greater than 99.6% are used as raw materials, and the ratio by mass percentage is: Si: 6.5; Cu: 16.0; Ge: 10.0; Zn: 2.0; La: 0.5, the balance Take materials for Al, put them into a vacuum induction melting furnace, and draw a vacuum to 4.0×10 -3 Pa, filled with 0.05MPa of pure argon for induction melting, repeated smelting for 4, poured into the iron mold in the furnace to obtain a rod-shaped master alloy ingot. In order to ensure that the composition of the ingot meets the design composition, attention must be paid to the loss of Ge, Zn, and rare earth element La during the smelting process. After the master alloy ingot is prepared, it is taken out from the induction furnace and broken into small pieces, then put into the quartz tube in the vacuum spin quenching system, the vacuum spin quenching system is started, and the vacuum of the induction furnace chamber is drawn to 4.0×10 -3 Pa filled with 0.05MPa pure argon protection, usi...

Embodiment 2

[0030] Al, Si, Cu, Ge, Zn, La with a purity greater than 99.6% are used as raw materials, and the ratio by mass percentage is: Si: 8.3; Cu: 18.0; Ge: 9.0; Zn: 4.0; La: 1.0, the balance Take materials for Al, put them into a vacuum induction melting furnace, and draw a vacuum to 4.0×10 -3 Pa, filled with 0.05MPa of pure argon for induction melting, repeated smelting for 4, poured into the iron mold in the furnace to obtain a rod-shaped master alloy ingot. In order to ensure that the composition of the ingot meets the design composition, attention must be paid to the loss of Ge, Zn, and rare earth element La during the smelting process. After the master alloy ingot is prepared, it is taken out from the induction furnace and broken into small pieces, then put into the quartz tube in the vacuum spin quenching system, the vacuum spin quenching system is started, and the vacuum of the induction furnace chamber is drawn to 4.0×10 -3 Pa filled with 0.05MPa of pure argon protection, u...

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Abstract

The invention discloses a medium-temperature aluminum-based foil strap brazing material and a preparation method thereof. The brazing material comprises the following components by mass percentage: 6.5-9.6 of Si, 16.0-20.0 of Cu, 8.0-10.0 of Ge, 2.0-6.0 of Zn, 0.5-1.0 of La and the balance of Al. The brazing material is prepared by rapid cooling of a melt, the melting point is lower than 495 DEG C, a foil strap is suitable for brazing of aluminum alloy with the solidus temperature higher than 520 DEG C, torch brazing, induction brazing, furnace brazing, gas protection brazing and the like can be performed, the brazing temperature is 510-520 DEG C, and the brazing material can be applied in brazing of precision components made of aluminum alloy. When the brazing material is used with 5083 aluminum alloy for QJ201 brazing, the shear strength of a brazed joint is higher than 80MPa.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy welding, in particular to a medium-temperature aluminum-based foil strip solder and a preparation method thereof. Background technique [0002] Aluminum alloy has the advantages of high specific strength and corrosion resistance, and is widely used in the fields of automobiles, high-speed railway vehicles, aerospace and military industries. Due to its unique physical and chemical properties, a series of difficulties will be encountered in the welding process, such as weld thermal cracks, oxidation and pores. For the welding of aluminum alloys, the traditional method is mainly fusion welding, and the equipment is complicated. The technical requirements for welders are also strict. As an important method of aluminum alloy connection, aluminum brazing has the advantages of small deformation of brazing parts and high dimensional accuracy, and has been widely used in my country in recent years....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/28B23K35/40
Inventor 罗伟黄鹏严密王丽腾宫海龙马天宇吴朝育
Owner ZHEJIANG UNIV
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