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High-strength aluminum alloy brazing filler metal with melting point being lower than 500 DEG C and preparation method thereof

A high-strength, aluminum alloy technology, applied in the field of aluminum alloy welding, can solve the problems of difficult to obtain performance brazed joints, joint strength reduction, lower melting point of solder, etc., achieve high strength, lower brazing temperature, and avoid overburning and eclipsed effect

Inactive Publication Date: 2012-10-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of Cu will make the material brittle and cause corrosion of the base metal during brazing, making it difficult to obtain a brazed joint with excellent performance; the addition of Ge will also greatly reduce the melting point of the solder, which is mainly compatible with Al-Ge The eutectic temperature of the crystal alloy (Al-51.6Ge) is 424°C, but Ge is expensive (currently Ge with a purity of 99.9% is about 8000 yuan / kg) and reduces the strength of the joint

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The steps of the preparation method of the high-strength aluminum alloy solder with a melting point lower than 500°C are as follows:

[0023] 1) Al-12Si master alloy and Cu, Ge, Ni, Sn, Mg, Sr, Bi, La with a purity greater than 99.6% are used as raw materials, and the components are: Si: 7.9~8.5, Cu: 14.0 in terms of mass percentage ~16.0, Ge: 7.0~8.0, Ni: 2.0~4.0, Sn: 2.0~3.0, Mg: 0.5~1.5, Sr: 0.55~0.65, Bi: 0.1~0.3, La: 0.5~1.0, the rest is Al, put Into the vacuum induction melting furnace, pump the vacuum to 4.0×10 -3 Pa, filled with 0.05MPa pure argon for induction melting, fully alloyed and then poured into the water-cooled copper mold in the furnace to obtain a master alloy ingot with uniform composition;

[0024] 2) Break the master alloy ingot into small pieces and put it into the quartz tube in the vacuum spin quenching system, start the vacuum spin quenching system, and extract the vacuum of the induction furnace cavity to 4.0×10 -3 After the Pa is filled wi...

Embodiment 1

[0026] Using Al-12Si master alloy and Cu, Ge, Sn, Mg, Sr, Bi, La with a purity greater than 99.6% as raw materials, the composition is: Si: 8.29; Cu: 14.0; Ge: 8.0; Ni : 4.0; Sn: 2.0; Mg: 1.0; Sr: 0.65; Bi: 0.25; -3 Pa, filled with 0.05MPa pure argon for induction melting, fully alloyed and poured into the water-cooled copper mold in the furnace to obtain a cuboid 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, Sn, Mg, Sr, Bi 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 for protection, using a high-frequency induction coil to heat the master a...

Embodiment 2

[0028]Using Al-12Si master alloy and Cu, Ge, Sn, Mg, Sr, Bi, La with a purity greater than 99.6% as raw materials, the composition is: Si: 8.14; Cu: 16.0; Ge: 7.0; Ni : 3.0; Sn: 3.0; Mg: 1.5; Sr: 0.65; -3 Pa, filled with 0.05MPa pure argon for induction melting, fully alloyed and poured into the water-cooled copper mold in the furnace to obtain a cuboid 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, Sn, Mg, Sr, Bi 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 After Pa is filled with 0.05MPa pure argon gas protection, the master alloy in the quartz tube is heated by a high-frequen...

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Abstract

The invention discloses a high-strength aluminum alloy brazing filler metal with the melting point being lower than 500 DEG C and a preparation method thereof, belonging to the technical field of aluminum alloy welding. The brazing filler metal contains the following components in percentage by mass: 7.9-8.5 percent of Si, 14.0-16.0 percent of Cu, 7.0-8.0 percent of Ge, 2.0-4.0 percent of Ni, 2.0-3.0 percent of Sn, 0.5-1.5 percent of Mg, 0.55-0.65 percent of Sr, 0.1-0.3 percent of Bi, 0.5-1.0 percent of La and the balance of Al. The brazing filler metal is prepared by adopting a melt rapid cooling technology, has the melting point being lower than 500 DEG C and the brazing temperature from 520 DEG C to 530 DEG C, and is suitable for the brazing such as flame brazing, induction brazing, furnace brazing, gas-shielded brazing and the like of aluminum alloy with solidus curve of higher than 520 DEG C,. The brazing filler metal is in cooperation with QJ201 brazing LF21, and the shearing strength of a brazed joint is larger than 70MPa. The brazing filler metal has less content of Ge and lower cost.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy welding, in particular to a high-strength aluminum alloy solder with a melting point lower than 500°C and a preparation method thereof. Background technique [0002] Due to the advantages of low density and high specific strength, aluminum alloy is widely used in aviation, aerospace, petrochemical, automobile, machinery and other fields. Many traditional copper alloy waveguides, high-frequency devices, condensers, heat exchangers, etc. have been replaced by aluminum alloys. replace. As one of the important methods of aluminum alloy connection, brazing has the advantages of small deformation of brazing parts and high dimensional accuracy. It has been more and more widely used in actual production, and is especially suitable for manufacturing complex aluminum alloy components. The Al-Si series solder is based on the Al-Si eutectic composition. The eutectic alloy has good wettability, fluidit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/28B23K35/40
Inventor 罗伟严密史佩珍马天宇黄鹏王成林
Owner ZHEJIANG UNIV
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