Low-melting-point and high-intensity aluminum alloy powder brazing filler metal and preparing method of low-melting-point and high-intensity aluminum alloy powder brazing filler metal

An aluminum alloy, high-strength technology, applied in the field of aluminum alloy brazing, can solve problems such as the restriction of Al-Si series brazing material, and achieve the effect of narrow melting zone, avoiding overburning and corrosion, and uniform composition

Active Publication Date: 2014-12-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some special applications, such as the brazing of thin-walled aluminum plate-fin heat exchangers, the application of Al-Si solder is greatly restricted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for preparing low-melting-point high-strength aluminum alloy powder solder, comprising the steps of:

[0041] Put the raw material into the vacuum induction furnace, draw the vacuum to 1.0×10 -2 Pa, filled with 0.06MPa 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, Zn, Sr, Bi and rare earth elements La, Ce and Yb during the smelting process.

[0042] The raw material is composed of Si, Cu, Ge, Ni, Zn, Sr, Bi, La, Ce, Yb, Al, wherein the mass fraction of Si is 8.6%, the mass fraction of Cu is 16.5%, and the mass fraction of Ge is 9.5% %, the mass fraction of Ni is 4.5%, the mass fraction of Zn is 4.0%, the mass fraction of Sr is 0.75%, the mass fraction of Bi is 0.35%, the mass fraction of La is 0.40%, the mass fraction of Ce is 0.55%, The...

Embodiment 2

[0048] A method for preparing low-melting-point high-strength aluminum alloy powder solder, comprising the steps of:

[0049] Put the raw material into the vacuum induction furnace, draw the vacuum to 1.0×10 -2 Pa, filled with 0.06MPa 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, Zn, Sr, Bi and rare earth elements La, Ce and Yb during the smelting process.

[0050] The raw material is composed of Si, Cu, Ge, Ni, Zn, Sr, Bi, La, Ce, Yb, Al, wherein the mass fraction of Si is 9.0%, the mass fraction of Cu is 16.5%, and the mass fraction of Ge is 9.5% %, the mass fraction of Ni is 5.0%, the mass fraction of Zn is 5.0%, the mass fraction of Sr is 0.75%, the mass fraction of Bi is 0.40%, the mass fraction of La is 0.45%, the mass fraction of Ce is 0.50%, The...

Embodiment 3

[0056] A method for preparing low-melting-point high-strength aluminum alloy powder solder, comprising the steps of:

[0057] Put the raw material into the vacuum induction furnace, draw the vacuum to 1.0×10 -2 Pa, filled with 0.06MPa 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, Zn, Sr, Bi and rare earth elements La, Ce and Yb during the smelting process.

[0058] The raw material is composed of Si, Cu, Ge, Ni, Zn, Sr, Bi, La, Ce, Yb, Al, wherein the mass fraction of Si is 9.5%, the mass fraction of Cu is 17.0%, and the mass fraction of Ge is 9.0% %, the mass fraction of Ni is 4.5%, the mass fraction of Zn is 4.5%, the mass fraction of Sr is 0.70%, the mass fraction of Bi is 0.40%, the mass fraction of La is 0.40%, the mass fraction of Ce is 0.55%, The...

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Abstract

The invention discloses a high-intensity aluminum alloy powder brazing filler metal with the melting point being lower than 490 DEG C and a preparing method of the high-intensity aluminum alloy powder brazing filler metal with the melting point being lower than 490 DEG C, and belongs to the technical field of aluminum alloy brazing. The brazing filler metal comprises the following ingredients in parts by weight: 8.6 to 9.5 percent of Si, 16.5 to 17.5 percent of Cu, 8.5 to 9.5 percent of Ge, 4.5 to 5.0 percent of Ni, 4.0 to 5.0 percent of Zn, 0.70 to 0.75 percent of Sr, 0.35 to 0.40 percent of Bi, 0.40 to 0.45 percent of La, 0.40 to 0.55 percent of Ce, 0.10 to 0.20 percent of Yb and the balance Al. The brazing filler metal is prepared by adopting a flux rapid cooling-ball milling technology, the melting point is lower than 490 DEG C, the brazing temperature is 500 to 520 DEG C, and the brazing filler metal is applicable to aluminum alloy brazing with the solid phase line temperature higher than 500 DEG C, such as in-furnace brazing, vacuum brazing, induction brazing and flame brazing. The brazing filler metal is matched with QJ201 for brazing 3003 aluminum alloy, and the shearing intensity of a brazing joint is greater than 74MPa.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy brazing, in particular to a low-melting-point high-strength aluminum alloy powder solder and a preparation method thereof. Background technique [0002] Due to the advantages of low density, high specific strength and good corrosion resistance, aluminum alloy is widely used in aviation, aerospace, petrochemical, automobile, ship, machinery, electric power, household appliances and other fields. There are many welding methods that can be used for aluminum alloys, among which brazing is one of the most important welding methods. It has the advantages of small deformation of brazed parts and high dimensional accuracy, and is more and more widely used in actual production. It 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, fluidity, corrosion resistance and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/28B23K35/40
CPCB23K35/288B23K35/40
Inventor 罗伟严密王琪明宫海龙陆江旭马天宇姜银珠
Owner ZHEJIANG UNIV
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