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Al-Si-Cu-Ni series brazing filler metal for connecting Cu/Al connector and preparation method of Al-Si-Cu-Ni series brazing filler metal

A technology of al-si-cu-ni and brazing filler metal, which is applied in the field of Al-Si-Cu-Ni brazing filler metal connecting Cu/Al joints and its preparation, can solve the problem of base material grain growth, corrosion, and influence on joints Mechanical properties and other issues, to achieve high strength, good corrosion resistance, and improve plasticity

Active Publication Date: 2021-06-18
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional aluminum-silicon eutectic solder has a high melting point, which is close to the solidus temperature of the aluminum base material, which easily leads to problems such as grain growth and corrosion of the base metal; in addition, when brazing copper and aluminum base metals, the A large number of brittle intermetallic compounds will be generated, which will affect the mechanical properties of the joint
Therefore, it is necessary to compound alloy elements and control the ratio of elements in the solder to regulate the melting temperature and interface reaction of the solder to achieve high-quality connection of copper-aluminum dissimilar joints, but there is no corresponding report so far. research is particularly important

Method used

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  • Al-Si-Cu-Ni series brazing filler metal for connecting Cu/Al connector and preparation method of Al-Si-Cu-Ni series brazing filler metal
  • Al-Si-Cu-Ni series brazing filler metal for connecting Cu/Al connector and preparation method of Al-Si-Cu-Ni series brazing filler metal
  • Al-Si-Cu-Ni series brazing filler metal for connecting Cu/Al connector and preparation method of Al-Si-Cu-Ni series brazing filler metal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of composition mass ratio of the Al-Si-Cu-Ni series brazing filler metal that is used to connect Cu / Al joint is: 10% Si, 2% Cu, 2% Ni, the balance is Al, and its preparation method comprises the following steps :

[0032] 1) According to the ratio of materials used, all metal raw materials are weighed;

[0033] 2) Put all the raw materials into the crucible of the smelting furnace, and smelt under the protection of NaCl and KCl molten salt with a mass ratio of 1:1;

[0034] 3) The melting temperature is 650°C, keep warm for 30 minutes, and stir once every 10 minutes to ensure that the solder alloy composition is uniform;

[0035] 4) Casting into an ingot, rolling and drawing to make a foil to obtain an Al-Si-Cu-Ni based brazing filler metal for connecting Cu / Al joints.

Embodiment 2

[0037] A kind of composition mass ratio of the Al-Si-Cu-Ni series brazing filler metal that is used to connect Cu / Al joint is: 10% Si, 4% Cu, 2% Ni, the balance is Al; Its preparation method comprises the following steps :

[0038] 1) According to the ratio of materials used, all metal raw materials are weighed;

[0039] 2) Put all the raw materials into the crucible of the smelting furnace, and smelt under the protection of NaCl and KCl molten salt with a mass ratio of 1:1;

[0040] 3) The melting temperature is 650°C, keep warm for 35 minutes, and stir once every 10 minutes to ensure that the solder alloy composition is uniform;

[0041] 4) Casting into an ingot, rolling and drawing to make a foil to obtain an Al-Si-Cu-Ni based brazing filler metal for connecting Cu / Al joints.

Embodiment 3

[0043] A kind of composition mass ratio of the Al-Si-Cu-Ni series brazing filler metal that is used to connect Cu / Al joint is: 10% Si, 6% Cu, 2% Ni, the balance is Al; Its preparation method comprises the following steps :

[0044] 1) According to the ratio of materials used, all metal raw materials are weighed;

[0045] 2) Put all the raw materials into the crucible of the smelting furnace, and smelt under the protection of NaCl and KCl molten salt with a mass ratio of 1:1;

[0046] 3) The melting temperature is 650°C, keep warm for 35 minutes, and stir once every 10 minutes to ensure that the solder alloy composition is uniform;

[0047] 4) Casting into an ingot, rolling and drawing to make a foil to obtain an Al-Si-Cu-Ni based brazing filler metal for connecting Cu / Al joints.

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Abstract

The invention discloses Al-Si-Cu-Ni series brazing filler metal for connecting a Cu / Al connector and a preparation method of the Al-Si-Cu-Ni series brazing filler metal. The Al-Si-Cu-Ni series brazing filler metal for connecting the Cu / Al connector comprises, by weight, 8-12% of silicon, 2-10% of copper, 1-4% of nickel, 0-0.3% of erbium, 0-0.3% of zirconium and the balance aluminum. The preparation method comprises the steps of raw material selection, alloy smelting, stirring and ingot casting. The brazing filler metal provided by the method is good in plasticity and has relatively appropriate brazing temperature, and an obtained copper-aluminum brazed connector is high in strength and good in corrosion resistance; and the brazing temperature of the brazing filler metal is low and is generally about 590 DEG C, the brittleness of the connector is small, the strength is higher, the highest shear strength of the brazing filler metal can reach 98.12 MPa and is greatly higher than that of traditional brazing filler metal, and the novel copper-aluminum connector brazing filler metal with excellent performance is suitable for application and popularization.

Description

technical field [0001] The invention belongs to the field of welding technology, and relates to a brazing filler metal for copper, aluminum and its alloys, in particular to a brazing filler metal with relatively low brazing temperature, good plasticity, high welded joint strength and high corrosion resistance. Al-Si-Cu-Ni based solder for Cu / Al joints and a preparation method thereof. Background technique [0002] Aluminum alloys are widely used in industrial production and social life. For example, due to their small specific gravity, good electrical and thermal conductivity, excellent plasticity and machinability, aluminum alloys play an irreplaceable and important role in modern industrial materials. At present, 3-series and 6-series high-strength aluminum alloys are used to make all-aluminum structural parts to replace copper parts. This is because aluminum can reduce costs and reduce the weight of components. Therefore, this has become a manufacturing industry. However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/28B23K35/40
CPCB23K35/286B23K35/40
Inventor 杨建国冯印典贺艳明石磊刘玉章周正强李华鑫闾川阳郑文健马英鹤
Owner ZHEJIANG UNIV OF TECH
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