Al-Ag-Cu-Mg aluminium base alloy-state brazing filler metal and preparation method thereof

An al-ag-cu-mg, aluminum-based alloy technology, used in metal processing equipment, manufacturing tools, welding equipment, etc., can solve the problems of over-burning of base metal, poor corrosion resistance and brazing process, and achieve enhanced The effect of welding rate and welding strength, good brazing processability and good wettability

Inactive Publication Date: 2016-03-02
BEIJING INST OF NONFERROUS METALS & RARE EARTH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Al-Si-Cu, Al-Si-Ge, Al-Si-Zn, Al-Ag-Ge, Al-Ag-Cu, etc. are known to be brittle and are only suitable for casting bars and difficult to process. Foil-shaped solder, but poor corrosion resistance and brazing process
At present, there is no vacuum solder with low melting point and good corrosion resistance in China. Excessively high temperature will bring the risk of overburning of the base metal. At the same time, reducing the temperature of the solder can effectively avoid the influence of temperature on the base metal. Therefore, it is urgent to develop a melting temperature range. 450~530℃ brazing material solves the bottleneck of vacuum welding of 5A05\5A06 aluminum alloy

Method used

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  • Al-Ag-Cu-Mg aluminium base alloy-state brazing filler metal and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]Embodiment 1 prepares Al-Ag-Cu-Mg aluminum-based alloy solder (1)

[0042] Step I: Raw material selection

[0043] Aluminum: use high-purity aluminum with a purity of not less than 99.9%; use high-purity silver with a purity of not less than 99.9%; use oxygen-free copper for copper; magnesium: have a purity of not less than 99.99%.

[0044] Step II: Master Alloy Preparation

[0045] 1. Melting of Al-Cu50 master alloy

[0046] 1) Equipment: medium frequency induction furnace;

[0047] 2) Mold: water-cooled mold: 30×210×440mm;

[0048] 3) Ingredients: 10kg ingredients for each furnace;

[0049] 4) Operation: Weigh the aluminum ingot and the copper ingot respectively according to the weight ratio of 1:0.5. After adding aluminum ingots into the crucible, raise the temperature. After the aluminum ingots are melted, add copper ingots, raise the furnace temperature to 700°C, stir thoroughly, and cast the alloy after all the copper ingots are melted. The alloy casting tempe...

Embodiment 2

[0073] Embodiment 2 prepares Al-Ag-Cu-Mg aluminum-based alloy solder (two)

[0074] Step I: Raw material selection

[0075] Aluminum: use high-purity aluminum with a purity of not less than 99.9%; use high-purity silver with a purity of not less than 99.9%; use oxygen-free copper for copper; magnesium: have a purity of not less than 99.99%.

[0076] Step II: Master Alloy Preparation

[0077] 1. Melting of Al-Cu50 master alloy

[0078] 1) Equipment: medium frequency induction furnace;

[0079] 2) Mold: water-cooled mold: 30×210×440mm;

[0080] 3) Ingredients: 10kg ingredients for each furnace;

[0081] 4) Operation: Weigh the aluminum ingot and the copper ingot respectively according to the weight ratio of 1:0.5. After adding aluminum ingots into the crucible, heat up. After the aluminum ingots are melted, add copper ingots, raise the furnace temperature to 750°C, stir thoroughly, and cast the alloy after all the copper ingots are melted. The alloy casting temperature is 7...

Embodiment 3

[0105] Example 3 Preparation of Al-Ag-Cu-Mg Aluminum-Based Alloy Solder (3)

[0106] Step I: Raw material selection

[0107] Aluminum: use high-purity aluminum with a purity of not less than 99.9%; use high-purity silver with a purity of not less than 99.9%; use oxygen-free copper for copper; magnesium: have a purity of not less than 99.99%.

[0108] Step II: Master Alloy Preparation

[0109] 1. Melting of Al-Cu50 master alloy

[0110] 1) Equipment: medium frequency induction furnace;

[0111] 2) Mold: water-cooled mold: 30×210×440mm;

[0112] 3) Ingredients: 10kg ingredients for each furnace;

[0113] 4) Operation: Weigh the aluminum ingot and the copper ingot respectively according to the weight ratio of 1:0.5. After adding aluminum ingots into the crucible, heat up. After the aluminum ingots are melted, add copper ingots, raise the furnace temperature to 740°C, stir well, and cast the alloy after all the copper ingots are melted. The alloy casting temperature is 700°C....

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Abstract

The invention discloses an Al-Ag-Cu-Mg aluminium base alloy-state brazing filler metal and a preparation method thereof. The brazing filler metal is mainly used for vacuum brazing for aluminium alloys. The brazing filler metal is composed of the following ingredients with the following contents: 35-45wt% of Ag, 18-22wt% of Cu, 1.0-2.0wt% of Mg and the balance Al. The brazing filler metal has a low melting temperature, high brazing manufacturability, high wettability, and a high welding area ratio of greater than 90%; the brazing filler metal has a welding joint tensile strength sigma of not less than 90MPa and a shear strength tau of not less than 60MPa, and is applicable to intermediate-temperate or step vacuum brazing for many aluminium alloys of 3A21, 2A50, 6063, 6061, LF6 and the like. The preparation method comprises the steps of material preparation, intermediate alloy preparation, alloy casting, heat treatment, hot forging, rolling and the like. The preparation method is simple in method and beneficial to batch production. Foil-shaped brazing filler metal with a thickness of 0.03-2.00mm can be prepared by virtue of the method, and the brazing filler metal is more applicable to vacuum brazing for aluminium alloy members with large specifications.

Description

technical field [0001] The invention relates to graded welding of an Al-Ag-Cu-Mg aluminum-based alloy state alloy, which simultaneously fills the defect of poor corrosion resistance of an aluminum-based low-temperature solder, and belongs to the technical field of metallurgy and rolling processing. Background technique [0002] Brazing refers to using a metal whose liquidus temperature is lower than the solidus temperature of the base metal as the solder, heating the parts and the solder until the solder melts, using the solder to wet the base metal, filling the joint gap and interacting with the base metal A method of joining parts by dissolution and diffusion. The brazing of aluminum alloys is widely used, such as the manufacture of aluminum waveguides, evaporators, radiators and turbines, and plays an important role in the automotive, refrigeration, electronics, aviation and other industries. In the brazing process, if an alloy containing heavy metals (such as Pb, Sn) wi...

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 张国清黄晓猛祁宇蔡正旭李彬姚映君
Owner BEIJING INST OF NONFERROUS METALS & RARE EARTH
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