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A kind of al-cu-ag-ge-mg-ti aluminum-based medium temperature vacuum solder and its preparation method

An al-cu, vacuum technology, applied in welding equipment, manufacturing tools, metal processing equipment, etc., can solve the problems of reducing the performance of brazing joints, increasing the brittleness of the brazing filler metal, and poor processability of the brazing filler metal, so as to achieve good brazing processability. , the effect of reducing erosion and improving strength

Active Publication Date: 2019-05-03
BEIJING INST OF NONFERROUS METALS & RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of solder has a high melting point (eutectic temperature of Al-Si alloy is 577°C), and its brazing temperature is mostly above 600°C, which is close to the melting point of some aluminum alloys such as 2A50, 6061, 6063 to be connected, and is very easy to weld. Causes over-burning and corrosion of the base metal, thereby reducing the performance of the brazed joint. Therefore, it is necessary to develop an aluminum alloy medium-temperature vacuum brazing filler metal with a lower melting point.
At present, many studies add Cu element on the basis of Al-Si system to reduce the melting point temperature. The addition of a large amount of Cu not only reduces the melting point of the solder, but also greatly increases the brittleness of the solder, making the processability of the solder extremely poor.

Method used

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  • A kind of al-cu-ag-ge-mg-ti aluminum-based medium temperature vacuum solder and its preparation method
  • A kind of al-cu-ag-ge-mg-ti aluminum-based medium temperature vacuum solder and its preparation method
  • A kind of al-cu-ag-ge-mg-ti aluminum-based medium temperature vacuum solder and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 prepares Al-Cu-Ag-Ge-Mg-Ti aluminum-based vacuum solder (1)

[0035] Step 1 Ingredients:

[0036] The raw materials were weighed according to the mass percentage of each component: Cu 15.0wt%, Ag 15.0wt%, Ge 5.0wt%, Mg 1.0wt%, Ti 0.01%, Al balance.

[0037] Step 2 prepares the master alloy:

[0038] Preparation of Al-50Cu master alloy: add aluminum ingot to the graphite crucible of non-vacuum induction furnace, raise the temperature until the aluminum ingot is melted, raise the furnace temperature to 800°C, press oxygen-free copper into the aluminum liquid, the mass ratio of copper to aluminum is 1:1, fully stirred, after the oxygen-free copper is completely melted, keep warm for 5 minutes, start casting into double water-cooled cast iron molds, and cast into an ingot with a thickness of 30mm. The casting temperature of the alloy is 750°C.

[0039] Step 3 alloy drawing casting

[0040] Alloy drawing casting is carried out by double vacuum continuous cas...

Embodiment 2

[0048] Example 2 Preparation of Al-Cu-Ag-Ge-Mg-Ti Aluminum-Based Vacuum Solder (2)

[0049] Step 1 Ingredients:

[0050] The raw materials were weighed according to the mass percentage of each component: Cu 20.0wt%, Ag 20.0wt%, Ge 10.0wt%, Mg 2.5wt%, Ti 0.25wt%, Al balance.

[0051] Step 2 prepares the master alloy:

[0052] Preparation of Al-50Cu master alloy: add aluminum ingot to the graphite crucible of non-vacuum induction furnace, raise the temperature until the aluminum ingot is melted, raise the furnace temperature to 820°C, press oxygen-free copper into the aluminum liquid, the mass ratio of copper to aluminum is 1:1, fully stirred, after the oxygen-free copper is completely melted, keep warm for 5 minutes, start casting into double water-cooled cast iron molds, and cast into an ingot with a thickness of 30mm. The casting temperature of the alloy is 780°C.

[0053] Step 3 alloy drawing casting

[0054] Alloy drawing casting is carried out by double vacuum continuo...

Embodiment 3

[0061] Example 3 Preparation of Al-Cu-Ag-Ge-Mg-Ti Aluminum-based Vacuum Solder (3)

[0062] Step 1 Ingredients:

[0063] The raw materials were weighed according to the mass percentage of each component: Cu 25wt%, Ag 25wt%, Ge 15wt%, Mg 5wt%, Ti 0.5wt%, Al balance.

[0064] Step 2 prepares the master alloy:

[0065] Preparation of Al-50Cu master alloy: add aluminum ingot to the graphite crucible of non-vacuum induction furnace, raise the temperature until the aluminum ingot is melted, raise the furnace temperature to 850°C, press oxygen-free copper into the aluminum liquid, the mass ratio of copper to aluminum is 1:1, fully stirred, after the oxygen-free copper is completely melted, keep warm for 5 minutes, start casting into double water-cooled cast iron molds, and cast into an ingot with a thickness of 30mm. The alloy casting temperature is 800°C.

[0066] Step 3 alloy drawing casting

[0067] Alloy drawing casting is carried out by double vacuum continuous casting machi...

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Abstract

The invention discloses Al-Cu-Ag-Ge-Mg-Ti aluminum-based medium temperature vacuum brazing filler metal and a preparation method thereof. The brazing filler metal comprises 15-25wt% of Cu, 15-25wt% of Ag, 5-15wt% of Ge, 1-5wt% of Mg, 0.01-0.5wt% of Ti and the balance Al. The melting temperature of the brazing filler metal is low and is 460-500 DEG C, aluminum alloy vacuum brazing can be realized at the temperature of 520-530 DEG C, brazing manufacturability is good, and good wettability is achieved; and the brazing wetting angle is smaller than or equal to 20 degrees, the ratio of welding area is larger than or equal to 90%, the tensile strength of welded joints is larger than or equal to 95MPa, and the Al-Ag-Ge-Mg-Ti aluminum-based medium temperature vacuum brazing filler metal and the preparation method thereof are suitable for medium temperature brazing and classified vacuum brazing of various sorts of aluminum alloy. The preparation method includes the steps of burdening, intermediate alloy preparation, alloy cast drawing, solid solution treatment, hot extrusion, constant temperature rolling and precision equal deformation rolling. By the adoption of the preparation method, foil-shaped brazing filler metal with the thickness specification being 0.10+ / -0.05mm and the width specification being larger than 100mm can be prepared.

Description

technical field [0001] The invention relates to an Al-Cu-Ag-Ge-Mg-Ti aluminum-based medium-temperature vacuum solder and a preparation method thereof, which is mainly used for medium-temperature vacuum brazing of aluminum alloys and belongs to the technical field of metallurgy and calendering. Background technique [0002] Aluminum and its alloys are the most widely used structural materials among non-ferrous metals. They have the advantages of low density, high strength and corrosion resistance, so they are widely used in building construction, mechanical equipment, transportation, electrical, shipbuilding, chemical industry, aerospace and military industry and other fields. The wide application of aluminum and aluminum alloys puts forward new requirements for the connection technology of aluminum and aluminum alloys. Brazing is one of the most commonly used methods for aluminum alloy connections. The development of brazing materials and brazing technology largely determine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/28B23K35/40
CPCB23K35/286B23K35/40
Inventor 唐超李刚宋文杰郭菲菲祁宇张翕
Owner BEIJING INST OF NONFERROUS METALS & RARE EARTH