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Low-temperature vacuum diffusion connecting method for copper and zinc-based alloy

A technology of vacuum diffusion and connection method, which is applied in the direction of welding equipment, metal processing equipment, welding/welding/cutting items, etc. It can solve the problems of poor plasticity of joints, great difficulty in good bonding, and easy generation of air holes, etc., to achieve interface Combining Stability, Reliable Performance, and High Productivity

Inactive Publication Date: 2016-05-04
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual welding, when vacuum diffusion welding is used to connect copper and zinc-based alloys, it is still very difficult to achieve a good bond due to severe zinc evaporation, easy to produce pores, and poor joint plasticity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The T2 red copper with a thickness of 2mm and the ZA-8 zinc-based alloy with a thickness of 2mm are subjected to low-temperature vacuum diffusion connection, and the workpiece size is 40mm×80mm.

[0032] The specific process steps are as follows:

[0033] (1) Surface cleaning before welding

[0034] Use No. 150 and No. 280 metallographic sandpaper to polish the surface to be welded of the T2 copper plate and the ZA-8 zinc-based alloy plate to ensure that the test plate is smooth and clean. Use acetone to clean the surface of the test plate to remove oil and scale. Use 15% HCl to pickle the copper plate for 4 minutes, then rinse with alcohol, and dry it with a hair dryer before use to ensure that the surface of the test plate is clean and dry.

[0035] (2) Vacuum diffusion connection

[0036] Place the cleaned copper plate and the zinc-based alloy plate overlappingly between the upper and lower pressure heads of the diffusion connection, put them into the vacuum furnac...

Embodiment 2

[0040] The T2 red copper with a thickness of 4mm and the ZA-12 zinc-based alloy with a thickness of 3mm are connected by low-temperature vacuum diffusion welding, and the workpiece size is 60mm×60mm.

[0041] The specific process steps are as follows:

[0042] (1) Surface cleaning before welding

[0043] Use No. 100 and No. 250 metallographic sandpaper to polish the surface of the T2 copper plate and ZA-12 zinc-based alloy plate to be welded to ensure that the test plate is smooth and clean. Use acetone to clean the surface of the test plate to remove oil and scale. Use 5% HCl to pickle the copper plate for 6 minutes, then rinse with alcohol, and dry it with a hair dryer before use to ensure that the surface of the test plate is clean and dry.

[0044] (2) Vacuum diffusion connection

[0045] Place the cleaned copper plate and the zinc-based alloy plate overlappingly between the upper and lower pressure heads of the diffusion connection, put them into the vacuum furnace of t...

Embodiment 3

[0049] The T2 red copper with a thickness of 2mm and the ZA-8 zinc-based alloy with a thickness of 2mm are vacuum diffusion connected, and the workpiece size is 40mm×80mm.

[0050] The specific process steps are as follows:

[0051] (1) Surface cleaning before welding

[0052] Use No. 150 and No. 280 metallographic sandpaper to polish the surface to be welded of the T2 copper plate and the ZA-8 zinc-based alloy plate to ensure that the test plate is smooth and clean. Use acetone to clean the surface of the test plate to remove oil and scale. Use 15% HCl to pickle the copper plate for 4 minutes, then rinse with alcohol, and dry it with a hair dryer before use to ensure that the surface of the test plate is clean and dry.

[0053] (2) Vacuum diffusion connection

[0054] Place the cleaned copper plate and the zinc-based alloy plate overlappingly between the upper and lower pressure heads of the diffusion connection, put them into the vacuum furnace of the vacuum diffusion connec...

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PUM

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Abstract

The invention provides a vacuum diffusion connecting method for copper and zinc-based alloy. The vacuum diffusion connecting method comprises the following steps: bonding the surfaces, to be connected, of a copper material and zinc-based alloy together so as to form a contact surface; heating to a preset temperature under a 10<-3> to 10<-4> Pa vacuum condition; and under a pressure insufficient to cause plastic deformation and at the preset temperature, enabling the contact surface to be in a solid phase state, and promoting element diffusion so as to realize connection. The formed copper and zinc-based alloy diffusion welding joint is stable in interface bonding, even in element diffusion and reliable in performance, and can meet the use requirements of the engineering field on special copper and zinc joints. The low-temperature vacuum diffusion connecting method for copper and zinc-based alloy, related to the invention, is stable in technical process and high in production efficiency, can realize multi-piece massive production in one furnace, and is favorable to being popularized and applied in actual production. By adopting the technical method provided by the invention, the great diffusion combination of copper and zinc-based alloy interfaces can be realized, and the joint welding rate can reach 100%.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a low-temperature vacuum diffusion connection method for copper and zinc-based alloys. Background technique [0002] Copper and copper alloys have good thermal conductivity, electrical conductivity, ductility and corrosion resistance, and have important applications in the fields of heat exchangers and electrical equipment. Zinc-based alloys have excellent casting performance and can be used to produce parts with complex shapes, but their corrosion resistance is poor, and the size of the parts will change due to aging. Copper-zinc composite components can be formed by connecting copper and zinc-based alloys, giving full play to the complementary advantages of the two, and realizing special structural and functional requirements. [0003] When welding copper and zinc-based alloys, a large amount of copper-zinc intermetallic compounds, such as CuZn, Cu 5 Zn 8 , CuZn 3 etc., th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/14B23K20/24
CPCB23K20/14B23K20/24B23K2103/18
Inventor 李亚江刘坤
Owner SHANDONG UNIV
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