A kind of aluminum alloy diffusion bonding method without intermediate layer

A technology of diffusion bonding and aluminum alloy, which is applied in welding equipment, metal processing equipment, welding/welding/cutting articles, etc., can solve the problems of low joint strength, poor welding accuracy of components, and increased brittleness tendency, etc., to achieve improved interface Improve the bonding quality, welding rate, and increase the effect of deformation and crushing

Active Publication Date: 2022-07-05
SHANGHAI SPACE PRECISION MACHINERY RES INST
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of dissimilar materials as the intermediate layer, it is very easy to form intermetallic compounds at the interface of the joint, which increases the tendency of brittleness and has a great impact on the performance of the joint
Since the dense oxide film formed on the surface of the aluminum alloy is very stable, it is very difficult to remove it during vacuum welding. Without an intermediate layer, it is difficult to completely remove it even through pressure deformation, which hinders the interdiffusion between interface atoms, and the joint strength formed is very high. Low
Although the strength of the weld seam can be increased by increasing the welding pressure, it also leads to poor welding accuracy of the components

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of aluminum alloy diffusion bonding method without intermediate layer
  • A kind of aluminum alloy diffusion bonding method without intermediate layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] After cleaning and degreasing the surface of the aluminum alloy to be welded, use sandpaper to polish the surface to be welded to remove the oxide film, and form a surface with a roughness of Ra0.8. Use sandblasting to form uniform and fine micron-scale pits on the surface, and then pass through alcohol ultrasonic waves. Cleaning further removes surface impurities. Apply a layer of activation protectant immediately after treatment and cleaning. The activation protective agent is prepared by mixing pure magnesium powder and diethylene glycol dimethyl ether, wherein the mass percent of the pure magnesium powder is 2%, and the rest is diethylene glycol dimethyl ether. The particle size of the pure magnesium powder in the activation protective agent is 30 μm, and uniformly mixed in proportion to prepare the activation protection agent. The two surfaces to be welded coated with the activation protective agent are assembled and put into the upper and lower molds, and the who...

Embodiment 2

[0035]After cleaning and degreasing the surface of the aluminum alloy to be welded, use sandpaper to polish the surface to be welded to remove the oxide film, and form a surface with a roughness of Ra0.8. Use sandblasting to form uniform and fine micron-scale pits on the surface, and then pass through alcohol ultrasonic waves. Cleaning further removes surface impurities. Apply a layer of activation protectant immediately after treatment and cleaning. The activation protection agent is prepared by mixing pure magnesium powder and diethylene glycol dimethyl ether, wherein the mass percent of the pure magnesium powder is 3%, and the rest is diethylene glycol dimethyl ether. The particle size of the pure magnesium powder in the activation protection agent is 40 μm, and uniformly mixed in proportion to prepare the activation protection agent. The two surfaces to be welded coated with the activation protective agent are assembled and put into the upper and lower molds, and the whol...

Embodiment 3

[0037] After the surface of the aluminum alloy to be welded is cleaned and degreasing, the surface to be welded is polished with sandpaper to remove the oxide film, and a surface with a roughness of Ra1.6 is formed. Cleaning further removes surface impurities. Apply a layer of activation protectant immediately after treatment and cleaning. The activation protective agent is prepared by mixing pure magnesium powder and diethylene glycol dimethyl ether, wherein the mass percent of the pure magnesium powder is 4%, and the rest is diethylene glycol dimethyl ether. The particle size of the pure magnesium powder in the activation protective agent is 50 μm, and uniformly mixed in proportion to prepare the activation protection agent. The two surfaces to be welded coated with the activation protective agent are assembled and put into the upper and lower molds, and the whole is put into the vacuum furnace. Vacuum the furnace body to 5×10 -3 After Pa, the heating was started, and the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention relates to an aluminum alloy diffusion connection method without an intermediate layer. The surface of the aluminum alloy to be welded is coated with a layer of activation protective agent and the diffusion connection is carried out in combination with a gradient pressing method. The coated magnesium-containing activation protective agent is completely volatilized during the welding process, and there is no residue on the welding surface. The gradient pressurization method is adopted, and the oxide film is broken by magnesium vapor and lower prestress in the high temperature range, and then the welding temperature is lowered to increase the welding pressure. The invention solves the problems of low strength and serious welding deformation of aluminum alloy direct diffusion connection welding, and is simpler and more efficient than the diffusion welding method of coating intermediate layer, and the strength is better than that of ordinary brazing, and is especially suitable for the flow channel with small size and the resistance to resistance. Cold plate products with high corrosion requirements.

Description

technical field [0001] The invention relates to a method for direct diffusion connection of aluminum alloy materials, and belongs to the technical field of welding. Background technique [0002] With the development of the aerospace industry, the structure has put forward higher requirements for light weight and functionality. The aluminum alloy components obtained by the traditional brazing method have problems such as easy plugging and dissolution of the brazing filler metal, while the aluminum alloy joints obtained by the transient liquid phase diffusion welding method also have problems such as low connection strength and high brittleness tendency of intermetallic compounds at the interface. The direct diffusion connection of aluminum alloy without transition layer can not only reduce the problem of brittle compounds caused by the intermediate layer, but also significantly improve the corrosion resistance. It is widely used in aerospace, machinery, chemical industry, ele...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/00B23K20/24B23K20/233B23K103/10
CPCB23K20/001B23K20/24B23K20/2336B23K2103/10
Inventor 陈旭马平义彭赫力刘海建韩兴李中权袁勇张小龙
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap