Aluminum alloy constant-strength diffusion connecting method

A diffusion connection and aluminum alloy technology, which is applied in welding equipment, metal processing equipment, non-electric welding equipment, etc., can solve the problems of poor mechanical properties of aluminum alloy connection joints, achieve the effect of preventing secondary oxidation, improving strength and elongation

Inactive Publication Date: 2014-10-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the disadvantages of poor mechanical properties of aluminum alloy joints in existing di

Method used

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  • Aluminum alloy constant-strength diffusion connecting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Vacuum diffusion welding of aluminum alloy 6063 and aluminum alloy 6063.

[0016] Select two pieces of size A rod-shaped aluminum alloy 6063 (Al-Mg-Si series) is used as a welding piece. First, sand the surface of aluminum alloy 4 to be welded to 2000 # , Then polish to make the surface roughness Ra value of aluminum alloy 4 to be welded 0.02μm; then put the aluminum alloy 4 to be welded surface in 15% NaOH solution for 60s, then rinse with water, and then aluminum alloy 4 to be welded The surface is cleaned in 30% HNO3 solution for 30 seconds, and finally the aluminum alloy 4 to be welded parts are placed in alcohol, ultrasonically cleaned for 60 seconds, and then dried with cold air, and a layer of hexyl mercaptan is immediately uniformly coated on the aluminum alloy 4 to be welded surface (CH 3 -(CH 2 )-CH 2 -SH) Organic liquid film 2. Two pieces of aluminum alloy 4 with hexamethylene mercaptan organic liquid film 2 to be welded are brought into contact wit...

Embodiment 2

[0018] Example 2: Vacuum diffusion welding of aluminum alloy 5056 and aluminum alloy 5056.

[0019] Select two pieces of size The rod-shaped aluminum alloy 5056 (Al-Mg series) is used as the weldment. First, sand the surface of aluminum alloy 4 to be welded to 2000 # , Then polish to make the surface roughness Ra value of aluminum alloy 4 to be welded 0.03μm; then put the surface of aluminum alloy 4 to be welded in 15% NaOH solution for 90s, then rinse with water, and then aluminum alloy 4 to be welded The surface is cleaned in 30% HNO3 solution for 50s, and finally the aluminum alloy 4 parts to be welded are placed in alcohol, ultrasonically cleaned for 30 seconds, and then dried with cold air, and a layer of hexyl mercaptan is immediately uniformly coated on the aluminum alloy 4 to be welded surface (CH 3 -(CH 2 )-CH 2 -SH) Organic liquid film 2. Two pieces of aluminum alloy 4 with hexamethylene mercaptan organic liquid film 2 to be welded are brought into contact with each o...

Embodiment 3

[0021] Example 3: Vacuum diffusion welding of aluminum alloy 2024 and aluminum alloy 2024.

[0022] Select two pieces of size A rod-shaped aluminum alloy 2024 (Al-Cu series) is used as the workpiece to be welded. First, sand the surface of aluminum alloy 4 to be welded to 2000 # , And then polished to make the surface roughness Ra value of aluminum alloy 4 to be welded 0.05μm; then the surface of aluminum alloy 4 to be welded is cleaned in 15% NaOH solution for 75s, then rinsed with water, and aluminum alloy 4 is to be welded The surface is cleaned in 30% HNO3 solution for 60 seconds, and finally the aluminum alloy 4 to be welded parts are placed in alcohol, ultrasonically cleaned for 50 seconds, and then dried with cold air, and a layer of hexyl mercaptan is immediately uniformly coated on the aluminum alloy 4 to be welded surface (CH 3 -(CH 2 )-CH 2 -SH) Organic liquid film 2. Two pieces of aluminum alloy 4 with hexamethylene mercaptan organic liquid film 2 to be welded are b...

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Abstract

The invention discloses an aluminum alloy constant-strength diffusion connecting method which is used for solving the technical problem that in an existing diffusion connecting method, the mechanical property of an aluminum alloy connecting joint is poor. According to the technical scheme, passivation is carried out on a hexanethiol organic liquid membrane to remove an oxidation membrane of an aluminum alloy to-be-welded surface, the aluminum alloy to-be-welded surface is adopted, a single-layer self-assembling molecular membrane is formed on the aluminum alloy to-be-welded surface through bonding of Al-S bonds, secondary oxidation on an aluminum alloy to-be-welded piece in the stove charging and vacuumizing process is avoided, when the temperature in a stove rises to 154 DEG C, hexanethiol is escaped out of the aluminum alloy to-be-welded surface to be volatilized to enable Al atoms on the aluminum alloy to-be-welded surface to be in contact, and aluminum alloy effective connection when the diffusion welding temperature is achieved is accordingly achieved. By means of the aluminum alloy constant-strength diffusion connecting method, the mechanical property of the aluminum alloy connecting joint can be improved. Tests show that the aluminum alloy connecting joint obtained with the method achieves 85%-100% of after-welded base materials, and the extension rate of the aluminum alloy connecting joint achieves 10%-21%.

Description

Technical field [0001] The invention relates to a diffusion bonding method, in particular to an aluminum alloy and other strength diffusion bonding method. Background technique [0002] The diffusion bonding of aluminum alloy and aluminum alloy has huge application potential in the field of layered solid manufacturing of precision parts. For the diffusion bonding of aluminum and aluminum alloys, after the first cleaning, the surface of the aluminum alloy with high activity is easy to form secondary oxidation, resulting in nano-scale Al 2 O 3 Although the thickness of this secondary oxide film is extremely thin, it has high thermal stability (Al 2 O 3 Its melting point is 2060℃), so it is difficult to decompose into the environment or matrix under diffusion welding temperature (500~600℃) and vacuum conditions, which hinders the atom diffusion and metallurgical bonding of the connected interface, which becomes the main factor in the decrease of the strength of the diffusion joint ....

Claims

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Application Information

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IPC IPC(8): B23K20/14B23K20/24B23K103/10
CPCB23K20/14B23K20/02B23K20/16B23K20/2336B23K20/24B23K2103/10
Inventor 熊江涛李京龙张赋升王昌盛
Owner NORTHWESTERN POLYTECHNICAL UNIV
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