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Diffusion welding method of magnesium alloy and pure copper or copper alloy

A diffusion welding, copper alloy technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of excessive growth of magnesium alloy grains, difficult to destroy and evaporate, unable to high diffusion coefficient, etc. The effect of high shear strength, reduced equipment requirements, and shortened experimental period

Active Publication Date: 2019-07-19
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These reasons will lead to residual stress after welding, which will reduce the performance of the joint
2) The difference in chemical properties, the lattice type, lattice constant, and atomic radius of the two are different
3) The affinity between magnesium and oxygen is extremely strong, and it is easy to combine with oxygen to form a stable oxide film, which is difficult to destroy and evaporate in the initial stage of diffusion welding, hindering the diffusion of elements
4) In order to avoid excessive growth of magnesium alloy grains, the diffusion welding temperature should not be higher than 500 ° C, and the Arrhenius formula shows that most solid metal materials cannot obtain a higher diffusion coefficient at such a temperature
[0004] At present, there is a method using magnetron sputtering or hot-dip plating, depositing a layer of coating in advance on the diffusion surface as an intermediate layer material, and then performing diffusion welding, but this method requires high equipment and complicated processes; A method of secondary diffusion welding at different temperatures, however, the cycle of secondary diffusion welding is longer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preferred embodiment of the present invention provides a diffusion welding method of magnesium alloy and pure copper. In this method, the material of mutual insoluble alloy is used as the intermediate layer material, and the material of the intermediate layer includes silver and bismuth. Magnesium alloy and copper are welded, specifically include the following steps:

[0034] S1. Silver is smelted into a liquid state with a mass accounting for 98% of the total mass of the intermediate layer material, and then added with bismuth powder whose mass accounts for 2% of the total mass of the intermediate layer material, stirred evenly, cast into a mold, and processed into a thin layer to obtain the intermediate layer Material;

[0035] S2. Magnesium alloy and pure copper are polished with 400#, 600#, 800#, 1000#, 1200# sandpaper in turn, polished with diamond polishing paste with a particle size of W2.5, and 1200# sandpaper is used for the middle layer material Grinding ...

Embodiment 2

[0038] A preferred embodiment of the present invention provides a method for diffusion welding of magnesium alloys and copper alloys. In this method, the material of the mutual insolubilization alloy is used as the intermediate layer material, and the intermediate layer material includes aluminum and tin. Vacuum diffusion welding technology is used to Magnesium alloy and copper alloy are welded, specifically include the following steps:

[0039] S1. Aluminum is smelted into a liquid state with a mass accounting for 99.5% of the total mass of the intermediate layer material, and then tin powder with a mass accounting for 0.5% of the total mass of the intermediate layer material is added, stirred evenly, cast into a mold, and processed into a thin layer to obtain the intermediate layer Material;

[0040] S2. Magnesium alloys and copper alloys are polished with 400#, 600#, 800#, 1000#, and 1200# sandpaper in turn, and diamond polishing paste with a particle size of W2.5 is used f...

Embodiment 3

[0043] A preferred embodiment of the present invention provides a diffusion welding method for magnesium alloy and pure copper. In this method, the material of the mutual insolubility alloy is used as the intermediate layer material, and the intermediate layer material includes iron and bismuth. Magnesium alloy and copper are welded, specifically include the following steps:

[0044] S1. Iron is smelted into a liquid state with the mass accounting for 99% of the total mass of the intermediate layer material, and then added with bismuth powder whose mass accounts for 1% of the total mass of the intermediate layer material, stirred evenly, cast into a mold, and processed into a thin layer to obtain the intermediate layer Material;

[0045] S2. Use 400#, 600#, 800#, 1000#, 1200# sandpaper to polish magnesium alloy and pure copper in turn, use diamond polishing paste with a particle size of W2.5 to polish, and use 1500# sandpaper for the middle layer material Grinding with sandpa...

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Abstract

The invention discloses a diffusion welding method of a magnesium alloy and pure copper or a copper alloy. An alloy material which is not in solid solution is used as an intermediate layer material, and a vacuum diffusion welding technique is adopted to weld the magnesium alloy and the copper or the copper alloy. The alloy which is not in solid solution comprises high-melting-point component metaland low-melting-point component metal, wherein the low-melting-point component metal acts as a liquid active factor at the vacuum diffusion welding temperature, the atom diffusion process is promoted, and a good welding joint is formed. By means of the diffusion welding method, the experiment cost is reduced, the requirement for the equipment is reduced, the experiment cycle is saved, and the process is simple and effective.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a diffusion welding method of magnesium alloy and pure copper or copper alloy. Background technique [0002] Magnesium alloy has the advantages of high specific strength, specific stiffness, good electrical conductivity, strong electromagnetic shielding and easy cutting. Copper and copper alloys have excellent electrical conductivity, good stability and strong corrosion resistance. Therefore, it is of great significance to realize high-quality connection of magnesium-copper dissimilar metals, which can meet the service requirements in special environments. As a rapidly emerging new green engineering structural material, magnesium alloy has broad application prospects in aerospace, national defense, automobile industry, electronic communication and other fields. The development and application of magnesium alloys is inseparable from the connection problem. Go...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/02B23K20/14B23K20/233B23K20/24
CPCB23K20/026B23K20/14B23K20/2333B23K20/24
Inventor 潘厚宏王震郭阳阳
Owner SOUTHWEST JIAOTONG UNIV
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