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Aluminum and aluminum alloy and copper diffusion brazing process

A brazing process and aluminum alloy technology, which is applied in metal processing equipment, welding media, manufacturing tools, etc., can solve the problems of inability to implement large-area bonding, high process operability requirements, and narrow application range, so as to control the corrosion phenomenon, The effect of low welding temperature and strong structural adaptability

Inactive Publication Date: 2015-06-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the flux is non-corrosive and does not need to be cleaned during the welding process, due to the flame brazing technology, the process operability requirements are high, and large-area bonding cannot be implemented, so its application range is narrow
[0007] In 2004, T.A.Mai and A.C.Spowage of the Singapore Institute of Manufacturing Technology used a 350WNd:YAG laser to realize the welding of 1mm thick pure copper and Al4047, analyzed the microstructure and microhardness at different welding rates, and determined the Al / Cu fusion The microhardness of the zone is high, and the results show that a large number of brittle intermetallic compounds are formed, and the joint strength is very poor
Since friction stir welding can usually only weld plates, its application range is narrow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Cut the 1060 pure aluminum plate and T2 copper plate into thin plates with dimensions of 5mm×5mm×2mm and 10mm×10mm×2mm by wire cutting, and then polish the two thin plates on 400# and 800# sandpaper to smooth, after ultrasonic cleaning Clean it with alcohol, then place the aluminum plate in 10% NaOH solution and 10% HNO 3 After soaking in the solution for 30s, wash it off with clean water. A uniform slurry made of alloy powder with a composition of 67Al-5Si-28Cu (wt%) is preset in the middle of the two plates, assembled with stainless steel fixtures in the order of aluminum plate-alloy powder-intermediate layer, the gap is controlled, and then Apply a pressure of 5.0MPa and place it in a vacuum furnace with a vacuum of 3.0×10 -3 Pa, keep warm at 525°C for 30 minutes, then cool with the furnace. When the temperature in the furnace is lower than 100°C, take out the sample and perform a shear strength test on an MST810 electronic universal testing machine. The test result...

Embodiment 2

[0022] In this example, the difference from Example 1 is that the base material is made of 5052 aluminum alloy and T2 red copper, and the composition of 65Al-7Si-28Cu (wt%) alloy powder is used as the intermediate layer, and the vacuum degree is 6.0×10 -3 Pa, the pressure is 3.0MPa, when the welding temperature is set to 525°C, the temperature is kept for 45 minutes, and the rest of the process steps are the same as in Example 1.

Embodiment 3

[0024] In this example, the difference from Example 1 is that the base material is 6061 aluminum alloy and T2 red copper, and the composition is 65Al-5Si-30Cu (wt%) alloy powder is used as the intermediate layer, and the vacuum degree is 5.0×10 -3 Pa, the pressure is 1.0MPa, when the welding temperature is set to 525°C, the temperature is kept for 60 minutes, and the rest of the process steps are the same as in Example 1.

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PUM

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Abstract

The invention discloses an aluminum and aluminum alloy and copper diffusion brazing process, and belongs to the field of dissimilar material connection. The process adopts Al-Si-Cu ternary alloy powder (the content of Si is 5%-7%, the content of Cu is 28%-30%, and the balance is Al, all in mass percent) as the connection materials, and under certain vacuum degree and certain pressure, heat is preserved at the temperature of 525-555 DEG C for 10-60 minutes, so connection between aluminum and aluminum alloy and copper can be realized. By adopting the method, liquid phase is formed by diffusion of Cu and Si atoms on an aluminum / oxidation film interface, and the oxidation film on the aluminum surface is removed, so as to realize metallurgical bonding, the joint is compact, the reliability is high, and the aluminum and aluminum alloy and copper diffusion brazing process is applicable to large area joint between pure aluminum and alloy thereof and copper and to welding of complex structural parts.

Description

technical field [0001] The invention relates to a diffusion brazing process of aluminum, aluminum alloy and copper, which belongs to the field of connection of dissimilar materials. Background technique [0002] Aluminum and copper are very common metals in daily life. Aluminum has a high content in the earth's crust, has a low density, and has good electrical and thermal conductivity. Copper's electrical and thermal conductivity is second only to silver. The joining of aluminum and aluminum alloys to copper is widely used in the power, chemical, refrigeration, transportation and aerospace industries. [0003] There are currently many problems in the connection of aluminum and aluminum alloys to copper. The thermal physical properties of aluminum and copper (melting point, linear expansion coefficient, thermal conductivity, heat of fusion) are very different, and there is a large thermal stress in the weld when direct welding, so the connection effect is very poor; the dire...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/19B23K35/28
Inventor 黄继华南水平陈树海赵兴科张华田景玉
Owner UNIV OF SCI & TECH BEIJING
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