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A kind of aluminum alloy diffusion bonding method of interface spraying aluminum powder auxiliary agent

A technology of diffusion joining and powder additives, used in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of high clamping pressure and high mold temperature, and achieve comprehensive performance improvement, dimensional accuracy improvement, and connection temperature reduction. Effect

Active Publication Date: 2021-03-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of high mold clamping pressure and high mold temperature during the existing aluminum alloy diffusion bonding, the present invention proposes an aluminum alloy diffusion bonding method by spraying aluminum powder additives on the interface

Method used

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  • A kind of aluminum alloy diffusion bonding method of interface spraying aluminum powder auxiliary agent
  • A kind of aluminum alloy diffusion bonding method of interface spraying aluminum powder auxiliary agent

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specific Embodiment approach 1

[0019] Specific Embodiment 1: In this embodiment, the aluminum alloy diffusion bonding method of spraying aluminum powder additives on the interface is characterized in that: the method is carried out according to the following steps:

[0020] 1. Degreasing and descaling of aluminum alloy parts;

[0021] 2. Spray the peelable glue on the surface of the aluminum alloy parts to be diffused 2 to 4 times, then fix the peeling plate on the surface of the aluminum alloy parts to be diffused, remove the peelable glue in the solder resist area exposed on the peeling plate, and then remove Peel off the rigid plate, spray the release agent solution on the solder mask area, and finally remove the remaining peelable glue;

[0022] 3. Coating epoxy resin glue on the surface of the diffusion connection area of ​​the aluminum alloy parts;

[0023] 4. Spray aluminum powder additives on the surface of epoxy resin glue within 5 to 30 minutes after the epoxy resin glue coating in step 3 is comp...

specific Embodiment approach 2

[0030] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the degreasing and descaling of the aluminum alloy parts described in step 1 are completed by ultrasonic pickling; the pickling solution used is hydrofluoric acid, nitric acid and For the mixed solution of water, the mass fraction of hydrofluoric acid in the mixed solution is 8%-10%, the mass fraction of nitric acid is 24%-30%, and water is the balance. Other steps and parameters are the same as those in the first embodiment.

[0031] Compared with the traditional pickling process, when the surface oxide scale is removed by ultrasonic pickling, the vibration of the ultrasonic wave can more effectively remove the dense oxide film on the aluminum alloy surface.

specific Embodiment approach 3

[0032] Embodiment 3: This embodiment differs from Embodiment 2 in that: the ultrasonic pickling time is 2 to 3 minutes. Other steps and parameters are the same as those in the first embodiment.

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Abstract

The invention relates to an aluminum alloy diffusion connection method, in particular to an aluminum alloy diffusion connection method for spraying an aluminum powder additive on interfaces. The method aims to solve the problems of high die clamping pressure and high die temperature during aluminum alloy diffusion connection. According to the method disclosed by the invention, the aluminum powderadditive is coated between the diffusion interfaces, under the action of pressure, aluminum powder can relatively slide between the two interfaces and has certain plastic deformation at the same time,so that aluminum powder particles are embedded into an aluminum alloy, and on one hand, the addition of the aluminum powder additive can damage an oxide film of the diffusion connection interfaces, increase the contact area of the diffusion interfaces, and realize the diffusion connection under lower pressure and lower temperature. According to the method disclosed by the invention, the service performance of diffusion-connected components is not influenced, the die clamping pressure of the diffusion connection is low and the die temperature is low. The method is suitable for aluminum alloy diffusion connection.

Description

technical field [0001] The invention relates to an aluminum alloy diffusion bonding method. Background technique [0002] In recent years, new energy vehicles have developed rapidly, and electric vehicles have gradually occupied the automotive market. The mailboxes of traditional fuel vehicles have also been replaced by battery boxes for new energy vehicles. The battery pack plays an extremely important role as the power source of electric vehicles. The aluminum alloy battery tray is water-cooled As the load-bearing component of the car battery, the plate has a high research value. It is a large-scale hollow aluminum alloy complex structure with a water cooling system. The existing technology is to weld the upper and lower plates together by welding. The process of this connection method Complex, and the reliability of the connection is not high due to the existence of stress after welding. The existing aluminum alloy superplastic forming / diffusion connection combination pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/02B23K20/233B23K20/24B23K20/16
CPCB23K20/02B23K20/16B23K20/2336B23K20/24
Inventor 卢振蒋少松陈啸张广东
Owner HARBIN INST OF TECH
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