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A kind of aluminum alloy surface activated connection method

A technology of aluminum alloy surface and connection method, which is applied in metal material coating process, vacuum evaporation plating, coating, etc., can solve the problems of high pressure and vacuum, reduce the performance of brazed joints, and take a long time to achieve The middle layer is dense, the adverse effects are eliminated, and the performance is good

Active Publication Date: 2019-05-14
HARBIN INST OF TECH AT WEIHAI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the application of aluminum alloy flux can bring the following problems: (1) in the brazing process, the reaction of flux and oxide film may produce defects such as bubbles, which will reduce the performance of brazed joints; (2) aluminum alloy flux itself and The residue is highly corrosive, and if it is not cleaned in time after brazing, it will cause corrosive damage to the brazed joint; (3) The reactive flux will produce irritating and corrosive fumes when used, so the brazing process Ventilation is required in
Diffusion bonding of aluminum alloy uses pressure to produce plastic deformation on the microscopic contact surface to destroy the oxide film, so as to achieve the purpose of removing the oxide film and forming a good connection joint, but this connection method requires relatively high pressure and vacuum degree and takes a long time

Method used

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  • A kind of aluminum alloy surface activated connection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The steps of an aluminum alloy surface activated connection method are as follows:

[0026] 1) Grind two pieces of 1060 aluminum alloys with dimensions of 10mm×20mm×5mm and 5mm×5mm×5mm in turn with 600#, 800#, 1200#, 1500#, 2000# metallographic sandpaper, and then use 10% NaOH Solution, 10%HNO 3 The solution was chemically cleaned for 10-15s, then rinsed with deionized water, and finally cleaned with absolute ethanol and acetone for 15 minutes with ultrasonic waves and dried;

[0027] 2) Put the 1060 aluminum alloy sample into the magnetron sputtering equipment, and draw the vacuum to 5×10 -3 After Pa, pure Ar (purity 99.99%) was introduced, and the pure Si target was pre-sputtered for 10 minutes. Before the Si film was deposited by magnetron sputtering, a negative high voltage was provided to the substrate through a pulse bias power supply, and the self-luminescence of the substrate surface was utilized. Plasma generated by photodischarge cleans the surface of the s...

Embodiment 2

[0031] The steps of an aluminum alloy surface activated connection method are as follows:

[0032] 1) Grind two pieces of 7075 aluminum alloys with dimensions of 10mm×20mm×5mm and 5mm×5mm×5mm in turn with 600#, 800#, 1200#, 1500#, 2000# metallographic sandpaper, and then use 10% NaOH Solution, 10%HNO 3 The solution was chemically cleaned for 10-15s, then rinsed with deionized water, and finally cleaned with absolute ethanol and acetone for 15 minutes with ultrasonic waves and dried;

[0033] 2) Put the 7075 aluminum alloy sample into the magnetron sputtering equipment, and draw the vacuum to 5×10 -3 After Pa, pure Ar (purity 99.99%) was introduced, and the pure Cu target was pre-sputtered for 10 minutes. Before the Cu film was deposited by magnetron sputtering, a negative high voltage was provided to the substrate through a pulse bias power supply, and the self-luminescence of the substrate surface was utilized. Plasma generated by photodischarge cleans the surface of the s...

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Abstract

The invention provides a surface activation connection method of aluminum alloy, that is: firstly, pretreat the surface of aluminum alloy to remove oxide film and impurities, then use magnetron sputtering technology to activate the surface of aluminum alloy and deposit an intermediate layer, and In the protected state, the aluminum alloy sample assembly is heated to the connection temperature and held for a certain period of time, and the eutectic liquid phase is formed by the eutectic reaction between the intermediate layer and the aluminum alloy to achieve the connection of the aluminum alloy, and then the eutectic liquid is solidified at the same temperature to obtain the microstructure The aluminum alloy connecting joint with good performance, the invention combines the magnetron sputtering technology and the instantaneous liquid phase diffusion connection, realizes the activation of the aluminum alloy surface, effectively removes the oxide film on the aluminum alloy surface and hinders the formation of a new oxide film, and eliminates the oxide film The adverse effect on the connection of aluminum alloys relies on the generation of eutectic liquid phase to achieve the metallurgical combination of aluminum alloys, and finally obtains aluminum alloy connection joints with good structure and performance.

Description

technical field [0001] The invention relates to a metal surface treatment method, in particular to an aluminum alloy surface activation connection method. Background technique [0002] We know that aluminum alloy has the advantages of high specific strength, low density, good corrosion resistance, good electrical conductivity and thermal conductivity, and is widely used in aerospace, shipbuilding, automobile and other industrial fields. In order to ensure efficiency and meet lightweight requirements, it is of great significance to replace other metals and alloys with lightweight aluminum alloys as structural parts, and the connection technology of aluminum alloys plays a pivotal role as a key link. A layer of dense and stable oxide film, the existence of the oxide film hinders the connection of aluminum alloys, especially in the process of brazing and diffusion welding of aluminum alloys, the oxide film will hinder the wetting and spreading of the molten solder, and hinder t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/35C23C14/58C23C14/16
CPCC23C14/16C23C14/35C23C14/5806
Inventor 宋晓国牛超楠刘海建彭赫力赵一璇曹建李中权
Owner HARBIN INST OF TECH AT WEIHAI
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