A kind of aluminum alloy surface activated connection method

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...

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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

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