Ultrasonic assistance based connecting method for light alloy and thermoplastic composite

Abstract

The invention relates to an ultrasonic assistance based connecting method for a light alloy and a thermoplastic composite. The method comprises the following specific methods that (1) before connecting, the surface of the to-be-connected light alloy is subjected to mechanical treatment or electrochemical treatment; (2) a to-be-connected part is placed on a workbench, the light alloy is adopted asan upper plate, the thermoplastic composite is adopted as a lower plate, a carbon nano tube enhanced thermoplastic composite film the same as the material of the lower plate is selected as a middle layer, and a clamp is used for fixing; (3) an ultrasonic system is placed at the bottom of a connecting area, and ultrasonic amplitude transformers are evenly distributed at the bottom of the lower plate; (4) a heating block is placed on the surface of the upper plate to achieve heating; (5) after heating is carried out to the set temperature, an ultrasonic vibration system is started; and (6) afterthe light alloy and the thermoplastic composite are rapidly connected, the connecting portion is cooled in a segmented cooling manner. Efficient connecting of the light alloy and the thermoplastic composite can be achieved, the mechanical interlocking capacity of a joint can be increased, the residual stress of the joint can be reduced, and wide applicability is achieved.

Description

technical field [0001] The invention belongs to the technical field of connecting metals and composite materials, and in particular relates to a method for connecting light alloys and thermoplastic composite materials based on ultrasonic assistance. Background technique [0002] Lightweight alloys and composite materials have the characteristics of low density, high specific strength and good corrosion resistance, and have been widely used in the aerospace field. However, due to the large difference in thermophysical properties between lightweight alloys and composite materials, the connection between the two is a difficult point. At present, the connection between light alloy and composite material mainly includes adhesive bonding, mechanical connection and welding. [0003] Chinese patent (publication number: CN201810455288.X, publication time: September 18, 2018) discloses a connection structure and connection method between carbon fiber composite materials and dissimila...

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Problems solved by technology

However, due to the large difference between the thermophysical properties of light alloys and composite materials, the connection between the two is a difficult point

[0003] Chinese patent (publication number: CN201810455288.X, publication time: September 18, 2018) discloses a connection structure and connection method between carbon fiber composite materials and dissimilar materials. The surface quality of the connecting parts is high and takes a long time

[0004] Chinese patent (publication number: CN201720288983.2, publication time: February 23, 2018) discloses a rivetless riveting device between dissimilar materials based on the principle of hot melt, but this connection will cause fibers in the composite material The structure is damaged, and the holes in the joint will generate a large stress concentration, which has a great impact on the performance of the joint

[0005] Chinese patent (publication number: CN108857069A, publication time: August 14, 2018) discloses a method for welding carbon fiber composite materials and copper alloys, but the laser arc composite heat source requires a relatively high temperature in the welding process to weld the metal Melts, but the composite material degrades at this temperature, causing porosity defects in the weld due to insufficient material

[0006] Chinese patent (publication number: CN201611218090.7, publication time: May 31, 2017) discloses a solder and its application method in welding C / SiC composite materials and metals, but the brazing process requires overall heating, It will change the microstructure of the base metal, and at the same time, some elements in the solder will react with the base metal to produce some unnecessary intermetallic compounds, which will become the weak link in the joint

[0007] Chinese patent (publication number: CN106113484A, publication time: November 16, 2016) discloses a connection method between thermoplastic composite materials and metals. Electromagnetic heating is currently only applicable to the connection between thermoplastic composite materials and metals, and this method uses Due to the lack of upsetting in the connection between metal and composite materials, it is difficult to make the interface tightly bonded; in addition, the temperature in welding is difficult to control accurately

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