Method for preparing novel magnesium-based composite by ultrasonic assisted mechanical mixing

Abstract

The invention provides a method for preparing a carbon-nanotube strengthened magnesium-based composite. According to the method, carbon nanotubes are evenly distributed in a magnesium matrix through aseries of technical processes, and the strengthened magnesium-based composite is obtained; and an alloy is composed of, by weight percentage, 8% of Al, 2% of Si, 0.75% of Sb, 0.5% of Ca, 1% of the carbon nanotubes and the balance Mg, and the raw materials comprise a pure magnesium ingot, an aluminum ingot, an antimony ingot, an Mg-10Al-27Ca master alloy, an Al-50Si master alloy, magnesium chips and the carbon nanotubes. The method comprises the specific implementation and processing steps of (1), pre-dispersion of the carbon nanotubes, (2), alloy melting and semisolid mixing and (3), ultrasonic dispersion. By the adoption of the technology, the problem of the bad wettability of the matrix and the composite is solved, the defects of micropores, shrinkage porosity and the like in the compositing process are overcome effectively, the alloy structure is refined, and the mechanical performance is improved.

Description

technical field [0001] The invention belongs to the field of magnesium alloys, and in particular relates to a method for preparing novel magnesium-based composite materials by ultrasonic-assisted mechanical stirring. Background technique [0002] Since entering the 21st century, resources and the environment have become the primary issues of human sustainable development. Therefore, the current trend of world industrial development is to save energy, resources and green production. As the lightest metal material for engineering structures, magnesium alloy has many excellent unique properties, such as high specific strength, high specific modulus, good electrical and thermal conductivity, good damping and shock absorption and electromagnetic shielding performance, easy to process and form, good Magnesium alloys have been widely used in automobiles, communication equipment, aviation and other fields due to their advantages such as regeneration and reuse. Therefore, magnesium ...

AI Technical Summary

Problems solved by technology

[0006] As we all know, the main obstacle restricting the application of carbon nanotube-reinforced composite materials is that it is difficult to uniformly disperse in the matrix material, because carbon nanotubes are easy to form larger agglomerations, the surface structure of carbon nanotubes is relatively complete, and there are fewer active groups, so in It is difficult to dissolve in various solvents. Because the surface of carbon nanotubes is not active, chemical reactions are not easy to occur, and the interface with the matrix alloy is relatively fragile and the combination is not firm.

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