Preparation method of carbon nanotube-alumina composite reinforced magnesium-based composite material

Abstract

The invention discloses a preparation method of a carbon nanotube-alumina composite reinforced magnesium-based composite material, which relates to the manufacture of magnesium-based alloy by using a casting method. The preparation method comprises the steps of: step 1, calcining and reducing raw materials of ferric nitrate nonahydrate and alumina in the ratio of (0.07-1.00):1 to obtain an iron / alumina composite catalyst, and finally, performing catalytic pyrolysis reaction by using the mixed gas of nitrogen gas and ethylene in the volume ratio of (6-12):1 for uniformly dispersing carbon nanotubes on the surface of the alumina, so as to prepare a carbon nanotube-alumina composite reinforced phase; and step 2, adding the carbon nanotube-alumina composite reinforced phase to a molten magnesium base material, and stirring and casting to prepare the carbon nanotube-alumina composite reinforced magnesium-based composite material, wherein the added carbon nanotube-alumina composite reinforced phase accounts for 1-15% of the molten magnesium base material by mass percentage. According to the invention, the defect of a magnesium-based alloy texture in the magnesium-based composite material produced in the prior art is overcome, the excellent enhancing effect of the carbon nanotubes in a magnesium matrix can be brought into full play, and the comprehensive performance of the magnesium-based composite material is ensured to be enhanced.

Description

technical field [0001] The technical solution of the invention relates to the production of magnesium-based alloys by casting method, specifically the preparation method of carbon nanotube-alumina composite reinforced magnesium-based composite materials. Background technique [0002] As the lightest metal structural material, magnesium alloy has many characteristics such as high specific strength and specific stiffness, strong electrical and thermal conductivity, excellent casting performance, good machining performance, and easy recycling. It is known as the green structural material of the 21st century. , has broad application prospects in high-tech fields such as aerospace, automobiles, electronics, communications and machinery. However, with the development of modern industry, the requirements for magnesium alloys are getting higher and higher, and the traditional magnesium alloys have gradually exposed their shortcomings in terms of physical properties and mechanical pr...

AI Technical Summary

Problems solved by technology

The range of the addition amount of the reinforcement phase in this patent is narrow, and due to the limitation of avoiding the difficulty of dispersing the carbon nanotubes, it is impossible to achieve a higher content of the addition amount of the reinforcement phase

This patented method uses commercially available common carbon nanotubes, which are restricted by the sales market and cannot flexibly adjust the length, structure, and type of carbon nanotubes according to needs.

In addition, the patent uses a single carbon nanotube reinforcement phase, and its dislocation strengthening effect in the magnesium matrix has no other large-scale reinforcement phases (such as SiC, Al 2 o 3 etc.) Dislocation strengthening effect is obvious

To sum up, this patent has limited reinforcement effect on magnesium-based composite materials, and poor ability to control its performance, which makes the application range of composite materials limited.

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