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

A technology of carbon nanotubes and composite reinforcement, which is applied in the field of magnesium-based alloys manufactured by casting, can solve the problems of limited application range of composite materials, obvious dislocation strengthening effect, and poor performance control ability, so as to avoid the occurrence of tissue defects and adjust Wide range, avoid the effect of floating and segregation

Inactive Publication Date: 2011-10-05
HEBEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

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Embodiment 1

[0031] The first step, preparation of carbon nanotube-alumina composite reinforcement phase

[0032]According to the ratio of ferric nitrate nonahydrate: aluminum oxide=0.07:1 by mass ratio, the required amount of ferric nitrate nonahydrate and 200 mesh alumina particles are weighed and added to deionized water to prepare a molar concentration of 0.01mol / L ferric nitrate aqueous solution with alumina particles in it, put the system in a container and then put it into an electric constant temperature drying oven at 60°C to dehydrate until viscous, put the viscous into a quartz boat, Then place the quartz boat in the constant temperature zone of the tube furnace, and feed nitrogen into the tube furnace at a flow rate of 60ml / min, then raise the temperature of the tube furnace to 400°C and calcinate for 0.5h to obtain the calcined product iron oxide / alumina, then close the nitrogen, feed hydrogen into the tube furnace at a flow rate of 60ml / min and keep it for 0.5h, reduce the c...

Embodiment 2

[0036] Except that the magnesium alloy substrate was used instead of the pure magnesium substrate, other steps and processes were the same as in Example 1, thereby preparing the same carbon nanotube-alumina composite reinforced magnesium matrix composite material.

Embodiment 3

[0038] The first step, preparation of carbon nanotube-alumina composite reinforcement phase

[0039] According to the mass ratio of ferric nitrate nonahydrate: aluminum oxide=0.50:1, weigh the required amount of ferric nitrate nonahydrate and 300 mesh alumina particles and add it to deionized water to prepare a molar concentration of 0.05mol / L ferric nitrate aqueous solution with alumina particles in it, put the system in a container and then put it into an electric heating constant temperature drying oven at 75 ℃ to dehydrate until viscous, put the viscous into a quartz boat, Then place the quartz boat in the constant temperature zone of the tube furnace, and feed nitrogen into the tube furnace at a flow rate of 90ml / min, then raise the temperature of the tube furnace to 450°C and calcinate for 1h to obtain the calcined product iron oxide / Aluminum oxide, then close the nitrogen, feed hydrogen into the tube furnace at a flow rate of 90ml / min and keep it for 1h, reduce the cal...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C47/08C22C49/04C22C101/10C22C101/04
Inventor 李海鹏张坤宇王洪水范佳薇夏兴川
Owner HEBEI UNIV OF TECH
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