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A preparation method of multi-walled carbon nanotubes reinforced magnesium-based composites coated with simple copper

A technology of multi-wall carbon nanotubes and composite materials, which is applied in the field of material preparation and forming, can solve the problems of weakening the dispersion effect of carbon nanotubes, and achieve the effects of simple and effective operation difficulty, avoiding agglomeration, and low reaction temperature

Active Publication Date: 2018-02-23
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method uses thixotropy as an innovation, under this method, in order to achieve the fluidity effect, the degree of melting of the magnesium alloy powder is relatively high, and the problem of agglomeration of the reinforcement phase similar to that of casting will still occur, so that the carbon generated during the powder mixing process Nanotube dispersion effect weakened

Method used

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  • A preparation method of multi-walled carbon nanotubes reinforced magnesium-based composites coated with simple copper

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Experimental program
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Effect test

Embodiment 1

[0029] Multi-walled carbon nanotubes were ultrasonically pre-dispersed in pure nitric acid solution for 8 hours at 60°C. After cooling to room temperature, they were washed with deionized water, centrifuged until neutral, and then dried in a vacuum oven for later use. With copper nitrate and the carbon nanotubes of above-mentioned oven dry as raw material, add in the ethanol solution ultrasonic 40min; Wherein carbon nanotube, copper nitrate and ethanol molar ratio are 1:0.4:127, obtain multi-walled carbon nanotube suspension; The suspension is introduced into the hydrothermal reaction kettle, wherein the volume of the suspension accounts for 25% of the volume of the reaction kettle. Then put it into the reaction furnace to heat, raise the temperature to 200°C at 5°C / s, keep it for 1h, and then raise the temperature to 270°C at 5°C / s, keep it for 8h; take it out, air cool, filter and dry, and get coated elemental copper Multi-walled carbon nanotube materials.

[0030] Put the ...

Embodiment 2

[0032]Multi-walled carbon nanotubes were ultrasonically pre-dispersed in pure nitric acid solution for 8 hours at 60°C. After cooling to room temperature, they were washed with deionized water, centrifuged until neutral, and then dried in a vacuum oven for later use. Using copper nitrate and the above-mentioned dried carbon nanotubes as raw materials, add them to the ethanol solution and sonicate for 40 minutes; wherein the molar ratio of multi-walled carbon nanotubes, copper nitrate and ethanol is 1:0.7:127 to obtain a suspension of multi-walled carbon nanotubes ; This suspension is imported in the hydrothermal reactor, wherein the volume of the suspension accounts for 30% of the volume of the reactor. Then put it into the reaction furnace to heat, raise the temperature to 200°C at 5°C / s, keep it for 1h, and then raise the temperature to 280°C at 5°C / s, keep it for 10h; take it out, air cool, filter and dry, and get coated with simple copper Multi-walled carbon nanotube mater...

Embodiment 3

[0035] Multi-walled carbon nanotubes were ultrasonically pre-dispersed in pure nitric acid solution for 8 hours at 60°C. After cooling to room temperature, they were washed with deionized water, centrifuged until neutral, and then dried in a vacuum oven for later use. Using copper nitrate and the above-mentioned dried multi-walled carbon nanotubes as raw materials, they were added into an ethanol solution and ultrasonicated for 60 minutes; wherein the molar ratio of multi-walled carbon nanotubes, copper nitrate and ethanol was 1:1:127, and the suspension of multi-walled carbon nanotubes was obtained. Turbid liquid; import the suspension into the hydrothermal reaction kettle, wherein the volume of the suspension accounts for 40% of the volume of the reaction kettle. Then put it into the reaction furnace to heat, raise the temperature to 200°C at 5°C / s, keep it for 1h, and then raise the temperature to 300°C at 5°C / s, keep it for 12h; take it out, air cool, filter and dry, and ge...

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Abstract

The invention discloses a preparation method for a multi-wall carbon nano tube reinforced magnesium-based composite material coated with elemental copper. The preparation method comprises the following steps of: firstly, preparing a multi-wall carbon nano tube coated with elemental copper; then, introducing multi-wall carbon nano tube magnesium alloy powder into material suspension coated with elemental copper to mix to obtain a mixture, vacuum-drying the mixture at a temperature being 50-100 DEG C, introducing the mixture into a ball-milling crucible, and ball-milling the mixture under protection of argon gas; cold-pressing the mixture into a prefabricated block under pressure of 50-150 MPa, putting the prefabricated block into a mould, heating the mould to a temperature being 10-30 DEG C lower than a solid phase line at a heating rate being 10-15 DEG C / min, continuously heating at a heating rate being 3-6 DEG C / min, and controlling a solidification phase rate of the mould to be within a range of 70-90%, thereby obtaining the multi-wall carbon nano tube reinforced magnesium-based composite material coated with elemental copper. The preparation method has the advantages of being simple, safe, low in cost, easy to operate, controllable, and the like.

Description

technical field [0001] The invention belongs to the technical field of material preparation and shaping. Background technique [0002] As a metal-based structural material, magnesium-based composites have the characteristics of light weight, high specific strength and specific stiffness, good electrical and thermal conductivity, damping performance, and excellent casting performance, making them more important in metal-based composites. potential application prospects. However, magnesium alloys also have disadvantages such as small elastic modulus, low strength, high thermal expansion coefficient, poor dimensional stability at high temperature, and poor wear resistance, which make magnesium alloys have great limitations as structural materials. It is difficult to meet the demand for high-strength structural materials. [0003] In recent years, the composite reinforcement of magnesium alloys by fibers or particles has attracted great attention and has been widely used in ae...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C47/14C22C47/04C22C49/04C22C49/14C22C101/10C22C121/02
CPCC22C47/04C22C47/14C22C49/04C22C49/14
Inventor 闫洪吴庆捷陈小会
Owner NANCHANG UNIV
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