Preparation method for crystal whisker carbon nano tubes coated with aluminum oxide/magnesium matrix composite semi-solid billets

A technology of coating alumina and carbon nanotubes, which is applied in the field of material preparation, to achieve the effect of improving the interface, reducing agglomeration, and reducing the probability of agglomeration

Active Publication Date: 2017-02-01
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In order to overcome the technical difficulties in the preparation and molding of traditional carbon nanotube composite materials, the present invention intends to provide a new preparation technology for semi-solid blanks of CNT magnesium-based materials

Method used

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  • Preparation method for crystal whisker carbon nano tubes coated with aluminum oxide/magnesium matrix composite semi-solid billets

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Experimental program
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Effect test

Embodiment 1

[0033]Whiskered 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 dried in a vacuum oven for later use. Using aluminum nitrate and the above-mentioned dried whisker carbon nanotubes as raw materials, add methanol solution to ultrasonic for 40 minutes; wherein the molar ratio of carbon nanotubes, aluminum nitrate and methanol is 1:0.4:182 to obtain whisker carbon nanotube suspension ; This suspension is imported in the hydrothermal reactor, wherein the volume of the suspension accounts for 25% of the volume of the reactor. Then put it into the reaction furnace to heat, raise the temperature to 100°C at 5°C / min, keep it for 1h, then raise the temperature to 150°C at 3°C / min, keep it for 8h; cool it to room temperature at 5°C / min, filter and dry at low temperature Put it into a corundum crucible and bake at a high temperature ...

Embodiment 2

[0036] Whiskered 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 dried in a vacuum oven for later use. Using aluminum nitrate and the above-mentioned dried whisker carbon nanotubes as raw materials, add them into methanol solution and sonicate for 40 minutes; wherein the molar ratio of whisker carbon nanotubes, aluminum nitrate and methanol is 1:0.7:182, and the suspension of whisker carbon nanotubes is obtained. Turbid liquid; import the suspension into the hydrothermal reaction kettle, wherein the volume of the suspension accounts for 30% of the volume of the reaction kettle. Then put it into the reaction furnace to heat, raise the temperature to 120°C at 3°C / min, keep it for 1h, then raise the temperature to 150°C at 1°C / min, keep it for 10h; cool it to room temperature at 7°C / min, filter and dry at low temperature Put...

Embodiment 3

[0039] Whiskered 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 dried in a vacuum oven for later use. Using aluminum nitrate and the above-mentioned dried whisker carbon nanotubes as raw materials, add them into a methanol solution and sonicate for 60 minutes; wherein the molar ratio of whisker carbon nanotubes, aluminum nitrate and methanol is 1:1:182, and the suspension of whisker carbon nanotubes is 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 120°C at 3°C / min, keep it for 1h, then raise the temperature to 150°C at 1°C / min, keep it for 12h; cool it to room temperature at 10°C / min, filter and dry at low temperature Pu...

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Abstract

The invention discloses a preparation method for crystal whisker carbon nano tubes coated with aluminum oxide/magnesium matrix composite semi-solid billets. The method includes the steps that the crystal whisker carbon nano tubes coated with magnesium oxide are prepared firstly, magnesium alloy powder and crystal whisker carbon nano tube materials coated with the magnesium oxide are guided into a ball-milling crucible, and ball-milling is carried out on the condition of argon shielding; mixed powder is placed into the crucible and heated to be lower than the solid phase line by 10-20 DEG C through a muffle furnace, and the temperature is preserved for 1-2 hours; then the mixed powder is shifted into an ultrasonic magnetic stirring furnace for being continuously heated, the solid rate of the mixed powder is controlled to be within a certain range, the mixed powder is stirred and dispersed at low speed under the synergistic effect of ultrasound and magnetic equipment, argon gas is guided into the ultrasonic magnetic stirring furnace for shielding, and the stirring time is controlled; and obtained slurry is poured into corresponding dies for being cooled to obtain the semi-solid billets. The method has the advantages of being simple, safe, low in cost, easy to operate and controllable.

Description

technical field [0001] The invention belongs to the technical field of material preparation. Background technique [0002] Composite reinforcement of magnesium alloys with fibers or particles, the prepared magnesium-based composites have attracted great attention due to their high specific strength, good electrical and thermal conductivity and low thermal expansion coefficient, and have been widely used in aerospace and automobile manufacturing , Electronic instruments and other fields. However, the properties of the composite materials prepared by the two reinforcement methods largely depend on the properties of the reinforcement phase itself, its distribution and the wettability with the matrix. [0003] Carbon nanotubes are tubular objects rolled from graphite hexagonal networks. They have a unique nano-hollow structure, closed topological configuration and helical structure, and thus have a large number of special excellent properties, such as high strength, high elasti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C49/04C22C49/14C22C47/04C22C101/10
CPCC22C47/04C22C49/04C22C49/14
Inventor 闫洪吴庆捷
Owner NANCHANG UNIV
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