Preparation method for whisker carbon nanotube-reinforced aluminum matrix composite coated with aluminum oxide

A technology of coating alumina and carbon nanotubes, which is applied in the field of material preparation and forming, can solve the problems of unfavorable performance improvement of composite materials, lack of preparation and forming technology of carbon nanotube-reinforced aluminum-based composite materials, and easy agglomeration of CNTs, etc., to achieve simple and effective Difficulty of operation, reducing the chance of reunion, avoiding the effect of reunion

Active Publication Date: 2017-02-15
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it can improve the compactness problem, CNTs are easy to agglomerate under rheological conditions, which is not good for the performance of composite materials.
[0012] Therefore, in summary, there is still a lack of a cost-effective carbon nanotube-reinforced aluminum matrix composites preparation and forming technology.

Method used

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  • Preparation method for whisker carbon nanotube-reinforced aluminum matrix composite coated with aluminum oxide
  • Preparation method for whisker carbon nanotube-reinforced aluminum matrix composite coated with aluminum oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 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 40 minutes; wherein the molar ratio of whisker carbon nanotubes, aluminum nitrate and methanol is 1:0.4:182, 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 25% of the volume of the reaction kettle. 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 Pu...

Embodiment 2

[0037] 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 1:0.7:182, to obtain whisker carbon nanotube suspension ; 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 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 it into a corundum crucible and bake at a high temperatu...

Embodiment 3

[0040] 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 provides a preparation method for a whisker carbon nanotube-reinforced aluminum matrix composite coated with aluminum oxide. The preparation method comprises the steps that a whisker carbon nanotube coated with aluminum oxide is prepared firstly, then aluminum alloy powder is guided into turbid liquid of the whisker carbon nanotube coated with the aluminum oxide, so that a mixture is obtained, the mixture is dried in a vacuum mode at the temperature of 50-100 DEG C and then guided into a ball-milling crucible so as to be ball-milled under argon protection; the mixture is cold-pressed into a prefabricated block under the pressure of 60-150 MPa; the prefabricated block is placed in a die, the die is heated at the heating rate of 5-10 DEG C/min till the temperature of the die is 10-20 DEG C below the solid phase line, then the die continues to be heated at the heating rate of 1-5 DEG C/min and the solid phase rate of the die is controlled to 70%-90%, and thus the multi-wall carbon nanotube-reinforced aluminum matrix composite coated with pure copper is obtained. 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] Aluminum alloy is the most widely used metal structural material in the industry. It has the characteristics of light weight, high specific strength, and good plasticity, and can be processed into various profiles. It has a wide range of applications and is widely used in aviation, aerospace, automobiles, ships and other industries. Today, with the rapid development of industrial economy, the demand for aluminum alloy parts is increasing, and people's performance requirements for aluminum alloys are also increasing. [0003] In recent years, the use of fibers or particles to strengthen magnesium alloys, the prepared aluminum matrix 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. , automobile ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C49/06C22C49/14C22C47/04C22C101/10C22C121/02
CPCC22C47/04C22C49/06C22C49/14
Inventor 闫洪吴庆捷
Owner NANCHANG UNIV
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