A kind of high damping carbon nanotube/aluminum alloy composite material and preparation method thereof

A carbon nanotube and composite material technology is applied in the field of powder metallurgy preparation of high damping carbon nanotube/aluminum alloy composite materials, which can solve the problem of changing the tensile strength and corrosion resistance of the alloy matrix, reducing the comprehensive performance of the material, and the interface bonding plasticity. To achieve the effect of easy preparation, good tensile strength, simple and flexible process

Active Publication Date: 2017-02-22
CRRC QINGDAO SIFANG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the main problems of the powder metallurgy preparation method of high-damping carbon nanotubes / aluminum alloy composites are: (1) During high-temperature sintering and densification, the interface reaction between carbon nanotubes and aluminum alloy matrix is ​​serious, and the reaction product Al 4 C 3 This results in poor interfacial bonding plasticity and a decrease in the overall performance of the material; (2) the modification of carbon nanotubes can avoid the interface reaction between carbon nanotubes and aluminum alloys to a certain extent, but it will affect the composition of the alloy phase and change the Tensile Strength and Corrosion Resistance of Alloy Matrix

Method used

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  • A kind of high damping carbon nanotube/aluminum alloy composite material and preparation method thereof
  • A kind of high damping carbon nanotube/aluminum alloy composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0043] (1) The carbon nanotubes with a diameter of 5-50nm and a length of 1-20μm are mixed with aluminum alloy powder with a thickness of 0.1-2μm, a sheet diameter of 5-500μm, and a diameter-to-thickness ratio greater than 10 in a volume ratio of 2:98 Press evenly into a blank;

[0044] (2) Put the billet into the sintering furnace and vacuum until the pressure in the sintering furnace is less than 2×10 -2 Pa, after the sintering furnace is heated to 614°C at a heating rate of 5°C / min, keep it at 614°C for 20 minutes;

[0045] (3) Pour argon gas into the sintering furnace, make the pressure of argon gas in the sintering furnace 0.1MPa, control the temperature of the sintering furnace at 15°C / min and reduce the temperature drop rate to 527°C, continue to keep the temperature at 527°C for 180min, control After cooling down to 430°C at a cooling rate of 15°C / min, control the cooling rate to 2°C / min to cool to room temperature to obtain a carbon nanotube / aluminum alloy sintered compact...

Embodiment 2

[0050] (1) The carbon nanotubes with a diameter of 10-40nm and a length of 5-20μm are mixed with aluminum alloy powder with a thickness of 0.1-2μm, a sheet diameter of 5-500μm, and a diameter-to-thickness ratio greater than 10 in a volume ratio of 10:90. Press evenly into a blank;

[0051] (2) Put the billet into the sintering furnace and vacuum until the pressure in the sintering furnace is less than 2×10 -2 Pa. After the sintering furnace is heated to 614°C at a heating rate of 2°C / min, it is kept at 614°C for 5 minutes, and the temperature is lowered to 590°C at a rate of 10°C / min, and the temperature is kept for 25 minutes;

[0052] (3) Pour argon gas into the sintering furnace, make the pressure of argon gas in the sintering furnace 0.1MPa, control the temperature of the sintering furnace at 5℃ / min and reduce the temperature drop rate to 527℃, keep the temperature at 527℃ for 180min, control After cooling down to 380°C at a cooling rate of 15°C / min, control the cooling rate to...

Embodiment 3

[0057] (1) The carbon nanotubes with a diameter of 20-30nm and a length of 10-15μm are mixed with aluminum alloy powder with a thickness of 0.1-2μm, a sheet diameter of 5-500μm, and a diameter-to-thickness ratio greater than 10 in a volume ratio of 0.5:99.5 Press evenly into a blank;

[0058] (2) Put the billet into the sintering furnace and vacuum until the pressure in the sintering furnace is less than 2×10 -2 Pa. After the sintering furnace is heated to 614°C at a heating rate of 2°C / min, it is kept at 614°C for 15 minutes, and the temperature is reduced to 558°C at a rate of 10°C / min, and then heated to 590°C at a rate of 5°C / min , Continue to keep warm for 5 min;

[0059] (3) Pour argon gas into the sintering furnace, make the pressure of argon gas in the sintering furnace 0.1MPa, control the temperature of the sintering furnace at 5℃ / min and reduce the temperature drop to 500℃, keep the temperature at 500℃ for 300min, control After cooling down to 420°C at a cooling rate of ...

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Abstract

The invention provides a high-damping carbon nanotube / aluminum alloy composite material. The carbon nanotubes are uniformly distributed in an aluminum alloy matrix, the outer surface of the carbon nanotubes is coated with a diffusion layer, the diffusion layer extends from the outer surface of the carbon nanotubes to the aluminum alloy matrix; the diffusion layer has a microstructure different from the aluminum alloy matrix, and a micro surface is formed between the diffusion layer and the aluminum alloy matrix; and the damping factor of the high-damping carbon nanotube / aluminum alloy composite material is 0.005-0.0011. According to the high-damping carbon nanotube / aluminum alloy composite material prepared by the invention, because the diffusion layer is formed outside the carbon nanotubes, the interfacial potential between the carbon nanotubes and the alloy matrix can be obviously reduced, and interface bonding is coordinated and intensified. Therefore, the prepared composite material has ideal plasticity and damping properties, and the like.

Description

Technical field [0001] The invention relates to a high-performance aluminum alloy composite material, in particular to a powder metallurgical preparation method of a high-damping carbon nanotube / aluminum alloy composite material. Background technique [0002] With the rapid development of high-speed train technology, its upgrades have higher and higher requirements for the performance of materials. The application of lightweight, high tensile strength, high modulus, high plasticity, and high damping materials can not only effectively reduce the weight of the train, but also Increasing the speed of the train can also ensure the safety and comfort of the train. However, the tensile strength and modulus of aluminum alloy materials (6N01, 7N01, etc.) currently in service for high-speed trains can no longer meet the requirements of high-speed trains for further reducing body weight and increasing speed. New types of high tensile strength, high modulus, high plasticity, The developmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C1/05C22F1/04
CPCC22C1/0416C22C1/05C22C21/00
Inventor 李志强邓小军刘韶庆谭占秋范根莲李斌张荻孙召进郭建强
Owner CRRC QINGDAO SIFANG CO LTD
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