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Preparation method of carbon nano-tube reinforced foamed aluminum filled aluminum alloy pipe composite structure

A technology of aluminum alloy tubes and carbon nanotubes, which is applied in the field of filling structure preparation, can solve problems such as difficulty in achieving uniform dispersion, CNTs agglomeration, and CNTs structure damage, and achieve enhanced shock absorption and energy absorption effects, uniform pore size and pore diameter Precise control, high energy absorption and shock absorption effect

Inactive Publication Date: 2019-01-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large aspect ratio of CNTs, CNTs are easily agglomerated in the aluminum matrix, making it difficult to achieve uniform dispersion.
The commonly used dispersion methods will cause serious damage to the structure of CNTs.

Method used

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  • Preparation method of carbon nano-tube reinforced foamed aluminum filled aluminum alloy pipe composite structure
  • Preparation method of carbon nano-tube reinforced foamed aluminum filled aluminum alloy pipe composite structure
  • Preparation method of carbon nano-tube reinforced foamed aluminum filled aluminum alloy pipe composite structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of the open-cell CNTs / Al composite foam in this example includes the following steps: (1) adding aluminum powder and cobalt nitrate hexahydrate into absolute ethanol whose mass is 7 times that of aluminum powder according to the mass ratio of 40:1 . Ultrasound was used to accelerate the dissolution of cobalt nitrate, and then stirring was continued in a water bath at 60°C until ethanol evaporated completely. The obtained mixture was dried in an oven at 80° C. for 8 hours. The obtained completely dried powder was placed in a tube furnace, heated to 250°C under the protection of argon, switched to hydrogen with a flow rate of 200ml / min, and kept at 250°C and 450°C for 1 hour respectively. Then close the hydrogen, raise the temperature to 600°C under the protection of argon, and pass the mixed gas of acetylene and argon in the ratio of 1:12, react at 600°C for 30m minutes, finally close the mixed gas, Cool to room temperature under the protection o...

Embodiment 2

[0034]The preparation method of the open-cell CNTs / Al composite foam in this example includes the following steps: (1) adding aluminum powder and cobalt nitrate hexahydrate to absolute ethanol whose mass is 10 times that of aluminum powder according to the mass ratio of 80:1 . Ultrasound was used to accelerate the dissolution of cobalt nitrate, and then stirring was continued in a water bath at 60°C until ethanol evaporated completely. The obtained mixture was dried in an oven at 80° C. for 8 hours. In the obtained completely dried powder tube furnace, the temperature was raised to 250°C under the protection of argon, switched to hydrogen with a flow rate of 250ml / min, and kept at 250°C and 450°C for 1 hour respectively. Then turn off the hydrogen, raise the temperature to 600°C under the protection of argon, and pass the mixed gas of acetylene and argon in the ratio of 1:12, react at 600°C for 60m minutes, finally turn off the mixed gas, and in argon Cool to room temperatur...

Embodiment 3

[0041] The preparation method of the open-cell CNTs / Al composite foam in this example includes the following steps: (1) adding aluminum powder and cobalt nitrate hexahydrate to absolute ethanol whose mass is 8 times that of aluminum powder according to the mass ratio of 120:1 . Ultrasound was used to accelerate the dissolution of cobalt nitrate, and then stirring was continued in a water bath at 60°C until ethanol evaporated completely. The obtained mixture was dried in an oven at 80° C. for 8 hours. The obtained dried powder was placed in a tube furnace, heated to 250°C under the protection of argon, switched to hydrogen with a flow rate of 240ml / min, and kept at 250°C and 450°C for 1 hour respectively. Then turn off the hydrogen, raise the temperature to 600°C under the protection of argon, and pass the mixed gas of acetylene and argon in the ratio of 1:12, react at 600°C for 60m minutes, finally turn off the mixed gas, and in argon Cool to room temperature under the prote...

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Abstract

The invention relates to a preparation method of a carbon nano-tube reinforced foamed aluminum filled aluminum alloy pipe composite structure. The preparation method is implemented through the following steps of preparing composite powder uniformly loaded with carbon nano-tubes on the surface of aluminum powder; conducting mechanical ball milling; evenly mixing the ball-milled composite powder with urea and then conducting cold press molding; conducting water bathing on a cold pressed sample under 60-80 DEG C for 6-8 h to remove urea and then putting the sample in a drying oven to be dried after water bathing; putting the dried sample in a tube furnace to be heated to 650 DEG C under argon shielding of 200-300 ml / min at the rate of 5 DEG C / min, conducting sintering for 2-4 h, and then conducting furnace cooling to the indoor temperature after completion of sintering to obtain the carbon nano-tube reinforced foamed aluminum filled aluminum alloy pipe composite structure.

Description

technical field [0001] The invention belongs to the technical field of preparation of foamed aluminum-filled composite structures, and relates to the use of in-situ grown carbon nanotubes as a reinforcing phase, and the use of composite foam materials as core materials to fill metal tubes to achieve synergistic reinforcement, thereby achieving high strength and high energy absorption. Preparation of filled structures. Background technique [0002] As a representative of structural-functional integration materials, aluminum foam has been gradually applied in various fields such as aerospace and rail transportation in recent years due to its excellent properties such as abundant matrix element reserves, low density, good damping performance, and strong energy absorption capacity. However, when aluminum foam is used alone, it can withstand a small load, and the defect of easy instability and collapse greatly limits its application. The thin-walled tube structure has a stable a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/11C22C21/00
CPCB22F3/1125C22C21/00C22C2026/002
Inventor 赵乃勤许佳丽马有草杨旭东何春年师春生
Owner TIANJIN UNIV
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