Preparation method of foamed aluminum reinforced by synergism of carbon nano tubes and alumina particles

A technology of alumina particles and carbon nanotubes, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of difficulty in uniform dispersion, limited improvement of composite foam strength, limited addition of carbon tubes, etc. High energy absorption shock absorption effect, uniform cell size effect

Inactive Publication Date: 2019-02-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large aspect ratio of CNTs, it is difficult to achieve uniform dispersion, and the amount of carbon tubes added is limited, and the strength of composite foam is also limited.

Method used

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  • Preparation method of foamed aluminum reinforced by synergism of carbon nano tubes and alumina particles
  • Preparation method of foamed aluminum reinforced by synergism of carbon nano tubes and alumina particles
  • Preparation method of foamed aluminum reinforced by synergism of carbon nano tubes and alumina particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation method of the composite foam reinforced by carbon nanotubes and alumina particles in this embodiment includes the following steps: (1) Adding alumina powder and cobalt nitrate hexahydrate to about 150 ml of absolute ethanol at a mass ratio of 20:1 . Ultrasound is used to accelerate the dissolution of cobalt nitrate, and then continue stirring in a water bath at 60°C until the ethanol is completely volatilized. The obtained mixture was dried in an oven at 80°C for 8 hours. The obtained dry 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 turn off the hydrogen, heat up to 600°C under the protection of argon, and pass in the mixture of acetylene and argon at a ratio of 1:12, react at 600°C for 60 minutes, and finally turn off the mixture. Cool down to room temperature under the protection of air to obtain a compos...

Embodiment 2

[0029] The preparation method of the composite foam reinforced by carbon nanotubes and alumina particles in this embodiment includes the following steps: (1) Adding alumina powder and cobalt nitrate hexahydrate to about 150 ml of absolute ethanol at a mass ratio of 40:1 . Ultrasound is used to accelerate the dissolution of cobalt nitrate, and then continue stirring in a water bath at 60°C until the ethanol is completely volatilized. The obtained mixture was dried in an oven at 80°C for 8 hours. The obtained completely dried powder tube furnace was heated 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, heat up to 600°C under the protection of argon, and introduce the mixture of acetylene and argon at a ratio of 1:12, react at 600°C for 30 minutes, and finally turn off the mixture. Cool down to room temperature under the protection of air to obtain a comp...

Embodiment 3

[0035] The preparation method of the composite foam reinforced by carbon nanotubes and alumina particles in this embodiment includes the following steps: (1) Add alumina powder and cobalt nitrate hexahydrate into about 150 ml of absolute ethanol at a mass ratio of 30:1 . Ultrasound is used to accelerate the dissolution of cobalt nitrate, and then continue stirring in a water bath at 60°C until the ethanol is completely volatilized. The obtained mixture was dried in an oven at 80°C for 8 hours. The obtained dry powder is 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, heat up to 600°C under the protection of argon, and pass in the mixture of acetylene and argon at a ratio of 1:12, react at 600°C for 60 minutes, and finally turn off the mixture. Cool down to room temperature under the protection of air to obtain a composit...

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Abstract

The invention relates to a preparation method of foamed aluminum reinforced by synergism of carbon nano tubes and alumina particles. The preparation method comprises the steps of dissolving aluminum oxide powder and cobalt-nitrate hexahydrate according to the mass ratio being 20 to 40:1 into absolute ethyl alcohol, continuously stirring in water-bath heating until ethyl alcohol is volatilized completely, drying an obtained mixture in a drying oven, putting obtained completely dried powder into a tube furnace, rising the temperature to 250 DEG C under the protection of argon, switching to the hydrogen atmosphere, and preserving heat at 250 DEG C and 450 DEG C; then closing hydrogen, rising the temperature to 600 DEG C under the protection of argon, feeding mixed gas of acetylene and the argon according to the proportion of the acetylene and the argon being 1:12, reacting at 600 DEG C, finally closing the mixed gas, cooling to the room temperature under the protection of the argon, and obtaining composite powder with the carbon nano tubes uniformly loaded on the surfaces of the alumina particles; ball milling; uniformly mixing ball-milled powder and urea; removing the urea, and drying; and sintering.

Description

Technical field [0001] The invention belongs to the technical field of composite foam aluminum preparation, and relates to synergistic reinforcement of carbon nanotubes and alumina particles grown in situ, thereby realizing the preparation of high-strength composite foam. Background technique [0002] As a typical structural and functional integrated material, foam aluminum material has the advantages of light weight, high specific strength, energy absorption, shock resistance, damping, sound insulation and heat insulation, electromagnetic shielding, etc., and is widely used in aerospace, automotive Industry and other fields. Due to its special porous structure, foamed aluminum material exhibits different stress-strain curves of the solid material during compression. The literature shows that foam aluminum materials are generally divided into three stages in the compression process: the first is the elastic deformation stage, the foam aluminum material undergoes elastic deformat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C21/00C22C32/00
CPCC22C21/00C22C26/00C22C32/00B22F3/1121B22F2998/10C22C2026/002B22F1/10B22F3/02B22F2009/043
Inventor 赵乃勤许佳丽杨旭东何春年师春生沙军威
Owner TIANJIN UNIV
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