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A powder metallurgy preparation method of carbon nanotube reinforced aluminum alloy composite material

A technology of carbon nanotubes and composite materials, which is applied in the field of metal matrix composite materials, can solve the problems of easy hydrolysis and difficult dispersion, and achieve the effect of small structural damage, good compatibility and avoiding damage

Active Publication Date: 2016-06-01
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention avoids the problems of difficulty in dispersing and easy hydrolysis involved in the uniform dispersion of carbon nanotubes directly in aluminum alloy powder, and is conducive to maximizing the composite strengthening and alloy strengthening effects of carbon nanotubes, saves energy and time, and is safe and easy to implement

Method used

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  • A powder metallurgy preparation method of carbon nanotube reinforced aluminum alloy composite material
  • A powder metallurgy preparation method of carbon nanotube reinforced aluminum alloy composite material
  • A powder metallurgy preparation method of carbon nanotube reinforced aluminum alloy composite material

Examples

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Effect test

Embodiment 1

[0038]Carbon nanotube reinforced 7055 aluminum alloy (containing carbon nanotube 1wt.%)

[0039] Take 50g of pure aluminum powder with a particle size of 10 μm in a stirring ball mill, use absolute alcohol as a solvent, add 2g of titanate as a ball milling process control agent, use stainless steel balls as a ball milling medium, and the ball-to-material ratio is 20:1. Ball mill at a speed of 100 rpm for 6 hours, filter and dry to obtain flake-shaped aluminum powder, with a diameter of about 60 μm, a thickness of about 200 nm, and an aspect ratio of about 300.

[0040] 1 g of carboxylated carbon nanotubes was ultrasonically dispersed to prepare a carbon nanotube water slurry. Add 50 g of flake aluminum powder into the polyvinyl alcohol solution and stir for 30 minutes, and filter to remove excess polyvinyl alcohol solution. Add flake aluminum powder into diluted carbon nanotube water slurry (concentration: 0.3g / L), stir until the slurry is clear, filter and dry to obtain carb...

Embodiment 2

[0052] Carbon nanotube reinforced 2014 aluminum alloy (containing carbon nanotube 2wt.%)

[0053] Take 50g of pure aluminum powder with a particle size of 10 μm in a stirring ball mill, use absolute alcohol as a solvent, add 2g of titanate as a ball milling process control agent, use stainless steel balls as a ball milling medium, and the ball-to-material ratio is 20:1. Ball mill at a speed of 100 rpm for 8 hours, filter and dry to obtain flake-shaped aluminum powder, with a diameter of about 60 μm, a thickness of about 100 nm, and an aspect ratio of about 600.

[0054] 2 g of carboxylated carbon nanotubes were ultrasonically dispersed to prepare a carbon nanotube water slurry. Add 50 g of flake aluminum powder into the polyvinyl alcohol solution and stir for 30 minutes, and filter to remove excess polyvinyl alcohol solution. Add flake aluminum powder into diluted carbon nanotube water slurry (concentration: 0.3g / L), stir until the slurry is clear, filter and dry to obtain ca...

Embodiment 3

[0059] Carbon nanotube reinforced 5083 alloy (containing 2wt% carbon nanotubes)

[0060] Prepare the flake-shaped pure aluminum powder according to the scheme of Case 1, then add the flake-shaped aluminum powder into the mixed solution of polyethylene glycol and ferric nitrate and stir for 1 h, filter and dry in vacuum, and heat to 600°C in a vacuum tube furnace under an argon atmosphere. °C, keep warm for 3 hours and then cool down to obtain 4wt% carbon nanotube / pure aluminum flake composite powder.

[0061] Put 50g of spherical 5083 aluminum alloy powder with a particle size of 30 μm in a stirring ball mill, use absolute alcohol as a solvent, add 2g of titanate as a ball milling process control agent, use stainless steel balls as a ball milling medium, and the ball-to-material ratio is 20:1. The flake 5083 aluminum alloy powder was obtained after ball milling at 100 rpm for 6 hours, suction filtration and drying.

[0062] Mix the above 50g carbon nanotube / pure aluminum comp...

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Abstract

The invention provides a powder metallurgy preparation method of a carbon nanotube reinforced aluminium alloy composite material. According to the powder metallurgy preparation method, slurry mixing method or in-suit growth method is adopted for pre-preparation of carbon nanotube / pure aluminium flaky composite powder; the carbon nanotube / pure aluminium flaky composite powder is mixed with aluminium alloy powder according to a certain ratio; an obtained mixture is subjected to densifying, sintering, thermal deformation processing and heat treatment so as to obtain the carbon nanotube reinforced aluminium alloy composite material. The powder metallurgy preparation method is capable of solving problems that dispersion of carbon nanotube in aluminium alloy powder is difficult to realize, and hydrolysis is easily caused, so that it is beneficial for preparation of the carbon nanotube / aluminium alloy composite material with high strength, high modulus, and high plasticity.

Description

technical field [0001] The invention relates to the technical field of metal matrix composite materials, in particular to a powder metallurgy preparation method of carbon nanotube reinforced aluminum alloy composite materials. Background technique [0002] Due to the characteristics of low density, high strength and good plasticity, aluminum alloy is widely used in high-tech fields such as national economy, aerospace, national defense and military industry. As countries around the world pay more and more attention to energy saving, emission reduction and environmental pollution, higher requirements are put forward for the mechanical properties of aluminum alloys, not only high strength, but also higher modulus. Although conventional alloying can greatly increase the strength, it cannot improve the modulus. Compounding is currently the most important way to solve the problem of low modulus of aluminum alloys. Among them, carbon nanotubes are ideal reinforcements for aluminu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C47/14C22C49/06C22C49/14C22C101/10C22C121/00
Inventor 范根莲李志强谭占秋魏辉张荻
Owner SHANGHAI JIAOTONG UNIV
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