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Powder metallurgy preparation method of carbon nanotube reinforced aluminium 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 difficult dispersion and easy hydrolysis, and achieve the effect of small structural damage, good compatibility and avoiding damage

Active Publication Date: 2014-07-09
SHANGHAI JIAO TONG 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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  • Powder metallurgy preparation method of carbon nanotube reinforced aluminium alloy composite material
  • Powder metallurgy preparation method of carbon nanotube reinforced aluminium alloy composite material
  • Powder metallurgy preparation method of carbon nanotube reinforced aluminium alloy composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0039] Take 50g of pure aluminum powder with a particle size of 10μm and place it in a stirring ball mill, use anhydrous alcohol as the solvent, add 2g of titanate as the ball milling process control agent, and use stainless steel balls as the ball milling medium. The ball-to-battery ratio is 20:1. Ball milled at a speed of 100 revolutions / min for 6 hours, filtered and dried to obtain flake aluminum powder with a flake diameter of about 60 μm, a flake thickness of about 200 nm, and a diameter-to-thickness ratio of about 300.

[0040] 1g of carboxylated carbon nanotubes is ultrasonically dispersed to prepare an aqueous carbon nanotube slurry. Add 50 g of flaky aluminum powder to the polyvinyl alcohol solution and stir for 30 minutes, and filter to remove excess polyvinyl alcohol solution. Add the flake aluminum powder to the diluted carbon nanotube water slurry (concentration of 0.3g / L), ...

Embodiment 2

[0052] Carbon nanotubes reinforced 2014 aluminum alloy (2wt.% of carbon nanotubes)

[0053] Take 50g of pure aluminum powder with a particle size of 10μm and place it in a stirring ball mill, use anhydrous alcohol as the solvent, add 2g of titanate as the ball milling process control agent, and use stainless steel balls as the ball milling medium. The ball-to-battery ratio is 20:1. Ball milled at a speed of 100 revolutions / min for 8 hours, filtered and dried to obtain flake aluminum powder with a flake diameter of about 60 μm, a flake thickness of about 100 nm, and a diameter-to-thickness ratio of about 600.

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

Embodiment 3

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

[0060] Prepare flaky pure aluminum powder according to the scheme of Case 1, then add the flaky aluminum powder to the mixed solution of polyethylene glycol and ferric nitrate and stir for 1 hour, filter and vacuum dry, and heat to 600 in a vacuum tube furnace under argon atmosphere. After keeping the temperature at ℃ for 3h, the temperature is lowered to obtain 4wt% carbon nanotube / pure aluminum flake composite powder.

[0061] Put 50g of spherical 5083 aluminum alloy powder with a particle size of 30μm in a stirred ball mill, use anhydrous alcohol as solvent, add 2g of titanate as ball milling process control agent, use stainless steel ball as ball milling medium, and the ratio of ball to material is 20:1. Ball milled at 100 revolutions / min for 6 hours, filtered and dried to obtain flake 5083 aluminum alloy powder.

[0062] Mix the above 50g carbon nanotube / pure aluminum composite powder with 50g flak...

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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-based 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 conservation, emission reduction, and environmental pollution, higher requirements are placed on the mechanical properties of aluminum alloys, not only requiring high strength but also higher modulus. Although conventional alloying can greatly increase the strength, it cannot increase the modulus. Compounding is currently the most important way to solve the problem of low modulus of aluminum alloy. Among them, carbon nanotubes are ideal reinforcements for al...

Claims

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Application Information

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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 JIAO TONG UNIV
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