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A method for improving the mechanical properties of carbon nanotube-reinforced magnesium-based composites

A technology of carbon nanotubes and composite materials, which is applied in the field of metal matrix composite material preparation, can solve the problems of insignificant improvement of mechanical properties of reinforced magnesium matrix composite materials, and achieves the advantages of solving poor interface bonding, improving interface bonding strength and simple preparation process. Effect

Active Publication Date: 2018-10-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical purpose of the present invention is to provide a simple and effective treatment method to improve the mechanical properties of the composite materials for the problem that the mechanical properties of the current carbon nanotube-reinforced magnesium-based composite materials are not significantly improved.

Method used

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  • A method for improving the mechanical properties of carbon nanotube-reinforced magnesium-based composites
  • A method for improving the mechanical properties of carbon nanotube-reinforced magnesium-based composites
  • A method for improving the mechanical properties of carbon nanotube-reinforced magnesium-based composites

Examples

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Effect test

Embodiment example 1

[0018] The process for improving the mechanical properties of carbon nanotube-reinforced Mg-Al composite materials prepared in this embodiment is carried out in the following steps. The prepared carbon nanotube-reinforced AZ91 containing 1.0wt.% CNTs (composition is 9.02wt.% Al, 0.65wt.% Zn, 0.22wt.% Mn, 0.05wt.% Si, the balance being Mg) the composite material block is put into heat treatment furnace, feeds the mixed gas of argon and hydrogen to protect (the proportion of hydrogen is : 0vol.%) protective gas, first set the heating rate to 10K / min to 500°C, then adjust the heating rate to 5K / min to 630°C, after holding for 5 hours, cool to room temperature with the furnace, and the performance is significantly improved Carbon nanotube-reinforced AZ91 composites.

Embodiment example 2

[0020] The process for improving the mechanical properties of carbon nanotube-reinforced pure magnesium-based composite materials prepared in this embodiment is carried out according to the following steps. The nickel-coated carbon nanotube-reinforced pure magnesium containing 0.1wt.% and 0.3wt.% CNTs respectively prepared The composite material blocks are put into the heat treatment furnace respectively, and the mixed protective gas of argon and hydrogen is introduced (the proportion of hydrogen is: 25vol.%). After h, take it out and cool it to room temperature in the air to obtain a carbon nanotube reinforced pure magnesium composite material with improved mechanical properties.

Embodiment example 3

[0022] The process for improving the mechanical properties of carbon nanotube-reinforced Mg-Al composite materials prepared in this embodiment is carried out in the following steps. The obtained carbon nanotube-reinforced AZ31 containing 5.0wt.% CNTs (composition is 3.10wt.% Al, 1.10wt.% Zn, 0.30wt.% Mn, 0.01wt.% Si, the balance is Mg) composite material blocks are put into heat treatment furnace, pass into the mixed protection gas of pure argon and hydrogen (the proportion that hydrogen occupies is : 10vol.%) protective gas, set the heating rate to 10K / min and raise the temperature to 500°C, after 120 hours of heat preservation, take it out and put it in water to quench to room temperature, and obtain the carbon nanotube reinforced AZ31 composite material with improved mechanical properties.

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Abstract

The invention relates to a method for improving the mechanical property of a carbon nanotube reinforced magnesium matrix composite and belongs to the technical field of preparation of metal matrix composite materials. The method comprises the steps that a prepared carbon nanotube reinforced matrix composite material is subjected to heat treatment, protective gas is introduced, the carbon nanotube reinforced matrix composite material is heated to 450 DEG C to 630 DEG C, the temperature is kept for 0.5 h to 120 h, then cooling with a furnace or air cooling or water quenching is conducted, and therefore the carbon nanotube reinforced magnesium matrix composite material of which the mechanical property is remarkably improved is prepared. The preparation method has the beneficial effects that the process is simple and convenient to implement and the environmental pollution is small, the problem that the interference bonding of a carbon nanotube in the magnesium matrix composite is weak can be solved effectively, and the mechanical property of the composite material can be improved remarkably.

Description

Technical field: [0001] The invention relates to a method for improving the mechanical properties of a carbon nanotube-reinforced magnesium-based composite material, and belongs to the technical field of metal-based composite material preparation. Background technique [0002] Since Japanese scientists discovered carbon nanotubes (CNTs), due to their extremely high aspect ratio, Young's modulus and shear modulus, carbon nanotubes have high specific strength and specific stiffness, and at the same time they have Very high tensile strength and modulus of elasticity, extremely small density and good chemical stability, very suitable as a reinforcing phase of metal matrix composites to prepare carbon nanotube-reinforced metal matrix composites. [0003] Adding carbon nanotubes with excellent properties to the magnesium matrix metal material can improve the tensile strength and elongation of the magnesium matrix alloy, but carbon nanotubes have a very large specific surface area ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06C22F1/02
CPCC22F1/002C22F1/02C22F1/06
Inventor 杜文博韩国强王朝辉刘轲李淑波杜宪
Owner BEIJING UNIV OF TECH
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