Graphene-reinforced magnesium-aluminium matrix composite material and preparation method thereof

An aluminum-based composite material and graphene technology, which is applied in the field of graphene-reinforced magnesium, aluminum-based composite materials and their preparation, can solve the problems of increasing difficulty in removing impurities, unfavorable graphene self-dispersion, poor agglomeration, and the like, and achieves good results. The effect of interface combination, environmental friendliness, and simple preparation process

Active Publication Date: 2016-06-01
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are mainly the following problems: (1) The agglomeration of graphene will be worse under high temperature environment, which is not conducive to the self-dispersion of graphene; (2) Compared with graphene oxide with structural defects, pure graphene with complete structure Graphene must have better mechanical properties. Therefore, from the perspective of the mechanical properties of the reinforcement itself, it is more advantageous to directly add graphene with good dispersion to the matrix; (3) In addition, in order to ensure the graphene itself The organic surfactant or treatment agent added for dispersion will have adverse effects on the environment on the one hand, and on the other hand will add difficulty to the later impurity removal process

Method used

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  • Graphene-reinforced magnesium-aluminium matrix composite material and preparation method thereof
  • Graphene-reinforced magnesium-aluminium matrix composite material and preparation method thereof
  • Graphene-reinforced magnesium-aluminium matrix composite material and preparation method thereof

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Effect test

Embodiment 1

[0023] The preparation technology of the graphene / pure magnesium-based composite material of the present embodiment is carried out in the following steps:

[0024] (1) 200mg of graphene (few layers, purity of 99.0wt.%) is placed in 500ml of absolute ethanol, ultrasonic power is 1000W, and the duration is 30min ultrasonic dispersion treatment to obtain uniformly dispersed graphite with a concentration of 0.4mg / ml Graphene ethanol solution; then, 100g pure magnesium particles (magnesium content is 99.7wt.%, particle size is 400 orders) are intermittently added to the above-mentioned graphene ethanol solution for 20 times, each time adding 5g pure magnesium particles, and adding Finally, the mixed solution needs to be ultrasonically stirred for 5 minutes, and the mechanical stirring speed is 300 rpm to obtain a graphene / pure magnesium particle mixed solution;

[0025] (2) Put the mixed solution obtained in step (1) in a water bath, stir and heat evenly at 30°C, remove the solvent...

Embodiment 2

[0028] The preparation technology of the graphene / magnesium alloy-based composite material of the present embodiment is carried out according to the following steps:

[0029] (1) 200mg of graphene (few layers and multi-layers are mixed by mass 1:1, the purity is 99.0wt.%) is placed in 1000ml of absolute ethanol, and ultrasonic power is 600W, and the duration is 15min for ultrasonic dispersion treatment to obtain Concentration 0.2mg / ml homogeneously dispersed graphene ethanol solution; Immediately, 200g magnesium alloy particles (its composition is 5.9wt.%Zn, 0.5wt.%Zr, surplus is Mg, particle size is 200 orders) is divided into 4 intervals Add to the above-mentioned graphene ethanol solution, add 50g of magnesium alloy particles each time, and after each addition, the mixed solution needs to be ultrasonically stirred for 10min, and the mechanical stirring speed is 1000rpm to obtain a graphene / magnesium alloy particle mixed solution;

[0030] (2) Put the mixed solution obtained...

Embodiment 3

[0033] The preparation process of the graphene / aluminum alloy matrix composite material of the present embodiment is carried out according to the following steps:

[0034] (1) 300mg graphene (multi-layer, purity is 99.0wt.%) is placed in 1000ml dehydrated alcohol, carry out the ultrasonic dispersion treatment that ultrasonic power is 300W, duration is 40min, obtains the graphite of concentration 0.3mg / ml uniform dispersion ethylene alcohol solution; immediately, 600g aluminum alloy particle (its composition is 1.1wt.%Mg, 0.62wt.%Si, 0.65wt.%Fe, 0.29wt.%Cu, 0.13wt.%Mn, 0.22wt.%Zn , 0.10wt.% Cr, 0.15wt.% Ti, the balance is Al, and particle size is 300 orders) divides 6 times and intermittently joins in the above-mentioned graphene ethanol solution, adds 100g aluminum alloy particle each time, and after each addition needs The mixed solution was ultrasonically stirred for 20 minutes, and the mechanical stirring speed was 1500 rpm to obtain a graphene / aluminum alloy particle mixed...

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Abstract

The invention discloses a graphene-reinforced magnesium-aluminium matrix composite material and a preparation method thereof, and belongs to the technical field of composite materials. The preparation method comprises the following steps: dissolving graphene in an appropriate amount of ethanol solution and ultrasonically dispersing, then intermittently adding a metal powder in the solution, and ultrasonically dispersing and mechanically stirring simultaneously to obtain graphene/metal particle mixed solution with high dispersibility; sequentially carrying out the operations of heating in a low-temperature water bath to remove a solvent, drying in vacuum to obtain a powder, and continuously manually grinding the powder under an inert atmosphere, on the mixed solution, so as to obtain a graphene/metal particle composite powder with uniform dispersion; and carrying out hot-pressing on the composite powder into blocks, carrying out hot extrusion, and finally obtaining the graphene/metal matrix composite material. The preparation process disclosed by the invention is simple, environment-friendly, and free from addition of a non-volatile organic dispersant; low-temperature inert protection is adopted during the process of preparing the composite powder, and high own dispersion of graphene and high dispersion thereof in a metal matrix are achieved while the structural integrity of a graphene reinforcement is kept; and the preparation method is suitable for preparing the high-performance graphene-reinforced metal matrix composite material.

Description

technical field [0001] The invention relates to a composite material and a preparation method thereof, in particular to a graphene-reinforced magnesium-aluminum matrix composite material and a preparation method thereof. Background technique [0002] Since the independent existence of graphene was discovered in 2004, due to its high Young's modulus (1TPa), fracture strength (125GPa), ultra-high thermal conductivity (5000Wm -1 K -1 ) and electron mobility (200000cm 2 v -1 the s -1 ), graphene, as a "rookie" in the carbon material family, has become one of the most promising materials at present. Graphene is considered to be an ideal metal matrix composite material reinforcement because of its unique thin-layer two-dimensional structure and excellent physical and mechanical properties. However, it is precisely because of the thickness of graphene at the nanometer level that the "tulle"-like two-dimensional sheet structure carbon is very easy to agglomerate with each other...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10C22C21/00C22C23/00
CPCC22C1/0408C22C1/0416C22C1/05C22C1/10C22C21/00C22C23/00
Inventor 杜宪王朝辉杜文博李淑波刘轲
Owner BEIJING UNIV OF TECH
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