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A method of preparing a high-performance graphene reinforced aluminium-based composite material

A technology for strengthening aluminum-based and composite materials, applied in the field of materials science, can solve the problems of poor graphene dispersion and interface reactions, and achieve the effects of avoiding agglomeration, improving microhardness, and making significant technological progress.

Active Publication Date: 2017-04-19
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

[0005] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for preparing high-performance graphene-reinforced aluminum-based composite materials, and the method for preparing high-performance graphene-reinforced aluminum-based composite materials should solve the existing problems During the preparation of graphene-reinforced aluminum matrix composites in the technology, graphene has poor dispersion and is prone to interfacial reactions with aluminum.

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  • A method of preparing a high-performance graphene reinforced aluminium-based composite material
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  • A method of preparing a high-performance graphene reinforced aluminium-based composite material

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Embodiment 1

[0019] (1) Preparation of graphene oxide and surface modification of aluminum powder

[0020] The preparation method of graphene oxide: 1. adopt high-purity graphite 5 g, 2.5 gNaNO 3 , added to a certain amount of H 2 SO 4 solution, stir evenly, 2. Then gradually add a certain amount of KMnO 4 , stir evenly for about 1 hour; 3. Add 200 ml of water, stir at 100°C for 1 hour, 4, add a small amount of H 2 o 2 and HCl solution. Then, graphene oxides of different sizes were centrifuged to obtain a graphene oxide solution with basically the same size (with a size between 10 μm and 20 μm).

[0021] Aluminum powder surface modification method: use planetary ball mill to mill aluminum powder, firstly at low speed of 150~200 rpm, ball mill for 0.5~1 h, then at high speed of about 350~400 rpm, time of 2~4 h, so that the spherical particle aluminum powder becomes Flaky aluminum powder (microscopic morphology of aluminum powder before and after ball milling, see figure 1 ).

[0022...

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Abstract

A method of preparing a graphene reinforced aluminium-based composite material is provided. The method includes a step of preparing graphene oxide; a step of performing surface modification on aluminum powder to prepare flake-like aluminum powder; a step of preparing graphene / aluminium hydroxide / aluminum multilayer clad structured powder, namely a step of mixing graphene and the aluminum powder, then adding the mixture into an alcohol solution, and performing ultrasonic treatment for 0.1-1 h at 30-50 DEG C to obtain the graphene / aluminium hydroxide / aluminum multilayer clad structured powder; and a step of adding the prepared graphene / aluminium hydroxide / aluminum multilayer clad structured powder into a hot pressing sintering mold, applying a pressure of 100-200 MPa, protecting the powder with argon or nitrogen and performing hot pressing sintering to obtain the high-performance graphene reinforced aluminium-based composite material. The method effectively avoids graphene agglomeration and interface reactions between the graphene and aluminum. The microhardness of the composite material prepared by the method is increased by 30% or above.

Description

technical field [0001] The invention belongs to the field of materials science, and relates to an aluminum-based composite material, in particular to a method for preparing a high-performance graphene-reinforced aluminum-based composite material. Background technique [0002] Due to its low density and stable performance, aluminum matrix composites are widely used in aerospace and high-end automobile manufacturing fields. Compared with traditional reinforcements (ceramic particles, carbon fibers, carbon nanotubes, etc.), graphene has the advantages of low density, high mechanical properties, good thermal conductivity, and low thermal expansion coefficient. Graphene has been considered as a very Promising Augmentation Body. The successful development of high-performance graphene-reinforced aluminum matrix composites can not only improve the performance of composite materials, but also reduce the density of composite materials. [0003] In terms of the preparation methods of...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C1/04
CPCC22C1/0416C22C1/10
Inventor 詹科赵斌方文仟吴一昊严雅
Owner UNIV OF SHANGHAI FOR SCI & TECH
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