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A method for preparing graphene-aluminum alloy composite material by electro-explosive spraying

A composite material and aluminum alloy technology, which is applied in the field of graphene-aluminum alloy composite materials prepared by electric explosion spraying, can solve the problems of poor wettability between graphene and matrix alloy, reduced graphene performance, and few graphene composite materials, etc., to achieve The effect of high product quality, reduced production cost and high production efficiency

Active Publication Date: 2019-03-22
深圳特新界面科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are several major problems in the preparation process of graphene and metal composites: one is the poor wettability of graphene and the matrix alloy, how to solve the interface problem; the other is the addition of nanoscale graphene reinforcement particles, how to solve the dispersion uniformity
However, this solution requires a liquid phase environment, which causes impurities on the surface of graphene and reduces the performance of graphene.
[0007] At present, there is a technology for preparing graphene by electric explosion method, but there are relatively few technologies for preparing graphene composite materials by electric explosion method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Sonicate flake graphite powder in HF solution with a solution concentration of 5% for 1 minute to remove impurities on the graphite surface, and finally rinse with deionized water to remove HF residual liquid. The purity is 99.9% at ambient pressure of 1000 Pa and 80°C. % of the graphite powder is dried under the protection of argon, and after removing impurities, it is dried under the protection of argon for later use;

[0029] (2) Put the graphite powder material into the ball mill, set the temperature of the ball mill to 60°C, and the grinding speed to 320rpm / min. After grinding, the finer solid product is graphite fine powder;

[0030] (3) The ultra-fine graphite powder is atomized with a high-pressure airflow, the nozzle pressure of the high-pressure airflow is 8MPa, and the outlet flow rate is 24.4m / s, and it is sprayed between the two preset electrodes. 20 A alternating current, the alternating electric field between the two electrodes has a voltage of 5KV, a...

Embodiment 2

[0033] (1) Sonicate pyrolytic graphite powder in HF solution with a solution concentration of 3.5% for 0.5 minutes to remove impurities on the surface of pyrolytic graphite, and finally rinse with deionized water to remove HF residual liquid. The pyrolysis graphite powder with a purity of 99.9% is dried under the protection of argon gas, and after removing impurities, it is dried under the protection of argon gas for use;

[0034] (2) Put the graphite powder material into the sand mill, set the temperature of the sand mill to 150°C, and the grinding speed to 350rpm / min. After grinding, a finer solid product is graphite fine powder;

[0035] (3) Atomize the ultra-fine graphite powder with a high-pressure airflow, the nozzle pressure of the high-pressure airflow is 9MPa, the outlet flow rate is 21m / s, and an alternating current of 10A is provided between the two electrodes. The alternating electric field between them has a voltage of 1.5KV and an alternating frequency of 1000Hz....

Embodiment 3

[0038] (1) Sonicate graphite oxide powder in HF solution with a solution concentration of 4.5% for 0.7 minutes to remove impurities on the surface of graphite oxide, and finally rinse with deionized water to remove residual HF liquid. At an ambient pressure of 500 Pa, the purity is Dry the graphite powder under the protection of 99.9% argon gas. After removing impurities, dry it under the protection of argon gas for later use;

[0039] (2) Put the graphite powder material into the co-rotating screw extruder, set the temperature of the co-rotating screw extruder to 250°C, and the extrusion speed to 450 rpm / min, and obtain a finer solid product after grinding Graphite fine powder;

[0040] (3) The ultra-fine graphite powder is atomized with a high-pressure airflow, the nozzle pressure of the high-pressure airflow is 12MPa, the outlet flow rate is 24.4 m / s, and an alternating current of 15 A is provided between the two electrodes. The alternating electric field between them has ...

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Abstract

The invention provides a method for preparing a graphene-aluminum alloy composite through electric explosion spray. The method comprises the steps that an aluminum alloy is connected to an electrode; graphite powder is sprayed to the electrode at the high pressure, so that continuous discharge occurs due to a pulse large current, the aluminum alloy is exploded, and high-temperature and high-pressure molten particles are formed instantly; meanwhile, graphite is disaggregated into graphene, and the graphene and the aluminum alloy are dispersed under the effect of high-pressure impact waves and cooled quickly, so that the superfine graphene-aluminum alloy composite which is superfine and high in bonding strength is formed. By means of the method, the graphene can be directly dispersed into the aluminum alloy under the condition that the aluminum alloy does not need to be molten completely; in addition, the graphene in the obtained aluminum alloy is high in dispersibility; and the obtained graphene-aluminum alloy composite has the beneficial effects of being small in weight, high in strength and high in modulus and plays an important role in the fields of aviation and aerospace of the military industry, lightweight cars and sport equipment. Development of graphene industrialization can be further promoted.

Description

technical field [0001] The invention relates to the field of graphene composite materials, in particular to a method for preparing graphene-aluminum alloy composite materials by electric explosion spraying. Background technique [0002] Graphene is the strongest substance known to man. Graphene is a monoatomic layer of graphite film, and its lattice is a two-dimensional honeycomb structure composed of carbon atoms. This material has many novel physical properties. It is currently known as the best conductive material at room temperature. The speed of electrons in it reaches 1 / 300 of the speed of light, far exceeding that of ordinary conductors. In addition, graphene, as an advanced reinforcement material, brings huge development space for the development of new high-performance metals. Graphene composite metal materials have the characteristics of light weight, high strength, and high modulus, and play an important role in the aerospace field of military industry, light ve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/14B33Y70/00
CPCB22F9/14B33Y70/00
Inventor 陈庆王镭迪曾军堂
Owner 深圳特新界面科技有限公司
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