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Method for industrially preparing graphene coated aluminum nanopowders

A nano-aluminum powder, graphene technology, applied in metal processing equipment, transportation and packaging, etc., can solve problems such as no solution, achieve the effect of simple modification method, prevent oxidation, and solve surface oxidation

Active Publication Date: 2015-09-23
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, for the above problems, there is no ideal solution

Method used

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  • Method for industrially preparing graphene coated aluminum nanopowders
  • Method for industrially preparing graphene coated aluminum nanopowders
  • Method for industrially preparing graphene coated aluminum nanopowders

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The present embodiment provides a kind of method of graphene coating nano-aluminum powder, and this method comprises the following steps:

[0042] (1) Preparation and dissolution of graphene

[0043] Graphene is prepared by the traditional Hummers method, which specifically includes the following steps:

[0044] Install the round-bottomed reaction bottle in an ice-water bath, add an appropriate amount of concentrated sulfuric acid, and add a mixture of 4g graphite powder and 2g sodium nitrate under stirring;

[0045] Add 15g of potassium permanganate in portions, stir quickly and control the reaction temperature not to exceed 20°C, raise the temperature to about 35°C, continue to stir for 30min, then slowly add an appropriate amount of deionized water, after stirring for 20min, add an appropriate amount of hydrogen peroxide to reduce the residual oxidant, Turn the solution into bright yellow;

[0046] Filtrate while hot, and be that the HCl solution of 5wt% and deioni...

Embodiment 2

[0057] The present embodiment provides a kind of method of graphene coating nano-aluminum powder, and this method comprises the following steps:

[0058] (1) Preparation and dissolution of graphene

[0059] Graphene adopts traditional Hummers method to prepare, and concrete method is with embodiment 1;

[0060] Then 5mg of graphene was added into polyacrylic acid aqueous solution (200mL) and stirred rapidly (500r / min) to prepare a graphene dispersion, and it was vacuumized to remove dissolved air in the liquid.

[0061] (2) Graphene-coated nano-aluminum powder

[0062] In the glove box, add 20 mg of nano-aluminum powder at a rate of 2 mg / min to the prepared 100 mL graphene dispersion, and stir rapidly (2000 r / min) to form a crude product, and vacuumize it to remove dissolved air in the liquid , wherein the nano-aluminum powder needs to be treated with dilute hydrochloric acid or sodium hydroxide before adding the graphene mixture to ensure the complete removal of the passiva...

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Abstract

The invention provides a method for industrially preparing graphene coated aluminum nanopowders. The method comprises the steps of dissolving graphene in an organic solvent to prepare graphene dispersion liquid; treating the graphene dispersion liquid by vacuum pumping until the vacuum degree exceeds 10<-2>Pa, wherein the weight of graphene is 1 to 99% of the total weight of the graphene dispersion liquid; adding aluminum nanopowders to the graphene dispersion liquid treated by vacuum pumping under inert atmosphere; agitating at the speed of 600 to 3000rpm for 30 to 100 minutes; treating by vacuum pumping until the vacuum degree exceeds 10<-2>Pa so as to obtain a rough product, wherein the weight of the aluminum nanopowders is 1 to 99% of the total weight of the rough product; thermally treating the rough product at high temperature of water so as to coat the aluminum nanopowders with the grahene. With the adoption of the method, the formation of an aluminum oxide passive film on the surface of the aluminum nanopowders can be effectively inhibited; the problem that the surfaces of the aluminum nanopowders are easily oxidized can be solved.

Description

technical field [0001] The invention relates to a method for applying graphene-coated nano-aluminum powder to improve the anti-oxidation ability of the nano-aluminum powder, which belongs to the technical field of anti-corrosion. Background technique [0002] Today, nano-aluminum powder has been widely used in aerospace, chemical industry, metallurgy (aluminothermic metallurgy, steelmaking deoxidizer), shipbuilding (conductive coating), refractory materials (magnesia carbon bricks for steelmaking furnaces), new building materials, anti-corrosion materials and other fields . However, since the surface of nano-aluminum powder is very easy to form a passivation film of aluminum oxide in the air, its performance in composite materials is greatly reduced. Therefore, how to effectively suppress the formation of aluminum oxide passivation film on the surface of nano-aluminum powder is the key to the large-scale application research of nano-aluminum powder. [0003] However, for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/06B22F9/24B22F1/02B22F1/16
CPCB22F9/06B22F9/24B22F1/16
Inventor 张利强李永峰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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