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Method for preparing graphene-aluminum matrix composite based on aluminum powder in-situ reduction and microwave hot pressing sintering

An aluminum matrix composite material, hot pressing sintering technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc. The effect of complete layer structure and high comprehensive performance

Inactive Publication Date: 2019-11-05
徐州宇帆机电科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, no substantial progress has been made in the research on graphene-reinforced aluminum matrix composites, mainly because graphene is easily agglomerated in aluminum-based metals due to its large specific surface area, and it is difficult to uniformly disperse in aluminum-based composites. , the second is that the process is relatively complicated, the requirements for equipment are high, and it is difficult to industrialize production. Finally, the sintered phase is very easy to produce needle-shaped Al 4 C 3 phase, which seriously affects the properties of the alloy

Method used

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  • Method for preparing graphene-aluminum matrix composite based on aluminum powder in-situ reduction and microwave hot pressing sintering
  • Method for preparing graphene-aluminum matrix composite based on aluminum powder in-situ reduction and microwave hot pressing sintering

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Stir 1g of expanded graphite into 40ml of concentrated sulfuric acid with a mass fraction of 98% under 0°C ice bath conditions and 100W ultrasonic vibration. After the temperature of the solution drops to 0°C, slowly add 4g of potassium permanganate. Control the temperature of the reaction system not to exceed 20°C, react at 0°C for 36 hours after the addition, and then slowly drop 200ml of 5% dilute sulfuric acid at 0°C to terminate the reaction, and control the temperature of the reaction system not to exceed 15°C during the dropwise addition . Finally, 5ml of hydrogen peroxide with a mass fraction of 10% was added to reduce the residual potassium permanganate, pickled twice with hydrochloric acid with a mass fraction of 5%, and then washed with water until neutral. The prepared suspension was ultrasonically ultrasonicated for 40 minutes with a power of 100W, centrifuged, Freeze-drying and grinding to obtain graphene oxide powder. Add the obtained graphene oxide powd...

Embodiment 2

[0032] Stir 1g of expanded graphite into 50ml of concentrated sulfuric acid with a mass fraction of 98% under 0°C ice bath conditions and 200W ultrasonic vibration. After the temperature of the solution drops to 0°C, slowly add 5g of potassium permanganate. Control the temperature of the reaction system not to exceed 20°C. After the addition, react at 0°C for 48 hours, slowly add 250ml of dilute sulfuric acid with a mass fraction of 5% at 0°C dropwise to terminate the reaction, and control the temperature of the reaction system not to exceed 20°C during the dropwise addition . Finally, 5ml of hydrogen peroxide with a mass fraction of 10% was added to reduce the residual potassium permanganate, 1000ml of 5% hydrochloric acid was pickled twice, and then washed with water until neutral. dry and grind to obtain graphene oxide powder. Add the obtained graphene oxide powder into water for ultrasonic dispersion to prepare a 0.2g / L graphene oxide suspension, take 200mL of graphene ox...

Embodiment 3

[0034] Stir 1g of expanded graphite into 60ml of concentrated sulfuric acid with a mass fraction of 98% under 0°C ice bath conditions and 50W ultrasonic vibration. After the temperature of the solution drops to 0°C, slowly add 3g of potassium permanganate. Control the temperature of the reaction system not to exceed 20°C. After the addition, react at 0°C for 18 hours, slowly add 180ml of dilute sulfuric acid with a mass fraction of 10% at 0°C dropwise to terminate the reaction, and control the temperature of the reaction system not to exceed 20°C during the dropwise addition . Finally, add 5ml of hydrogen peroxide with a mass fraction of 10% to reduce the residual potassium permanganate, pickle twice with 1000ml of 5% hydrochloric acid, then wash with water until neutral, use 50w ultrasonic wave for 120min, centrifuge, freeze-dry, and grind to obtain Graphene oxide powder. Add the obtained graphene oxide powder into water and ultrasonically disperse to prepare a 0.4g / L graphe...

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Abstract

The invention provides a method for preparing a graphene-aluminum matrix composite based on aluminum powder in-situ reduction and microwave hot pressing sintering. By means of the method, expanded graphite is adopted as the raw material, an oxidized graphene material with a complete lamellar structure is prepared through ultrasonic assistance and low-temperature oxidization; then graphene-aluminummatrix composite powder is obtained through copper powder modification and aluminum powder in-situ reduction; and finally, the graphene-aluminum matrix composite with high compactness and high conductivity is prepared through cold pressing forming, microwave hot pressing sintering and thermal extruding. The compactness of the composite obtained through the method is high, the comprehensive performance of the material is high, the thermal conductivity of the composite is improved by 10.5% compared with that of pure aluminum, the bending strength is improved by 31%, a good foundation is laid for preparing of the low-flaw graphene-aluminum matrix composite, and a wide application prospect is achieved.

Description

technical field [0001] The invention belongs to the field of metal-based composite material preparation, and relates to the preparation of graphene-aluminum-based composite materials, in particular to a method for preparing graphene-aluminum-based composite materials based on in-situ reduction of aluminum powder and microwave hot-pressing sintering. Background technique [0002] Aluminum matrix composite refers to a composite material that uses aluminum metal, aluminum alloy or aluminum intermetallic compound as the matrix and contains reinforcing components. It has the advantages of light weight, low density, and easy processing. It is a commonly used material in aerospace and military equipment. At this stage, aluminum matrix composite materials have become the most commonly used and most important metal composite materials. With the further improvement of the equipment requirements of the external environment, the traditional ceramic fiber and particle reinforcement can n...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C1/10C22C21/00C01B32/198
CPCC22C1/058C22C1/0416C22C21/00C01B32/198
Inventor 刘秉国宇文超张利波
Owner 徐州宇帆机电科技有限公司