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Preparation method of graphene/aluminum composite material

An aluminum composite material and graphene technology, which is applied in the field of composite material preparation, can solve the problems of low quality and low strength of graphene/aluminum composite materials, and achieve easy industrial production and application, low thermal expansion coefficient, specific stiffness and Effect of Specific Intensity Coefficient Enhancement

Active Publication Date: 2016-03-09
TANGSHAN JIANHUA TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low quality and low strength of the graphene / aluminum composite material prepared by the above-mentioned solid-state method, the present invention provides a method for preparing a high-quality graphene / aluminum composite material by a liquid method, and the prepared composite material has high Strength, low thermal expansion coefficient, etc., and easy to realize industrial production and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1, take 150mL of graphene aqueous solution with a mass fraction of 0.1%, ultrasonicate for 20min to make it evenly dispersed, and set aside;

[0024] Step 2, according to the calculation that the mass ratio of graphene oxide to aluminum powder is 0.001:1, take 10 g of the obtained graphene oxide aqueous solution, and lower the temperature to below 5°C, slowly add 10 g of aluminum powder at a speed of 100~1000 rpm, control The temperature is less than 5°C, and the stirring time is 1 to 2 hours to obtain a uniform aqueous solution of graphene oxide containing aluminum powder;

[0025] In step 3, the aqueous solution obtained in step 2 is subjected to solid-liquid separation through a low-temperature centrifugation process, and the separated paste solid is subjected to a freeze-drying process to obtain a graphene oxide / aluminum composite dry powder;

[0026] Step 4, the obtained graphene oxide / aluminum composite dry powder is heated in Ar / H 2 Thermal reduction was ca...

Embodiment 2

[0028] Step 1: Take 150mL of graphene aqueous solution with a mass fraction of 1%, ultrasonicate for 20min to make it evenly dispersed, and set aside;

[0029] Step 2, according to the calculation that the mass ratio of graphene oxide and aluminum powder is 0.1:1, take 100 g of the obtained graphene oxide aqueous solution, and lower the temperature to below 5°C, slowly add 10 g of aluminum powder at a speed of 100~1000 rpm, control The temperature is less than 5°C, and the stirring time is 1 to 2 hours to obtain a uniform aqueous solution of graphene oxide containing aluminum powder;

[0030] Step 3 is the same as in Embodiment 1, and will not be described in detail;

[0031] Step 4, the obtained graphene oxide / aluminum composite dry powder is heated in Ar / H 2 Thermal reduction was carried out in a mixed gas, the reduction temperature was 450 °C, the constant temperature time was 1 h, and the gas flow rate was 800 mL / min, and finally a graphene / aluminum composite material wit...

Embodiment 3

[0033] Step 1, take 150mL of graphene aqueous solution with a mass fraction of 2%, ultrasonicate for 20min to make it evenly dispersed, and set aside;

[0034] Step 2, according to the calculation that the mass ratio of graphene oxide to aluminum powder is 0.2:1, take 100 g of the obtained graphene oxide aqueous solution, and lower the temperature to below 5°C, slowly add 10 g of aluminum powder at a speed of 100~1000 rpm, control The temperature is less than 5°C, and the stirring time is 1 to 2 hours to obtain a uniform aqueous solution of graphene oxide containing aluminum powder;

[0035] Step 3, with embodiment 1, no longer repeats;

[0036] Step 4, the obtained graphene oxide / aluminum composite dry powder is heated in Ar / H 2 Thermal reduction was carried out in a mixed gas, the reduction temperature was 500 °C, the constant temperature time was 1.5 h, and the gas flow rate was 600 mL / min, and finally a graphene / aluminum composite material with a mass fraction of 20% was ...

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Abstract

The invention discloses a preparation method of a graphene / aluminum composite material. The preparation method comprises the following steps that a graphene oxide aqueous solution is subjected to ultrasonic treatment and is evenly dispersed; the obtained graphene oxide aqueous solution is cooled to be below 5 DEG C, aluminum power is slowly added in a stirring state, the temperature is controlled to be smaller than 5 DEG C, the stirring speed is 100-1,000 turns / min, the stirring duration is 1-2 hours, and the uniform graphene oxide aqueous solution with aluminum power is obtained; solid-liquid separation is carried out through a low-temperature centrifugal process, a pasty solid obtained after separation is treated through a freeze-drying process, and then graphene oxide / aluminum composite dry powder is obtained; and the graphene oxide / aluminum composite dry powder is subjected to heat reduction in Ar / H2 mixed gas, and finally the graphene / aluminum composite material is obtained. The prepared graphene / aluminum composite material has the advantages of being high in strength, low in heat expansion factor and the like, and the specific stiffness and specific strength factors are obviously increased; and the preparation method is simple and efficient, and industrial production and application can be achieved easily.

Description

technical field [0001] The invention relates to a preparation method of a composite material, in particular to a preparation method of a graphene / aluminum composite material. Background technique [0002] Graphene is the toughest material with the best electrical and thermal conductivity found in the laboratory so far. Its strength is as high as 1.01TPa, which is 100 times that of structural steel, but its density is 1 / 5 of that of structural steel. Graphene is considered to be a very promising reinforcement due to its low density, high mechanical properties, high thermal conductivity, and low thermal expansion. Adding graphene into the metal matrix to obtain a new type of composite material, this type of composite material has the characteristics and functions that people need, so the research on using graphene to strengthen metal matrix (especially aluminum matrix) composite materials has attracted widespread attention . [0003] Since 2011, researchers from various coun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C1/10C22C21/00
CPCC22C1/04C22C1/10C22C1/1005C22C21/00
Inventor 吴洪鹏孟英侯林艳王建华李小莉
Owner TANGSHAN JIANHUA TECH DEV
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