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A kind of graphene ceramic composite material prepared by sol-gel method and preparation method thereof

A technology of ceramic composite materials and ceramic materials, which is applied in the field of composite material preparation, can solve problems such as poor dispersion and easy agglomeration of graphene, and achieve the effects of not being easy to agglomerate, solving easy agglomeration, and good compatibility

Active Publication Date: 2015-09-09
UNIV OF SCI & TECH OF CHINA
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides a graphene ceramic composite material prepared by a sol-gel method and a preparation method thereof in order to avoid the shortcomings of the above-mentioned prior art, and utilizes graphene oxide and ceramic precursors in the sol-gel process in-situ reaction to overcome the problems of easy agglomeration and poor dispersion of graphene in existing graphene ceramic composites

Method used

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  • A kind of graphene ceramic composite material prepared by sol-gel method and preparation method thereof
  • A kind of graphene ceramic composite material prepared by sol-gel method and preparation method thereof
  • A kind of graphene ceramic composite material prepared by sol-gel method and preparation method thereof

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Embodiment 1

[0043] In this embodiment, tetraethyl silicate is used as a ceramic precursor, and a graphene ceramic composite material is prepared according to the following steps:

[0044] a. Dissolve 0.15 g of graphene oxide in 20 mL of distilled water, and disperse ultrasonically for 2 hours to obtain a graphene oxide suspension;

[0045] b. Add 20 mL of tetraethyl silicate (TEOS) and 10 mL of absolute ethanol to the graphene oxide suspension obtained in step a, stir at room temperature for 2 h, then add 40 mL of distilled water to obtain a solution to be reacted;

[0046] c. In a cold water bath with a temperature of 10°C, add 1M HCl to the reaction solution obtained in step b while stirring until pH = 1, then continue to stir in a cold water bath for 1 hour, and finally add 30 mL of absolute ethanol Continue to stir for 10 minutes;

[0047] d. Remove the cold water bath, and then heat and stir the solution obtained in step c at 50° C. for 7 days, and the solution becomes a black jelly; ...

Embodiment 2

[0055] In this embodiment, aluminum sec-butoxide is used as a ceramic precursor, and a graphene ceramic composite material is prepared according to the following steps:

[0056] a. Dissolve 0.3g of graphene oxide in 20mL of distilled water, and ultrasonically disperse to obtain a graphene oxide suspension;

[0057] b. Add 20 mL of aluminum sec-butoxide and 10 mL of absolute ethanol to the graphene oxide suspension obtained in step a, stir at room temperature for 2 h, then add 40 mL of distilled water to obtain a solution to be reacted;

[0058] c. In a cold water bath with a temperature of 10°C, add 2M NaOH to the solution to be reacted in step b while stirring until pH = 8, then continue to stir in the cold water bath for 1 hour, and finally add 30 mL of absolute ethanol to continue stirring 10min;

[0059] d. Remove the cold water bath, and then heat and stir the solution obtained in step c at 50° C. for 3 days, and the solution becomes a black jelly;

[0060] e. Bake the ...

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Abstract

The invention discloses a graphene-ceramic composite material prepared by a sol-gel process and a preparation method thereof. The method is characterized in that a ceramic precursor and graphene oxide used as raw materials are subjected to in-situ reaction by a sol-gel process, so that the graphene oxide is reduced into graphene, and the ceramic precursor becomes the ceramic material, thereby obtaining the graphene-ceramic composite material composed of the ceramic material and the flake graphene intercalated in the ceramic material. The oxygen-containing functional group on the graphene oxide and the ceramic precursor are subjected to in-situ reaction; since the ceramic precursor and graphene oxide have the bonding action, the graphene oxide flake can not easily aggregate, and has favorable compatibility in the ceramic system; and after the sol-gel process, the ceramic precursor becomes the ceramic material, and the graphene oxide is reduced into the graphene, thereby solving the problems of high aggregation tendency and poor dispersity of the graphene in the ceramic matrix material.

Description

technical field [0001] The invention relates to a graphene ceramic composite material and a preparation method thereof, more specifically to a graphene ceramic composite material prepared by a sol-gel method, and belongs to the field of composite material preparation. Background technique [0002] Graphene, English name Graphene, is a two-dimensional lattice structure in which carbon atoms are arranged in a hexagonal manner. As a single-layer carbon-atom planar material, graphene can be obtained by exfoliating graphite materials. Graphene has become the focus of scientific and industrial attention since the graphite crystal film was discovered by scientists at the University of Manchester in 2004. The thickness of graphene is only 0.335 nanometers, which is not only the thinnest among known materials, but also very firm and hard; as a simple substance, it transfers electrons faster than all known conductors and semiconductors at room temperature (graphene Electrons move at...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/52C04B35/14C04B35/10C04B35/622
Inventor 朱彦武袁林
Owner UNIV OF SCI & TECH OF CHINA
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