Self-assembled boron carbide-graphene composite ceramic and preparation method thereof

A graphene composite and boron carbide technology, which is applied in the field of ceramic materials, can solve the problems of introducing impurities and graphene agglomeration, and achieve the effects of inhibiting agglomeration, high density and good repeatability

Active Publication Date: 2019-06-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this invention avoids the occurrence of graphene agglomeration in the sintering process to a certain extent, the traditional ball milling process is still used in the powder synthesis method, which will inevitably introduce impurities and still have a small amount of graphene agglomeration Phenomenon

Method used

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  • Self-assembled boron carbide-graphene composite ceramic and preparation method thereof
  • Self-assembled boron carbide-graphene composite ceramic and preparation method thereof
  • Self-assembled boron carbide-graphene composite ceramic and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] A preparation method of self-assembled boron carbide-graphene composite ceramics, comprising the following steps:

[0036] 1) Preparation of graphene oxide dispersion: Weigh 0.2 g of graphene oxide, add to 200 mL of water, stir magnetically for 1 h, and then ultrasonically disperse for 2 h to obtain a graphene oxide aqueous solution with a concentration of 1 mg / mL;

[0037] 2) Preparation of acrylamide solution: Weigh 0.2g of acrylamide, add it into 20mL of deionized water, and stir magnetically for 0.5h to obtain an acrylamide solution;

[0038] 3) Ultrasonic dispersion after mixing and stirring: Weigh 10 g of boron carbide micropowder, add it to the acrylamide solution prepared in step 2), stir magnetically for 0.5 h, then mix with the graphene oxide solution obtained in step 1), stir magnetically for 0.5 h, Ultrasonic dispersion for 1 h to obtain a mixed solution;

[0039]4) Self-assembly polymerization process: heat the mixed solution obtained in step 3) to 60°C in...

Embodiment 2

[0044] A preparation method of self-assembled boron carbide-graphene composite ceramics, comprising the following steps:

[0045] 1) Preparation of graphene oxide dispersion: Weigh 0.5 g of graphene oxide, add to 500 mL of water, stir magnetically for 1 h, and then ultrasonically disperse for 2 h to obtain a graphene oxide aqueous solution with a concentration of 1 mg / mL;

[0046] 2) Preparation of acrylamide solution: Weigh 0.5g of acrylamide, add it into 50mL of deionized water, and stir magnetically for 0.5h to obtain an acrylamide solution;

[0047] 3) Ultrasonic dispersion after mixing and stirring: Weigh 10 g of boron carbide micropowder, add it to the acrylamide solution prepared in step 2), stir magnetically for 0.5 h, then mix with the graphene oxide solution obtained in step 1), stir magnetically for 0.5 h, Ultrasonic dispersion for 1 h to obtain a mixed solution;

[0048] 4) Self-assembly polymerization process: heat the mixed solution obtained in step 3) to 60°C i...

Embodiment 3

[0053] A preparation method of self-assembled boron carbide-graphene composite ceramics, comprising the following steps:

[0054] 1) Preparation of graphene oxide dispersion: Weigh 1 g of graphene oxide, add it to 500 mL of water, stir it magnetically for 1 h, and then ultrasonically disperse it for 2 h to obtain a graphene oxide aqueous solution with a concentration of 2 mg / mL;

[0055] 2) Prepare acrylamide solution: weigh 1 g of acrylamide, add it into 100 mL of deionized water, and stir magnetically for 0.5 h to obtain an acrylamide solution;

[0056] 3) Ultrasonic dispersion after mixing and stirring: Weigh 10 g of boron carbide micropowder, add it to the acrylamide solution prepared in step 2), stir magnetically for 0.5 h, then mix with the graphene oxide solution obtained in step 1), stir magnetically for 0.5 h, Ultrasonic dispersion for 1 h to obtain a mixed solution;

[0057] 4) Self-assembly polymerization process: heat the mixed solution obtained in step 3) to 60°C...

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Abstract

The invention relates to self-assembled boron carbide / graphene composite ceramic and a preparation method thereof, and the preparation method comprises the following steps: adding boron carbide micropowder into an acrylamide solution, mixing the acrylamide solution with a graphene oxide dispersion liquid, putting the obtained mixed solution into a constant-temperature water bath kettle, heating to 60-70 DEG C, adding an initiator, a cross-linking agent and a chelating agent, heating to 80-90 DEG C, reacting for 2-5 hours, and separating out solid boron carbide / graphene mixed powder, and carrying out heat treatment on the boron carbide / graphene mixed powder in an inert atmosphere, then placing the boron carbide / graphene mixed powder in a discharge plasma sintering furnace, and sinteringin under vacuum or an argon atmosphere to obtain the self-assembled boron carbide / graphene oxide composite ceramic. The self-assembled boron carbide / graphene composite ceramic provided by the invention is high in density and high in bending strength, and moreover, reduced graphene oxide is uniformly dispersed in a matrix, so that the fracture toughness of the ceramic matrix is improved.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a self-assembled boron carbide-graphene composite ceramic and a preparation method thereof. Background technique [0002] Boron carbide has the characteristics of low density, high hardness, high melting point, high elastic modulus, low thermal expansion coefficient, good thermal conductivity, good friction resistance, excellent neutron absorption capacity and strong chemical corrosion resistance. It is used in high temperature structural materials, Bulletproof armor materials, wear-resistant materials, atomic reactor control and shielding materials have played a very important role. However, boron carbide has strong covalent bonds (covalent bond content>90%), and the grain boundaries are not easy to slip, which makes it difficult to sinter; in addition, boron carbide ceramics are very brittle and have low fracture toughness (only 2.2MPa· m 1 / 2 around),...

Claims

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Application Information

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IPC IPC(8): C04B35/563C04B35/622C04B35/634
Inventor 王为民胡兰馨王爱阳李明
Owner WUHAN UNIV OF TECH
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