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Graphene/silicon carbide composite material and preparation method thereof

A composite material and graphene technology, applied in the direction of graphene, silicon carbide, carbon compounds, etc., can solve the problems of high cost of dangerous reagents, low safety, complicated operation, etc., and achieve uniform microstructure and isotropic effect

Inactive Publication Date: 2018-11-06
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In addition, there are many physical and chemical methods for the preparation of graphene-coated composite materials, including electrostatic self-assembly method, aerosol phase method, hydrothermal synthesis method, emulsification method, covalent bonding method, chemical vapor deposition method and co- Pyrolysis, etc., however, these methods usually involve complex processes involving dangerous reagents and / or high costs, and mostly use graphene oxide (GO) as a raw material, and GO is generally obtained from graphite through strong acid oxidation, and the operation is complicated , low safety during preparation

Method used

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  • Graphene/silicon carbide composite material and preparation method thereof
  • Graphene/silicon carbide composite material and preparation method thereof
  • Graphene/silicon carbide composite material and preparation method thereof

Examples

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Embodiment 1

[0032] A preparation method of graphene-coated silicon carbide composite material, the method steps are as follows:

[0033] 1. Prepare thin flake graphite, the thickness of the graphite sheet is less than 30 μm, such as figure 1 shown.

[0034] 2. Prepare β-SiC nanoparticles with a particle size of 40-60nm, such as figure 2 shown.

[0035] 3. Mix flake graphite and β-SiC nanoparticles, the total amount of mixed powder is 20g, wherein graphite accounts for 20% of the total mass.

[0036] 4. The mixed powder is ball milled in a ball mill jar with ethanol and distilled water as the milling medium and process control reagent. Wherein, the ball-to-material ratio is 25:1, the volume ratio of ethanol and distilled water is 2:3, and the ratio of the total volume of ethanol and distilled water to the volume of the ball mill tank is 1:15. The ball milling jar is a zirconia ball milling jar, the ball milling speed is 200rpm, and the ball milling time is 50 hours;

[0037] When bal...

Embodiment 2

[0044] A preparation method of graphene-coated silicon carbide composite material, the method steps are as follows:

[0045] 1. Prepare thin flake graphite, the thickness of graphite flakes is less than 30 μm.

[0046]2. Prepare β-SiC nanoparticles with a particle size of 40-60 nm.

[0047] 3. Mix flake graphite and β-SiC nanoparticles, the total amount of the mixed powder is 10 g, and graphite accounts for 10% of the total mass.

[0048] 4. The mixed powder is ball milled in a ball mill jar with ethanol and distilled water as the milling medium and process control reagent. Wherein, the ball-to-material ratio is 30:1, the volume ratio of ethanol and distilled water is 2:3.5, and the ratio of the total volume of ethanol and distilled water to the volume of the ball mill tank is 1:10. The ball milling jar is a zirconia ball milling jar, the milling speed is 150 rpm, and the ball milling time is 30 hours.

[0049] 5. Take out the mixed abrasive, heat it to 90°C and dry it unde...

Embodiment 3

[0051] A preparation method of graphene-coated silicon carbide composite material, the method steps are as follows:

[0052] 1. Prepare thin flake graphite, the thickness of graphite flakes is less than 30 μm.

[0053] 2. Prepare β-SiC nanoparticles with a particle size of 40-60 nm.

[0054] 3. Mix flake graphite and β-SiC nanoparticles, the total amount of the mixed powder is 15g, wherein graphite accounts for 15% of the total mass.

[0055] 4. The mixed powder is ball milled in a ball mill jar with ethanol and distilled water as the milling medium and process control reagent. Among them, the ball-to-material ratio is 27:1, the volume ratio of ethanol and distilled water is 2:3.3, and the ratio of the total volume of ethanol and distilled water to the volume of the ball mill tank is 1:12.5. The ball milling jar is a zirconia ball milling jar, the ball milling speed is 300 rpm, and the ball milling time is 40 hours.

[0056] 5. Take out the mixed abrasive, heat it to 110°C ...

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Abstract

The invention aims to solve the problem existing in the prior art to prepare a graphene coated silicon carbide composite material, provides a graphene / silicon carbide composite material and a preparation method thereof, and belongs to the technical field of graphene composite materials. The method comprises the steps that laminated graphite with the appropriate size is appropriately mixed with nano silicon carbide particle powder, ethyl alcohol and distilled water are added to serve as a grinding medium and a process control reagent, sufficiently ball milling is conducted for a certain periodof time, and the nano composite material with a graphene coated silicon carbide core-shell structure is prepared. Graphene does not need to be prepared firstly, and preparation of the graphene / siliconcarbide composite material is completed under the ball milling condition. In addition, no dangerous reagents is used in the preparation process, and no high temperature and high pressure process exists. The prepared product has the more uniform microstructure and the isotropous performance.

Description

technical field [0001] The invention belongs to the technical field of graphene composite materials, in particular to a graphene-coated silicon carbide composite material and a preparation method thereof. Background technique [0002] Silicon carbide ceramics is a new material that meets the needs of future electronic equipment. However, due to its strong covalent bonds and stable chemical properties, silicon carbide also brings difficulties in sintering. Too strong covalent bonds hinder the sintering and densification of silicon carbide ceramics. In order to improve the thermal conductivity of silicon carbide ceramics, it is hoped that silicon carbide ceramics are highly pure and free of other impurities, but it is essential to introduce sintering aids in the sintering process to reduce the sintering temperature and increase the density. How to solve the contradiction between the two is the difficulty and focus of the sintering of high thermal conductivity silicon carbide c...

Claims

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Application Information

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IPC IPC(8): C01B32/19C01B32/956B82Y40/00C04B35/565
CPCB82Y40/00C01B2204/04C01P2004/03C01P2004/04C01P2004/64C04B35/565C01B32/19C01B32/956
Inventor 李娜赵大东陈睿张红梅姜正义彭兴东苗岩王明宇王岳松董燃孔祥楠王宇
Owner UNIV OF SCI & TECH LIAONING
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