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Preparation method for graphene-ceramic composite material

A ceramic composite material and ceramic composite technology, applied in the field of graphene composite materials, can solve the problems of unfavorable mixing and dispersion of ceramic powder, increase of process cycle and cost, environmental hazards, etc., and achieve the effect of low cost, optimized performance and short cycle

Active Publication Date: 2018-05-18
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to remove the impurity phases such as magnesium oxide generated by the reaction, this method usually requires repeated pickling of the product, which increases the process cycle and cost, and also brings potential environmental hazards.
In addition, for the preparation of graphene ceramic composite materials, the graphene powder obtained after repeated pickling and drying is not conducive to the mixing and dispersion of ceramic powder due to the high specific surface area and easy agglomeration.

Method used

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  • Preparation method for graphene-ceramic composite material
  • Preparation method for graphene-ceramic composite material
  • Preparation method for graphene-ceramic composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of preparation of graphene ceramic composite material, comprises the steps:

[0039] Step 1, get 10g average particle diameter and be that the magnesium powder of 100 μ m and 90g average particle diameter be the Al of 200nm 2 o 3 The powder is ball milled for 1 hour and mixed evenly;

[0040] Step 2, place the uniformly mixed raw material powder in the graphite mold of the combustion reaction device, in the carbon dioxide gas of 0.5MPa, use a 50A tungsten coil to induce the self-propagating combustion reaction between the magnesium powder in the raw material and carbon dioxide, and cool the device Finally, a gray-black graphene ceramic composite powder is obtained.

[0041] Step 3: Using spark plasma sintering, the graphene ceramic composite powder is sintered under a pressure of 60 MPa at 1500° C. for 30 minutes in vacuum to obtain a graphene ceramic composite material with a diameter of 30 mm and a thickness of 3 mm.

[0042] figure 1 Middle (a) is the X-ra...

Embodiment 2

[0048] A kind of preparation of graphene ceramic composite material, comprises the steps:

[0049] Step 1, take 9g of magnesium powder with an average particle size of 45 μm and 9.69g of MgO powder with an average particle size of 100nm and 62.31g of Al with an average particle size of 200nm 2 o 3 The powder is ball milled for 1 hour and mixed evenly;

[0050] Step 2, place the uniformly mixed raw material powder in the graphite mold of the combustion reaction device, in the carbon dioxide gas of 1.0MPa, use a 40A tungsten coil to induce the self-propagating combustion reaction between the magnesium powder in the raw material and carbon dioxide, and cool the device Finally, a gray-black graphene ceramic composite powder is obtained.

[0051] Step 3: Using spark plasma sintering, the graphene ceramic composite powder is sintered under a pressure of 60 MPa at 1400° C. for 20 minutes in vacuum to obtain a graphene ceramic composite material with a diameter of 10 mm and a thickn...

Embodiment 3

[0057] A kind of preparation of graphene ceramic composite material, comprises the steps:

[0058] Step 1, getting 10g average particle diameter is that the magnesium powder of 25 μm and 68g average particle diameter are the ZrO of 500nm 2 Powder and 2g of Y with an average particle size of 50nm 2 o 3 The powder is ball milled for 1 hour and mixed evenly;

[0059] Step 2, place the uniformly mixed raw material powder in the graphite mold of the combustion reaction device, in the carbon dioxide gas of 2.0MPa, use a 30A tungsten coil to induce the self-propagating combustion reaction between the magnesium powder in the raw material and carbon dioxide, and cool the device Finally, a gray-black graphene ceramic composite powder is obtained.

[0060] Step 3: Using pressureless sintering, the graphene ceramic composite powder is formed by cold isostatic pressing under a pressure of 200 MPa, and then sintered at 1500° C. for 4 hours under vacuum to obtain a graphene ceramic compos...

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Abstract

The invention discloses a preparation method for a graphene-ceramic composite material, which comprises the following steps: magnesium powder and ceramic powder are uniformly mixed, so that mixed powder is obtained, the mixed powder is burned in carbon dioxide gas to react, so that graphene-ceramic composite powder is obtained, and the graphene-ceramic composite powder is shaped and sintered, so that the graphene-ceramic composite material is obtained. The preparation method disclosed by the invention has the characteristics of simple process, short preparation period, low cost and the like, and the prepared graphene-ceramic composite material has the characteristics of uniform component structure, excellent properties and the like. The preparation method utilizes the characteristic of in-situ deposition combination in the gas-solid reaction between magnesium and carbon dioxide to realize the uniform mixing and dispersion of graphene and the ceramic powder on a microscale.

Description

technical field [0001] The invention relates to the technical field of graphene composite materials. More specifically, it relates to a method for preparing a graphene ceramic composite material. Background technique [0002] Graphene has excellent properties such as high modulus, high strength, high electron mobility and high thermal conductivity. Combining graphene with ceramic materials can significantly improve the mechanical, thermal, electrical and optical properties of ceramic materials, and has broad application prospects in many fields. [0003] At present, there are two main methods for preparing graphene ceramic composite materials. One is to mix graphene prepared by methods such as graphite oxide reduction, chemical vapor deposition, epitaxial growth or organic synthesis with ceramic powder, and then sinter it to prepare it. It is prepared by high-energy ball milling of expanded graphite and ceramic powder, exfoliation in situ to obtain graphene ceramic composi...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622C04B35/626C04B35/48C04B35/584C04B35/565C04B35/58C04B35/14
CPCC04B35/10C04B35/14C04B35/48C04B35/565C04B35/58078C04B35/584C04B35/622C04B35/6265C04B2235/3206C04B2235/3225C04B2235/77C04B2235/96C04B2235/9646
Inventor 贺刚鲁楠李宏华李江涛
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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