Graphene modified ceramic composite material, preparation method and product

A ceramic composite material and graphene modification technology, applied in the preparation method and its parts, in the field of graphene modified ceramic composite material, can solve problems such as inability to mix uniformly, composite material brittleness, fracture failure, etc., and achieve internal organization The effect of improved structure uniformity, fracture toughness and thermal conductivity

Active Publication Date: 2021-11-19
北京石墨烯技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional ceramic / graphene composite materials mostly use graphene oxide and ceramic powder ball milling and calcination, but due to the large difference in density between graphene and ceramic powder, and graphene is easy to agglomerate, the traditional preparation method of graphene ceramic matrix composite material, graphite Both graphene and ceramic powders are difficult to disperse, and graphene and ceramic materials cannot be mixed uniformly. The uneven composition causes the composite material to be brittle, poor in fracture toughness, prone to fracture failure, and poor in thermal conductivity, which cannot meet the existing needs.

Method used

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  • Graphene modified ceramic composite material, preparation method and product
  • Graphene modified ceramic composite material, preparation method and product
  • Graphene modified ceramic composite material, preparation method and product

Examples

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preparation example Construction

[0027] see figure 1 , the embodiment of the present invention provides a kind of preparation method of graphene modified ceramic composite material, comprises the following steps:

[0028] S10, ceramic powder and graphene nanosheet dispersion liquid are provided, and described graphene nanosheet dispersion liquid comprises graphene nanosheet, and the mass ratio of described ceramic powder body and described graphene nanosheet is (50~200): 1;

[0029] S20, placing the ceramic powder in the cavity of the die casting machine, placing the graphene nanosheet dispersion in the pressure chamber of the die casting machine, and making the graphene nanosheet dispersion Enter the cavity of the die casting machine and mix with the ceramic powder, and the mixture is dried to obtain a graphene ceramic mixed powder, wherein the injection specific pressure of the die casting machine is 20MPa~50MPa, and the injection speed is 0.5m / s~5m / s, the holding time is 10s~180s; and

[0030] S30, mol...

Embodiment 1

[0069] (1) Provide ceramic dispersion

[0070] Ceramic material: spherical silicon nitride with a particle size of 2 microns to 3 microns. First solvent: water. The first dispersant: polyethylene glycol.

[0071] Add 100g of spherical silicon nitride with a particle size of 2 to 3 microns and 2g of polyethylene glycol into 198g of water, stir and mix uniformly for 3 hours to obtain a spherical silicon nitride dispersion.

[0072] (2) Preparation of ceramic powder

[0073] The ceramic dispersion in step (1) is put into an oven for drying, and the temperature of the oven is set at 60° C. to obtain a spherical silicon nitride powder with a water content of less than 1%.

[0074] (3) Provide graphene nanosheet dispersion

[0075] Graphene nanosheets: the number of layers is 1 to 5 layers, and the sheet diameter is 1 micron to 5 microns. The graphene nanosheets are prepared by those skilled in the art through known processes.

[0076] Second solvent: N,N-dimethylformamide.

...

Embodiment 2

[0083] The preparation method obtained in Example 1 is basically the same, except that the specific injection pressure is 30 MPa.

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Abstract

The invention relates to a method for preparing a graphene-modified ceramic composite material, comprising the following steps: providing a ceramic powder and a graphene nanosheet dispersion, the graphene nanosheet dispersion comprising graphene nanosheets, and the ceramic powder The mass ratio of the body and the graphene nanosheet is (50~200):1; the ceramic powder is placed in the die cavity of the die casting machine, and the graphene nanosheet dispersion is placed in the die casting machine Pressure chamber, under the action of injection, the graphene nanosheet dispersion liquid enters the die cavity of the pressure casting machine and mixes with the ceramic powder, and the mixture is dried to obtain a graphene ceramic mixed powder, wherein the pressure of the pressure casting machine The specific injection pressure is 20MPa-50MPa, the injection speed is 0.5m / s-5m / s, the holding time is 10s-180s; and the graphene ceramic mixed powder is formed and sintered. The invention further relates to a graphene-modified ceramic composite material and a product.

Description

technical field [0001] The invention relates to the technical field of ceramic-based composite materials, in particular to a graphene-modified ceramic composite material, a preparation method and a product thereof. Background technique [0002] Compared with alloy materials, ceramic materials have high hardness, low thermal expansion coefficient, high temperature resistance, and corrosion resistance. application potential. However, due to its material characteristics, ceramic materials have the disadvantages of high brittleness, low fracture toughness, and low thermal conductivity. During use, failures often occur, and the reliability of ceramic products is poor, which limits the development of ceramic materials. Moreover, with the continuous improvement of the performance requirements of ceramics in the industrial field, the research on the modification of ceramic materials is imminent. [0003] Graphene is a honeycomb two-dimensional planar structure material composed of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/587C04B35/581C04B35/565C04B35/563C04B35/18C04B35/10C04B35/00C04B35/622C04B35/626C04B35/63
CPCC04B35/00C04B35/10C04B35/18C04B35/563C04B35/565C04B35/581C04B35/587C04B35/622C04B35/62605C04B35/6261C04B35/6303C04B2235/422
Inventor 曹振陈冉张海平罗圭纳李炯利王旭东
Owner 北京石墨烯技术研究院有限公司
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