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Preparation method of high-toughness biomimetic structured graphene-based ceramic composite material

A ceramic composite material and graphene-based technology, applied in the field of preparation of graphene-based ceramic composite materials, can solve problems such as low strength, achieve high fracture toughness, improve thermal conductivity and electrical properties, and avoid stress matching.

Inactive Publication Date: 2019-04-19
SHANGHAI LEVSON ENTERPRISE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method crystallizes graphene and coats it on the surface of ceramic crystals to form a shell-like layered structure composite material with high density, high stiffness and high fracture toughness, which greatly improves the cracking and low strength caused by the mismatching bonding strength of the interface layer. In addition, it can also promote graphene to cooperate with ceramic materials to improve the thermal conductivity and electrical properties of composite materials. It has great application potential in mobile communications, military, ships, aerospace and other fields.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A 3w.t.% graphene slurry was prepared, wherein the graphene had a horizontal size of 5 μm and a vertical thickness of 1.5 nm. The graphene slurry was uniformly mixed by ball milling method, and the ball mill speed was 400r / min, and the grinding was carried out for 2 hours. Add 0.1w.t.% sodium dodecylsulfonate to 1w.t.% polytetrafluoroethylene aqueous solution, and after fully dispersed, add 50w.t.% silicon nitride ceramic powder with an average particle size of 5 μm. The ceramic slurry was uniformly mixed by ball milling, and the speed of the ball mill was 400 r / min, and the grinding was performed for 2 hours. Inject the ceramic slurry into a flat mold for freeze-drying, and set the electrostatic field strength to 5×10 4 V / m, the one-way freezing temperature is -10°C, and the drying pressure is 20Pa. After the silicon nitride ceramic plate is dried and vacuum-impregnated in the prepared graphene slurry, the prefabricated plate is taken out and subjected to microwave s...

Embodiment 2

[0024] Prepare 1w.t.% graphene slurry, wherein the graphene has a horizontal size of 15 μm and a vertical thickness of 0.6 nm. The graphene slurry was uniformly mixed by ball milling method, and the ball mill speed was 400r / min, and the grinding was carried out for 2 hours. Add 0.5w.t.% ammonium polyacrylate to 5w.t.% polyurethane aqueous emulsion, and after fully dispersed, add 50w.t.% silicon carbide ceramic powder with an average particle size of 500nm. The ceramic slurry was uniformly mixed by ball milling, and the speed of the ball mill was 400 r / min, and the grinding was performed for 2 hours. Inject the ceramic slurry into a flat mold for freeze-drying, and set the electrostatic field strength to 9×10 4 V / m, the one-way freezing temperature is -70°C, and the drying pressure is 80Pa. After the silicon carbide ceramic plate is dried and vacuum-impregnated in the prepared graphene slurry, the prefabricated plate is taken out and subjected to microwave sintering under the...

Embodiment 3

[0026] Prepare a 3w.t.% graphene slurry, wherein the graphene has a horizontal size of 10 μm and a vertical thickness of 1.5 nm. The graphene slurry was uniformly mixed by ball milling method, and the ball mill speed was 400r / min, and the grinding was carried out for 2 hours. Add 0.3w.t.% polyethylene glycol p-isooctyl phenyl ether to 3w.t.% polyvinyl alcohol aqueous solution, and after fully dispersing, add 35w.t.% silicon carbide ceramic powder with an average particle diameter of 200nm. The ceramic slurry was uniformly mixed by ball milling, and the speed of the ball mill was 400 r / min, and the grinding was performed for 2 hours. Inject the ceramic slurry into a flat mold for freeze-drying, and set the electrostatic field strength to 9×10 4 V / m, the one-way freezing temperature is -50°C, and the drying pressure is 80Pa. After the silicon carbide ceramic plate is dried and vacuum-impregnated in the prepared graphene slurry, the prefabricated plate is taken out and subjecte...

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Abstract

The invention discloses a preparation method of a high-toughness biomimetic structured graphene-based ceramic composite material. The preparation method comprises the following steps: preparing layered porous ceramic blank body by adopting an electrostatic field freeze-drying method, treating by a vacuum infiltration process to make graphene to be completely impregnated into pores of the prefabricated blank, carrying out microwave sintering in the inert gas protection, crystallizing graphene and coating the ceramic crystal surface with graphene crystal to form the microscopic continuously distributed layered shell-like graphene-based ceramic composite material. Compared with traditional ceramic materials, the composite ceramic material has high density and fracture toughness; with excellent performance of graphene, the thermal and electrical properties of the material are significantly improved. The preparation method has huge application value in the fields of transportation, architecture, aerospace, military and the like.

Description

technical field [0001] The invention relates to a method for preparing a graphene-based ceramic composite material, and belongs to the technical field of preparation and application of functional ceramic materials. Background technique [0002] For the research on the imitation shell structure of ceramic materials, rolling film, tape casting, centrifugal casting, electrophoretic deposition, etc. are generally used. The structural design is not fine enough, and it is basically a simple superposition of parallel layer structures. The interface layer has a great influence on the strength of the material. Large, it is easy to cause layer cracking, etc., and there are still many problems to be solved in the manufacturing process. Contents of the invention [0003] The invention discloses a high-toughness bionic structure graphene-based ceramic composite material. The preparation method crystallizes graphene and coats it on the surface of ceramic crystals to form a shell-like l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/565C04B35/626C04B35/80
CPCC04B35/806C04B35/565C04B35/584C04B35/62685C04B2235/425C04B2235/616C04B2235/77C04B2235/96C04B2235/9607
Inventor 张燕萍赵志国
Owner SHANGHAI LEVSON ENTERPRISE GRP
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