Preparation method of oriented graphene/alumina composite ceramic

A graphene composite and directional arrangement technology, applied in the field of preparation of alumina-based composite ceramic materials, can solve the problems of poor electrical and thermal conductivity, low safety in use, and brittle fracture of alumina ceramics, and achieve obvious electrical conductivity and Anisotropic thermal conductivity, low cost, and excellent electrical and thermal conductivity

Inactive Publication Date: 2019-08-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although pure alumina has high strength, it is brittle like most ceramic materials. As its fatal shortcoming, it is prone to brittle fracture under high load conditions, low safety in use, and poor reliability, which greatly limits its use in various fields. Further applications in the field
Moreover, the electrical and thermal conductivity of alumina ceramics is also very poor, and the thermal conductivity of general alumina ceramics is 29.3 W.m -1 .K -1 , the conductivity is almost 0
However, there is still little research on this kind of structure-functional integration materials.

Method used

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  • Preparation method of oriented graphene/alumina composite ceramic
  • Preparation method of oriented graphene/alumina composite ceramic
  • Preparation method of oriented graphene/alumina composite ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 1 As shown, the present embodiment prepares aligned graphene / alumina composite ceramics according to the following steps:

[0039] 1: Preparation of graphene oxide: Prepare graphene oxide by chemical method: weigh 4 g flake graphite and put it in a beaker, pour 450 ml of concentrated sulfuric acid and 50 ml of phosphoric acid into the beaker to prepare a mixed solution, and stir at room temperature for 50 min. Place the beaker in a water bath for heating, add 18 g of potassium permanganate to the solution in 8 times, and heat the solution at 70 °C, take it out after 16 h and cool it at room temperature. After cooling to room temperature, slowly pour the mixed solution into 700 ml of ice water containing 6 ml of hydrogen peroxide with a mass fraction of 30%, let it stand for 24 hours, filter off the supernatant, and take the lower solution for centrifugal washing and washing. After drying, graphene oxide is obtained.

[0040] 2. Preparation of graphene o...

Embodiment 2

[0048] Such as figure 1 As shown, the present embodiment prepares aligned graphene / alumina composite ceramics according to the following steps:

[0049] 1: Preparation of graphene oxide: Prepare graphene oxide by chemical method: weigh 4 g flake graphite and put it in a beaker, pour 450 ml of concentrated sulfuric acid and 50 ml of phosphoric acid into the beaker to prepare a mixed solution, and stir at room temperature for 50 min. Place the beaker in a water bath for heating, add 18 g of potassium permanganate to the solution in 8 times, and heat the solution at 70 °C, take it out after 16 h and cool it at room temperature. After cooling to room temperature, slowly pour the mixed solution into 700 ml of ice water containing 6 ml of hydrogen peroxide with a mass fraction of 30%, let it stand for 24 hours, filter off the supernatant, and take the lower solution for centrifugal washing and washing. After drying, graphene oxide is obtained.

[0050] 2. Preparation of graphene o...

Embodiment 3

[0055] Such as figure 1 As shown, the present embodiment prepares aligned graphene / alumina composite ceramics according to the following steps:

[0056] 1: Preparation of graphene oxide: Prepare graphene oxide by chemical method: weigh 4 g flake graphite and put it in a beaker, pour 450 ml of concentrated sulfuric acid and 50 ml of phosphoric acid into the beaker to prepare a mixed solution, and stir at room temperature for 50 min. Place the beaker in a water bath for heating, add 18 g of potassium permanganate to the solution in 8 times, and heat the solution at 70 °C, take it out after 16 h and cool it at room temperature. After cooling to room temperature, slowly pour the mixed solution into 700 ml of ice water containing 6 ml of hydrogen peroxide with a mass fraction of 30%, let it stand for 24 hours, filter off the supernatant, and take the lower solution for centrifugal washing and washing. After drying, graphene oxide is obtained.

[0057] 2. Preparation of graphene o...

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Abstract

The invention discloses a preparation method of an oriented graphene/alumina composite ceramic. The method comprises the following steps: 1, preparing alumina monohydrate/graphene composite sponge; and 2, preparing an oriented graphene/alumina composite material. According to the method disclosed by the invention, water-soluble alumina monohydrate is introduced into an alumina ceramic phase, and orientation of graphene in an alumina matrix is realized by oriented freezing and oriented pressurizing in hot pressed sintering, so that a shell-like structure is obtained. The structure is capable ofendowing alumina ceramics with excellent breaking tenacity, bending strength and other mechanical properties, and enabling the alumina ceramics to achieve excellent electrical and thermal conductivity and obvious electrical and thermal anisotropic properties in an oriented direction. The process is simple, the cost is low, and an excellent alumina ceramic-based composite material with integrationof structure and function can be obtained.

Description

technical field [0001] The invention relates to a method for preparing an alumina-based composite ceramic material, in particular to a method for preparing an orientationally arranged graphene / alumina composite ceramic. Background technique [0002] Alumina (Al 2 o 3 )-based ceramic materials are one of the most widely used ceramic materials, with high mechanical strength, high hardness, good wear resistance, high temperature resistance, oxidation resistance, corrosion resistance, good chemical stability, and insensitivity to atmosphere. The manufacturing cost is low, and it has a wide range of applications in the aerospace field, engine wear-resistant parts, energy, etc. Although pure alumina has high strength, it is brittle like most ceramic materials. As its fatal shortcoming, it is prone to brittle fracture under high load conditions, low safety in use, and poor reliability, which greatly limits its use in various fields. further applications in the field. Moreover, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/624C04B35/645
CPCC04B35/10C04B35/624C04B35/645C04B2235/425C04B2235/6567
Inventor 梁磊李宜彬
Owner HARBIN INST OF TECH
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