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Preparation method of graphene ceramic material

A technology of ceramic materials and graphene, which is applied in the field of materials, can solve problems such as easy agglomeration and uneven dispersion, and achieve the effects of improved electrical conductivity, obvious growth, and obvious macroscopic mechanical properties

Active Publication Date: 2017-12-12
锐竑(上海)新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the field of ceramic composite materials, one-dimensional carbon fibers, carbon nanotubes and ceramic whiskers are usually used as reinforcing phases to improve material performance, but these reinforcing materials such as carbon nanotubes are often unevenly dispersed in the matrix and are prone to agglomeration

Method used

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  • Preparation method of graphene ceramic material
  • Preparation method of graphene ceramic material
  • Preparation method of graphene ceramic material

Examples

Experimental program
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Effect test

preparation example Construction

[0021] Such as figure 1 As shown, a method for preparing a graphene ceramic material is characterized in that it includes the following steps: 1) taking graphene to make a graphene impregnation solution; 2) performing debinding treatment on zirconia ceramics; 3) making the Vacuum pressure impregnation of the graphene impregnating solution and the degummed zirconia ceramics obtained in step 2 to obtain a graphene-zirconia ceramic composite preform; 4) microwave sintering of the graphene-zirconia ceramic composite preform, A graphene-zirconia ceramic composite material is obtained.

[0022] The graphene impregnation solution in the step 1 contains 1-10 parts of graphene per 100 parts, 0.5-5 parts of dispersant, and the balance is solvent. The preparation of the impregnation solution includes the following steps: 1) Take graphene, Prepare graphene into powder; 2) Mix graphene powder and dispersant to obtain a mixture; 3) Put the mixed mixture into a ball mill, and use a combinat...

Embodiment 1

[0030] Such as figure 2 as shown, figure 2 For the electrical conductivity test of graphene zirconia ceramic material of the present invention, from figure 2 It can be seen that the electrical conductivity of the original zirconia is very weak, less than 0.001 S / cm, almost non-conductive, in line with the characteristics of pure ceramic materials, but after adding graphene, its electrical conductivity is exceptionally excellent, and the electrical conductivity continues to increase, because graphite The electron mobility of alkene exceeds 15000cm2 / V s, and graphene is added to the zirconia matrix, which increases the movable electrons in the zirconia matrix, resulting in an increase in the conductivity of the graphene zirconia ceramic material. It shows that graphene is not diffusely distributed in the ceramic matrix, but a network-like dense elemental structure. The graphene ceramic composite material prepared by the invention has changed from the insulator characteristi...

Embodiment 2

[0032] Such as image 3 as shown, image 3 It is the microscopic electron microscope topography of graphene zirconia ceramic materials prepared by impregnation process of graphene suspension with different concentrations. Part A is a zirconia matrix material, part B is a composite material of zirconia plus 0.4mg / ml graphene, part C is a composite material of zirconia plus 0.6mg / ml graphene, and part D is a composite material of zirconia plus 0.8mg / ml graphene. ml graphene composites. Depend on image 3It can be seen that the effect of different graphene content on its grain size is not obvious. Analyzing the reasons, first, graphene is evenly distributed in the matrix, which has a pinning effect on the grain growth; second, it is reported that graphene has a very high thermal conductivity (5300Wm-1 ▪K-1), and in the matrix The uniform distribution of graphene can not only make the sintering temperature more uniform during sintering, but also make the zirconia grains have a...

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Abstract

The invention relates to the field of materials, specifically relates to a preparation method of a graphene ceramic material. The preparation method comprises the following steps: (1) taking graphene to prepare a graphene impregnation liquid; (2) carrying out glue discharge treatment on zirconia ceramic; (3) carrying out vacuum pressing impregnation on the graphene impregnation liquid obtained in the first step and the zirconia ceramic after glue discharge obtained in the second step so as to obtain a graphene-zirconia ceramic composite material perform; (4) carrying out microwave sintering on the graphene-zirconia ceramic composite material perform so as to obtain a graphene-zirconia ceramic composite material. Compared with the prior art, the bending strength, breaking tenacity and hardness of the prepared graphene-zirconia ceramic composite material are obviously improved by 37.68%, 35.89% and 18.34% respectively when being compared with those of a relatively common ceramic material, and the macro-mechanical properties are obviously increased; compared with that of a common ceramic material, the electrical conductivity is obviously improved, and the graphene is free of dispersed distribution in a ceramic base body but is of a network-like compact simple-substance structure.

Description

technical field [0001] The invention relates to the field of materials, in particular to a method for preparing a graphene ceramic material. Background technique [0002] Ceramics have a series of advantages such as good chemical stability, high temperature resistance, corrosion resistance, and outstanding basic mechanical properties. wider application. In the field of medical devices, bioceramics have been applied to a certain extent. For example, zirconia ceramics have been widely used in the field of oral restoration, but the low-temperature aging phenomenon of zirconia is also a key factor affecting its further application. Therefore, the research and development of new materials for ceramic substrates to solve or reduce the inherent defects of ceramic materials is the basis for promoting the application of ceramic materials in various fields such as industry, medical treatment, aerospace, and military industry, and it is also the key for enterprises to open up markets ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622
CPCC04B35/48C04B35/622C04B2235/425C04B2235/5445C04B2235/616C04B2235/96
Inventor 王利斌田万鸿季璐
Owner 锐竑(上海)新材料科技有限公司
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