Preparation method of isotropic graphite material

A graphite material and isotropic technology, which is applied in the field of preparation of isotropic graphite materials, can solve the problems of large-area cracking, poor mechanical properties, and high porosity of products, and achieve stable product quality, excellent performance, and improved compactness. Effect

Active Publication Date: 2020-01-07
山东晨阳新型碳材料研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) In practice, it is found that the existing graphite preparation technologies using mesocarbon microspheres as raw materials have large-area cracking in the process of molding and sintering, and the final yield is extremely low
[0005] 2) Poor mechanical properties, high brittleness and high porosity
[0006] 3) The mesophase petroleum pitch fiber can only become flexible and have a certain mechanical strength after non-melting treatment, but the existing gas oxidation technology has the problems of long time consumption and large investment

Method used

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Embodiment 1

[0038] A preparation method of isotropic graphite material, comprising the following steps:

[0039] ①Sieving mesophase carbon microspheres after crushing to obtain mesophase carbon microsphere granulation powders with different particle sizes;

[0040] ②Crush the chopped carbon fiber and pass through a 400-mesh sieve to obtain the chopped carbon fiber granulated powder;

[0041] ③The mesophase carbon microsphere granulation powder and chopped carbon fiber granulation powder with 20wt% particle size of 5-10μm, 35wt% particle size of 20-30μm, and 45wt% particle size of 40-50μm were subjected to liquid phase dispersion method Doping and mixing modification with wet ball milling. The dispersant used in the liquid phase dispersion method is sodium dodecylbenzenesulfonate. When wet ball milling, ball: material: water = 2.5:1:0.8, mesophase carbon microspheres The mass ratio of the granulated powder and the chopped carbon fiber granulated powder is 95:5 to obtain a modified mesopha...

Embodiment 2

[0048] A preparation method of isotropic graphite material, comprising the following steps:

[0049] ①Sieving mesophase carbon microspheres after crushing to obtain mesophase carbon microsphere granulation powders with different particle sizes;

[0050] ②Crush the chopped carbon fiber and pass through a 600-mesh sieve to obtain the chopped carbon fiber granulated powder;

[0051]③ 38wt% of mesophase carbon microsphere granulation powder and chopped carbon fiber granulation powder with particle size of 5-10 μm, 22wt% of particle size of 20-30 μm, and 40wt% of particle size of 40-50 μm were subjected to liquid phase dispersion and Wet ball milling is used for doping and mixing modification. The dispersant used in the liquid phase dispersion method is sodium dodecylbenzenesulfonate. Ball: material: water = 3:1:0.8 during wet ball milling, mesophase carbon microspheres The mass ratio of granular powder and chopped carbon fiber granulated powder is 98:2, obtains modified mesophase...

Embodiment 3

[0058] A preparation method of isotropic graphite material, comprising the following steps:

[0059] ①Sieving mesophase carbon microspheres after crushing to obtain mesophase carbon microsphere granulation powders with different particle sizes;

[0060] ②Crush the chopped carbon fiber and pass through a 500-mesh sieve to obtain chopped carbon fiber granulation powder;

[0061] ③The mesophase carbon microsphere granulation powder and chopped carbon fiber granulation powder with 35wt% particle size of 5-10 μm, 15wt% particle size of 20-30 μm, and 50wt% particle size of 40-50 μm were subjected to liquid phase dispersion and Wet ball milling is used for doping and mixing modification. The dispersant used in the liquid phase dispersion method is sodium dodecylbenzenesulfonate. During wet ball milling, ball: material: water = 2.8:1:0.8, mesophase carbon microspheres The mass ratio of granular powder and chopped carbon fiber granulated powder is 90:10, obtains modified mesophase car...

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Abstract

The invention discloses a preparation method of an isotropic graphite material. The preparation method specifically comprises the following steps: doping mesocarbon microbeads with different particlesizes with chopped carbon fibers, carrying out liquid-phase oxidation treatment, carrying out compression molding by a secondary cold isostatic pressing method, and carrying out carbonization and graphitization. According to the invention, the problem of low yield caused by product cracking in the existing ink preparation technology taking the mesocarbon microbeads as a raw material is effectivelysolved, the bending strength of the graphite material is also improved, the compactness is improved, and the resistivity and the aperture ratio are reduced, so that the performance of the graphite material is improved.

Description

technical field [0001] The invention relates to the technical field of graphite materials, in particular to a preparation method of isotropic graphite materials. Background technique [0002] Graphite is an indispensable conductive material and structural material for the development of national economy such as metallurgy, chemical industry, electronics and nuclear industry. It has high thermal conductivity, low thermal expansion coefficient, good flexural strength, compressive strength and chemical stability. The graphite crystal structure is a mixed crystal structure: the atoms on the layer are arranged in a hexagonal grid, the atomic spacing is small, and the bonding force is strong; the spacing between the layers is large, and the bonding force is weak; so its plane direction and perpendicular to the plane direction The difference in properties is relatively large, which is the so-called "anisotropy". However, many special occasions have put forward the requirement of "...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/52C04B35/622
CPCC04B35/83C04B35/522C04B35/622C04B2235/602C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96
Inventor 张海霞闫桂林闫萍胡春燕余萍王方丽谭程程
Owner 山东晨阳新型碳材料研究院有限公司
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