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Preparation method of high-performance isotropic graphite material

A technology of isotropic and graphite materials, applied in the field of preparation of high-performance isotropic graphite materials, can solve the problems of uneven distribution of elements, low utilization rate, etc.

Inactive Publication Date: 2017-08-18
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually doping is a method of mixing micron-sized particles. Due to the large particle size of the doped components, there are disadvantages of uneven element distribution and low utilization rate, and reducing the particle size of the doped components can largely Overcome the above disadvantages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] This example is a comparative example. Take mesophase pellets with an average diameter of 15 μm, the volatile content of which is 10.2 wt%, put the pellets into a mold, press at 200 MPa for 2 hours, and obtain a primary green body after demolding, and place the green body in a non-oxidizing atmosphere Medium carbonization to 1200°C, and then graphitization at 2100°C to obtain graphite material. The material has a flexural strength of 97MPa and a density of 1.70 g / cm 3 , isotropy 1.06, 20.9wt% weight loss in air at 1200°C for 1 hour.

Embodiment 2

[0018] Take mesophase pellets with an average diameter of 15 μm, and the volatile content of the pellets is 10.2 wt%. Use silica sol with a solid content of 20% to impregnate the pellets under vacuum, dry the pellets at 120°C, put the pellets into a mold, press at 100MPa for 2 hours, and obtain a primary green body after demoulding. Carbonize to 1000°C in the atmosphere, and then graphitize at 2200°C to obtain graphite material. The material has a flexural strength of 137 MPa and a density of 1.82 g / cm 3 , the degree of isotropy is 1.05, the silicon content is 1.3wt%, and the weight loss is 5.9wt% in air at 1200°C for 1 hour.

Embodiment 3

[0020] Take mesophase pellets with an average diameter of 20 μm, and the volatile content of the pellets is 12 wt%. Use silica sol with a solid content of 20% to impregnate the pellets under vacuum, dry the pellets at 120°C, put the pellets into a mold, press at 200MPa for 2 hours, and obtain a primary green body after demoulding. Carbonize to 1100°C in the atmosphere, and then graphitize at 2100°C to obtain graphite material. The material has a flexural strength of 122 MPa and a density of 1.71 g / cm 3 , the degree of isotropy is 1.07, the silicon content is 0.3wt%, and the weight loss is 11.3wt% in air at 1200°C for 1 hour.

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Abstract

The invention discloses a preparation method of a high-performance isotropic graphite material. The preparation method comprises the following steps: using silica sol as a silicon element precursor, using mesophase microbeads as a carbon precursor, and using internal micropores and surfaces of the mesophase microbeads as supporting parts of the silica sol; carrying out impregnating, drying, forming, roasting and graphitizing process to obtain a silicon-doped isotropic graphite material.

Description

technical field [0001] The invention relates to a preparation method of a high-performance isotropic graphite material. To be precise, the high-performance graphite material involved in the present invention is made of isotropic graphite material through a self-sintering process by adopting a method of silicon doping, using mesophase pellets as raw materials. [0002] technical background [0003] Graphite is a simple material composed of carbon elements, and its basic structure is the superposition of layered structures composed of carbon six-membered rings. The anisotropy of the graphite material is due to the difference in the carbon six-membered ring in the layer and the physical combination between the layers. Generally, the degree of isotropy of graphite products is greater than 1.1. Due to different applications, people have different requirements for graphite materials. In many cases, it is hoped that the anisotropy of graphite will be smaller, such as nuclear graphi...

Claims

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Application Information

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IPC IPC(8): C04B35/52
CPCC04B35/522C04B2235/3418C04B2235/77C04B2235/96
Inventor 史景利任美璇邓年伟艾芝泉马昌
Owner TIANJIN POLYTECHNIC UNIV
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