Isotropic graphite material and manufacturing method thereof

A graphite material and iso-directional technology, applied in the field of directional graphite materials and their manufacturing, can solve the problems of cracks, cracks, and long processing time on the surface of graphite materials, so as to shorten the processing time, improve crack defects, and improve isotropic effect

Active Publication Date: 2015-10-28
CHINA STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, it is known that the processing time of the isotropic graphite material is long and energy-consuming, and the surface of the obtained graphite material is prone to cracks or even cracks, which limits its application range
[0006] Therefore, need to provide a kind of manufacturing method of isotropic graphite material badly, to thoroughly solve the graphite material surface that the known process gains has crack or defect, and limit the problems such as the scope of its application

Method used

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  • Isotropic graphite material and manufacturing method thereof
  • Isotropic graphite material and manufacturing method thereof
  • Isotropic graphite material and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to Embodiment 4

[0046] Embodiment 1 to embodiment 4 use mesocarbon microsphere B as raw material, wherein the basic information of mesocarbon microsphere B is listed in Table 1 (its TI is 99.4%, QI is 98.9%, average particle diameter (D 50 ) is 21 μm; Sinosteel Carbon Chemical Co., Ltd.).

[0047] About 55 grams of the above-mentioned mesocarbon microspheres B without pretreatment are filled in a cylindrical rubber mold (mold wall thickness 1.0 mm) with an inner diameter of about 25 mm, wherein the filling height of the mesocarbon microspheres in the mold is It is about 140mm. After compacting with a homogeneous rubber cover on the mold cover, carry out simple packaging (for example, use electrical tape to wrap it tightly) to avoid contamination caused by pressurized liquid intruding into the mold inadvertently during the cold equalization operation.

[0048] The above-mentioned mold containing mesophase carbon microspheres is placed in a cold isostatic pressure equipment (CL4.5-22-30, Nikki...

Embodiment 5

[0052] Embodiment 5 uses mesocarbon microsphere G as raw material, wherein the basic information of mesocarbon microsphere G is listed in Table 1 (its TI is 99.0%, QI is 98.6%, average particle diameter (D 50 ) is 24 μm; China Steel Carbon Chemical Co., Ltd.).

[0053] Under the protection of nitrogen gas, the mesophase carbon microspheres G were placed in the temperature range of 200° C. to 500° C. for 6 hours of heat treatment. Thereafter, it was pulverized using an air-induced pulverization equipment (ALG-2, Lingguang Industrial Co., Taiwan). After that, the particle size analyzer (Multisizer TM 3. Beckman Coulter, Inc., U.S.A.) analyzed the pulverized powder material of mesocarbon microspheres, the average particle size (D 50 ) is about 7 μm.

[0054] Next, about 860 grams of the above-mentioned pretreated powder were filled in a cylindrical rubber mold with an inner diameter of 100 mm (mold wall thickness 4.0 mm), and the filling height of the pulverized powder in the ...

Embodiment 6

[0060] Embodiment 6 uses mesophase carbon microspheres M as raw material, wherein the basic information of mesocarbon microspheres M is listed in Table 1 (its TI is 96.9%, QI is 95.0%, average particle diameter (D 50 ) is 24 μm; China Steel Carbon Chemical Co., Ltd.).

[0061] Mesocarbon microspheres M were pulverized using an air-induced pulverizing device (the same as that used in Example 5) before use; the particle size analyzer (same as that used in Example 5) was used to analyze the mesocarbon microspheres through Average particle size after pulverization (D 50 ) is about 5 μm.

[0062] Next, about 250 grams of the above-mentioned pretreated powder was filled in a cylindrical rubber mold with an inner diameter of 71 mm (mold wall thickness 1.0 mm), and the filling height of the pulverized powder in the mold was about 118 mm.

[0063] The above-mentioned mold filled with mesophase carbon microspheres pretreated by crushing is placed in a cold equal pressure equipment (CL...

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Abstract

The invention discloses an isotropic graphite material and a manufacturing method. Intermediate-phase carbon microspheres subjected or not subjected to pre-treatment, is moulded into green pressing through cold isostatic pressing and subjected to multi-step carbonation to effectively shorten processing time and obtain isotropic graphite material with excellent isotropic properties, intact and flawless surface and excellent mechanical, thermal and electric properties.

Description

technical field [0001] The present invention relates to an isotropic graphite material and a manufacturing method thereof, and in particular to an isotropic graphite material utilizing mesocarbon microspheres without adding any binder and a manufacturing method thereof. Background technique [0002] Graphite materials are composed of carbon elements. Through different manufacturing methods, unique carbon materials with different characteristics such as amorphous carbon, graphite-based carbon, pyrolytic carbon, and carbon fiber can be obtained. Among them, isotropic graphite (isotropic graphite) material has properties such as high temperature resistance, electrical conductivity, thermal conductivity, lubrication, porosity, plasticity and corrosion resistance, and has been widely used in various industries such as metallurgy, machinery and semiconductors recently. The traditional graphite manufacturing process generally uses coke as a raw material, mixed with coal tar pitch, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04C01B32/205
Inventor 廖福森许仁勇曾信雄黄全宏
Owner CHINA STEEL
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