Method for preparing isotropical graphite

An isotropic, graphite technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of poor formability, inability to suppress, weak sintering driving force, and easy sintering cracks, etc. Sintering performance, improving bulk density and mechanical strength, and good isotropy

Inactive Publication Date: 2013-04-03
KAIFENG CARBON CO LTD OF CHINA PINGMEI SHENMA GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, large-scale production has not been realized due to problems such as poor formability, unable to suppress large-scale products, and weak sintering driving force, which easily causes cracks during sintering.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing isotropic graphite, comprising the steps of:

[0030] ① Mix 100 g of mesophase carbon microspheres with an average particle size of 4.7 μm and 100 g of pitch (the softening point is 89.3°C, the content of quinoline insolubles is 0.6%, and the mass content of β resin is 15.7%) to obtain a mixture;

[0031] ② Thermal polymerization of the mixture at 400°C under the protection of nitrogen atmosphere for 4 hours to obtain the mesophase raw material;

[0032] ③ Ball milling the mesophase raw material to obtain ball milling powder with an average particle size of 7.9 μm;

[0033] ④ The ball mill powder was oxidized at 270°C in an air atmosphere for 1 hour to obtain the pretreated powder;

[0034] ⑤ Molding the pretreated powder by isostatic pressing, the molding pressure is 80MPa, the molding temperature is 25°C, and the molding time is 40 minutes;

[0035] ⑥Heat up to 1200°C for sintering, and hold for 40 hours;

[0036] ⑦Raise the temperature to 24...

Embodiment 2

[0039] A method for preparing isotropic graphite, comprising the steps of:

[0040] ① Mix 100g of mesophase carbon microspheres with an average particle size of 11.2μm and 100g of pitch (the softening point is 88.6°C, the content of quinoline insolubles is 0.4%, and the mass content of β resin is 16.3%) to obtain a mixture;

[0041] ② Thermal polymerization of the mixture at 400°C under the protection of nitrogen atmosphere for 4 hours to obtain the mesophase raw material;

[0042] ③ The mesophase raw material is ball milled to obtain a ball mill powder with an average particle size of 8.4 μm;

[0043] ④ The ball mill powder was oxidized at 270°C in an air atmosphere for 1 hour to obtain the pretreated powder;

[0044] ⑤ Molding the pretreated powder by isostatic pressing, the molding pressure is 80MPa, the molding temperature is 25°C, and the molding time is 40 minutes;

[0045] ⑥Heat up to 1200°C for sintering, and hold for 40 hours;

[0046] ⑦Raise the temperature to 240...

Embodiment 3

[0049] A method for preparing isotropic graphite, comprising the steps of:

[0050] ① Mix 100g of mesophase carbon microspheres with an average particle size of 4.7μm and 400g of pitch (the softening point is 89.3°C, the content of quinoline insolubles is 0.6%, and the mass content of β resin is 15.7%) to obtain a mixture;

[0051] ② Thermal polymerization of the mixture at 400°C under the protection of nitrogen atmosphere for 4 hours to obtain the mesophase raw material;

[0052] ③ The mesophase raw material is ball milled to obtain a ball mill powder with an average particle size of 7.7 μm;

[0053] ④ The ball mill powder was oxidized at 270°C in an air atmosphere for 1 hour to obtain the pretreated powder;

[0054] ⑤ Molding the pretreated powder by isostatic pressing, the molding pressure is 80MPa, the molding temperature is 25°C, and the molding time is 40 minutes;

[0055] ⑥Heat up to 1200°C for sintering, and hold for 40 hours;

[0056] ⑦Raise the temperature to 2400...

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Abstract

The invention discloses a method for preparing isotropical graphite, which is characterized by comprising the following steps: (1) mixing mesocarbon microbeads with asphalt to obtain a mixture; (2) carrying out thermal polymerization reaction to the mixture, and growing the mesocarbon microbeans for the second time to obtain intermediate phase raw material; (3) performing ball-milling treatment to the intermediate phase raw material to obtain ball-milled powder; (4) performing oxidization treatment to the ball-milled powder to obtain pre-treated powder; (5) performing iso-static compaction to the pre-treated powder; (6) sintering; and (7) graphitizing. The preparation method disclosed by the invention is short in process and easy to implement, and is beneficial for shortening the production cycle and reducing the manufacturing cost; in addition, the graphite material produced by the method disclosed by the invention has the characteristics of excellent homogeneity and high mechanical strength.

Description

technical field [0001] The invention relates to a method for preparing isotropic graphite. Background technique [0002] Isotropic graphite is a special graphite material with random orientation of graphite crystallites and isotropic structure. The anisotropy of its internal structure is generally between 1.0 and 1.1. Isotropic graphite has many excellent properties such as stable performance at high temperature, high density, high strength, and high thermal conductivity. It is widely used in semiconductors, photovoltaic solar energy, EDM, nuclear energy, metallurgy, aerospace and many other fields. With the development of science and technology, its application fields are still expanding. [0003] Traditional isotropic graphite mainly uses coke or graphite as aggregate and coal tar pitch as binder. After batching, kneading, rolling and grinding for many times, it is formed by molding or isostatic pressing, and then carbonized, impregnated and graphite. made by processing....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/205
Inventor 于嗣东郑建华杨旭谷小虎梁冉赵东锋杜爱芳程小可刘爱中李玉坡
Owner KAIFENG CARBON CO LTD OF CHINA PINGMEI SHENMA GRP
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