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Preparation method of isostatic pressing microcrystalline graphite product

A technology of microcrystalline graphite and isostatic pressing, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of high cost, long production process, high energy consumption, etc., and achieve sufficient raw materials, fine and compact structure, The effect of high degree of graphitization

Inactive Publication Date: 2014-09-03
HUNAN GUOSHENG GRAPHITE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the production of isostatic graphite mainly uses raw materials such as ultrafine secondary coke powder and mesophase carbon microspheres to obtain better isotropic properties. High temperature graphitization heat treatment leads to long production process, high energy consumption and high cost

Method used

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  • Preparation method of isostatic pressing microcrystalline graphite product
  • Preparation method of isostatic pressing microcrystalline graphite product
  • Preparation method of isostatic pressing microcrystalline graphite product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this example, the binder is modified coal tar pitch, and its main performance indicators are: softening point 103°C; toluene insoluble matter 28.6%; quinoline insoluble matter 9.0%; volatile matter 54.2%; coking value 55.7%;

[0039] The impregnating agent is medium temperature coal tar pitch and high temperature coal tar pitch, and its main performance indicators are as follows:

[0040] Medium temperature coal tar pitch: softening point 85°C; toluene insoluble matter 24.4%; quinoline insoluble matter 7.6%; volatile matter 58.3%; coking value 52.6%; high temperature coal tar pitch: softening point 112°C; toluene insoluble matter 30.2%; 8.4%; volatile matter 53.3%; coking value 56.9%;

[0041] Aggregate is microcrystalline graphite, artificial graphite and electric calcined pitch coke, and its main performance indicators are as follows:

[0042] Microcrystalline graphite: ash content 0.32%; sulfur content 0.05%; true density 2.22g / cm 3 ;Powder resistivity 120μΩ·m; ...

Embodiment 2

[0067] In this example, the binder is modified coal tar pitch, and its main performance indicators are: softening point 98°C; toluene insoluble matter 29.3%; quinoline insoluble matter 8.5%; volatile matter 54.8%; coking value 56.3%.

[0068] The impregnating agent is medium temperature coal tar pitch and high temperature coal tar pitch, and its main performance indicators are as follows:

[0069] Medium temperature coal tar pitch: softening point 80°C; toluene insoluble matter 22.7%; quinoline insoluble matter 6.8%; volatile matter 58.3%; coking value 53.1%;

[0070] High-temperature coal tar pitch: softening point 108°C; toluene insoluble matter 28.2%; quinoline insoluble matter 8.9%; volatile matter 54.1%; coking value 57.4%.

[0071] Aggregate is microcrystalline graphite, artificial graphite and electrocalcined pitch coke, and its main performance indicators are as follows:

[0072] Microcrystalline graphite: ash content 0.06%; sulfur content 0.03%; true density 2.24g / cm...

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Abstract

The invention relates to a preparation method of an isostatic pressing microcrystalline graphite product. The isostatic pressing microcrystalline graphite product comprises the following components by weight: 35-50% of microcrystalline graphite, 10-25% of artificial graphite, 10-25% of electrically calcined pitch coke and 30-40% of modified coal tar pitch. The isostatic pressing microcrystalline graphite product is obtained by the steps of pretreating raw material, burdening, kneading, rolling, fragmenting and pulverizing, preforming, performing isostatic compaction, roasting, dipping, performing heat treatment under high temperature and the like. The unique part in the method is the usage of the natural microcrystalline graphite as a main aggregate, the resource can be used in a reasonable mode, high temperature graphitization heat treatment at more than 2500 DEG C on the product is not required, so that preparation period can be shortened, and the energy consumption is greatly reduced. The prepared isostatic pressing microcrystalline graphite has the advantages of high volume density, mechanical strength, low resistivity, fine and compact structure, and isotropy.

Description

technical field [0001] The invention relates to the field of deep processing of microcrystalline graphite, in particular to a method for preparing isostatically pressed microcrystalline graphite products. technical background [0002] Isostatic graphite material has many excellent characteristics such as high volume density, high mechanical strength, good electrical and thermal conductivity, high temperature resistance, corrosion resistance and isotropy. Irreplaceable materials such as graphite electrodes are excellent materials for manufacturing rocket nozzles, nuclear reactor deceleration materials and reflective materials, and occupy an important position in the fields of cutting-edge industry and national defense technology. [0003] At present, the production of isostatic graphite mainly uses raw materials such as ultrafine secondary coke powder and mesophase carbon microspheres to obtain better isotropic properties. High temperature graphitization heat treatment leads...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/205
Inventor 林前锋
Owner HUNAN GUOSHENG GRAPHITE TECH CO LTD
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