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Preparation method of microstructure graphite

A microstructure, graphite technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of mutual agglomeration of particles, increase the difficulty of large-scale samples, etc., to achieve simple process, easy large-scale mass production, Avoid the effects of agglomeration and uneven dispersion

Active Publication Date: 2017-10-20
FIVE STAR NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that it is effective to control the pore properties and microstructure of graphite materials through the change of aggregate particle size and particle size distribution. However, the smaller the aggregate particle size, the larger the specific surface area and surface energy of the particles, which is easy to cause The particles are agglomerated with each other; and the more amount of binder required to achieve a uniform coating structure increases the difficulty of preparing large-scale samples

Method used

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  • Preparation method of microstructure graphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) The binder selects coal tar pitch (accounting for 30% by weight of the raw material) with a softening point of 140°C, 55wt% carbon residue, 20wt% volatile matter, and 0.1% ash content, crushing it and making the average particle size 50 μm and tetrahydrofuran solvent (mass ratio 1:2) at 50°C, fully stirred for 60 minutes to obtain a uniform suspension; (2) Calcined pitch coke with an average particle size of 8 μm was used as aggregate carbon (accounting for the weight of raw materials The percentage is 70%), put it into the kneader, when the temperature of the pitch coke reaches 50°C, put the above suspension into the kneader for liquid phase mixing for 3 hours, then raise the temperature to above 80°C for 3 hours, and evaporate the solvent to dryness The paste is obtained; the paste is crushed to an average particle size of 15 μm to obtain compressed powder; (3) the compressed powder is packed into a rubber mold cover to form by isostatic pressing, and the molding p...

Embodiment 2

[0023] (1) The binder is coal tar pitch (accounting for 40% by weight of the raw material) with a softening point of 270°C, 85wt% carbon residue, 60wt% volatile matter, and 0.01% ash content, crush it and make the average particle size 30 μm and quinoline solvent (mass ratio 1:3) at 80°C, fully stirred for 40 minutes to obtain a uniform suspension; (2) Calcined pitch coke with an average particle size of 5 μm was used as aggregate carbon (accounting for raw material The weight percentage is 60%), put it into the kneader, when the pitch coke temperature reaches 80°C, put the above suspension into the kneader for liquid phase mixing for 2 hours, then raise the temperature to above 240°C for 2 hours, and evaporate the solvent to dryness Prepare the paste; the paste is crushed to an average particle size of 8 μm to obtain pressed powder; (3) put the pressed powder into a rubber mold to form it by isostatic pressing, control the forming pressure to 200 MPa, hold the pressure for 20 ...

Embodiment 3

[0025] (1) The binder selects coal tar pitch (accounting for 34% by weight of the raw material) with a softening point of 210°C, 61wt% carbon residue, 25wt% volatile matter, and 0.08% ash content, crushing it and making the average particle size 20 μm and pyridine solvent (mass ratio 1:2) at 50°C, fully stirred for 30 minutes to obtain a uniform suspension; (2) Calcined pitch coke with an average particle size of 5 μm was used as aggregate carbon (accounting for the weight of raw materials The percentage is 66%), put it into the kneader, when the pitch coke temperature reaches 50°C, put the above suspension into the kneader for liquid phase mixing for 1 hour, then raise the temperature to above 120°C for 1 hour, and evaporate to dryness. The paste is obtained; the paste is crushed to an average particle size of 30 μm to obtain compressed powder; (3) the compressed powder is packed into a rubber mold cover to form by isostatic pressing, and the molding pressure is controlled to ...

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Abstract

The invention relates to a preparation method of microstructure graphite. The preparation method comprises the following steps: adopting superfine particle pitch cokes as aggregates and high-softening point asphalt as a bonding agent, preparing a paste material in a manner of liquid phase dispersion mixing and crushing to prepare pressed powder; preparing isotropic graphite with compact microstructure and small pore size distribution through isostatic press molding, carbonization, impregnation and high-temperature graphitization. The preparation method provided by the invention has the advantages that with the adoption of a raw material uniform blending process, on one hand, interfacial bonding of aggregate carbon and bonding agent bitumen is improved, and on the other hand, the agglomeration and non-uniform dispersion of the superfine particle isostatic pressure graphite are avoided, so that the possibility of occurrence of heat treatment cracking phenomenon is greatly reduced, and a favorable technical support is provided for the preparation of the superfine particle isostatic pressure graphite with large size. Moreover, the preparation method is wide in raw material source, lower in cost, simple in process and easy for large-scale batch production.

Description

technical field [0001] The invention relates to a preparation method of fine-structured graphite. Background technique [0002] The increasing shortage of energy and the excessive consumption of fossil fuels make the development of nuclear energy imperative. Materials are one of the key factors in nuclear reactor construction. Graphite, as the main core neutron moderator material, has high purity, high density, high strength, high thermal conductivity, low thermal expansion coefficient, excellent isotropy and radiation stability ; In addition, graphite has excellent high-temperature mechanical properties and is the only core structural material that can be used when the reactor coolant temperature exceeds 700 °C. Molten salt reactors are different from high-temperature gas-cooled reactors. In the molten salt reactor, the core moderator graphite is in direct contact with the high-temperature molten salt. Under the action of capillary or external pressure, the liquid molten s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205
Inventor 刘占军赵红超连鹏飞张俊鹏李国栋陶则超雷世文郭全贵
Owner FIVE STAR NEW MATERIAL TECH CO LTD
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