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A kind of preparation method of high-density and high-strength isotropic graphite with short process

An isotropic, short-process technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of long product production cycle, poor blank homogeneity, low isotropy, etc., to reduce impregnation- Carbonization repeated cycle, low production cost, high isotropy effect

Active Publication Date: 2020-10-02
CHENGDU CARBON
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  • Abstract
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  • Application Information

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Problems solved by technology

The traditional isostatic graphite production method is to knead petroleum coke, pitch coke or other carbon raw materials and coal tar pitch through kneading, roasting, dipping and roasting for many times, and finally graphitization. The product production cycle is long, the yield is low, and the index is low. , high cost, poor homogeneity of billet, low isotropy

Method used

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  • A kind of preparation method of high-density and high-strength isotropic graphite with short process
  • A kind of preparation method of high-density and high-strength isotropic graphite with short process

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preparation example Construction

[0026] The preparation method of a kind of short-process high-density high-strength isotropic graphite of the present invention comprises the following steps:

[0027] (1) Low-quinoline high-temperature coal tar pitch is heat-treated in a closed reactor in vacuum at low temperature to obtain a mesophase pitch coke precursor;

[0028] (2) Mechanically pulverize the mesophase pitch coke precursor to make powder A with an average particle size of 10-25 μm;

[0029] (3) Pretreat coal tar pitch mesocarbon microspheres with an average particle size of 10-25 μm in a vacuum drying oven for a certain period of time to obtain powder B;

[0030] (4) Mix powder A and powder B according to a certain ratio, and mix them under mechanical pressure to obtain pressed powder;

[0031] (5) Put the prepared compressed powder into a rubber mold, let it stand for 0.5h to pressurize and exhaust, seal and vacuumize, and then make a green body by isostatic pressing, with a molding pressure of 100-150M...

Embodiment 1

[0042] The solid low-quinoline high-temperature coal tar pitch is crushed to less than 5 mm, and put into a closed reaction kettle for vacuum low-temperature heat treatment to obtain a mesophase pitch coke precursor. The mesophase pitch coke precursor was crushed, and the average particle size was controlled to 20 μm to obtain powder A. Coal tar pitch mesocarbon microspheres with an average particle size of 20 μm were vacuum-dried at 120° C. for 2 hours to obtain powder B. Weigh powder A and powder B according to the mass ratio of 1:9, pressurize and mix the prepared mixture to obtain compressed powder, put the prepared compressed powder into a rubber mold, and let it stand for 0.5h Pressurize and exhaust, seal and evacuate, and then press 130MPa to obtain a green body. Then put the green body into a stainless steel crucible with a bottom and no cover. The bottom and sides are filled with fine graphite powder, and the top is covered. Fine coke powder is used as insulation mat...

Embodiment 2

[0044]The solid low-quinoline high-temperature coal tar pitch is crushed to less than 5 mm, and put into a closed reaction kettle for vacuum low-temperature heat treatment to obtain a mesophase pitch coke precursor. The mesophase pitch coke precursor was crushed, and the average particle size was controlled to 20 μm to obtain powder A. Coal tar pitch mesocarbon microspheres with an average particle size of 20 μm were dried under vacuum at 200°C for 4 hours to obtain powder B. Weigh powder A and powder B according to the mass ratio of 2:8, pressurize and mix the prepared mixture to obtain compressed powder, put the prepared compressed powder into a rubber mold, and let it stand for 0.5h Pressurize and exhaust, seal and evacuate, and then undergo isostatic pressing at 140MPa to obtain a green body. Then put the green body into a stainless steel crucible with a bottom and no cover. The bottom and sides are filled with fine graphite powder, and the top is covered. Fine coke powde...

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Abstract

The invention discloses a preparation method of short-flow high-density high-strength isotropic graphite. The preparation method includes the steps of subjecting low-quinoline high-temperature coal pitch to vacuum low-temperature heat treatment in a closed reaction kettle, and mechanically pulverizing the coal pitch into powder A with the average particle size of 10-25 micrometers; pretreating coal pitch mesocarbon microbeads with the average particle size of 10-25 micrometers in a vacuum drying oven for a certain period of time to obtain powder B; blending the powder A with the powder B according to a certain ratio, and performing mechanical pressurizing and mixing to obtain pressed powder; putting the pressed powder into a rubber mold, performing standing for 0.5 hour for pressurized exhausting, sealing and vacuumizing, and performing isostatic compaction to obtain a green body; putting the green body in a stainless steel lid-free crucible with a bottom, adding fillers, putting the stainless steel crucible loaded with the green body into a carbonization furnace, slowly increasing the temperature by 1-10 DEG C each time to 1,100 DEG C, and preserving the heat at 1,100 DEG C for 5-8 hours, naturally cooling the stainless steel crucible to the room temperature, and taking out the carbonized blank material; graphitizing the carbonized blank material at the temperature higher than2,600 DEG C, and performing natural cooling to complete the preparation of the short-flow high-density high-strength isotropic graphite.

Description

technical field [0001] The invention relates to the technical field of graphite products, in particular to a short-flow, high-density, high-strength isotropic graphite preparation method. Background technique [0002] High-density and high-strength isotropic graphite, also known as high-density and high-strength isostatic graphite, is a new material with high performance, multi-purpose and high added value. It has been widely used in solar photovoltaic, metallurgy, semiconductor, EDM, chemical industry, atomic energy, aerospace High-tech fields such as military industry. With the competitive development of various industries, the demand for the quality of graphite materials is getting higher and higher. Only high-quality and low-cost isotropic graphite can remain invincible in the market competition. Isotropic graphite manufacturers at home and abroad are developing low-cost, short-process, high-performance high-density and high-strength isotropic graphite. The traditional...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/205
CPCC01B32/205
Inventor 赵世贵杨波邓江龙
Owner CHENGDU CARBON
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