Carbon material with isotropic fine structure and preparation method for same

A technology of isotropic fine carbon materials, applied in chemical instruments and methods, carbon-silicon compound conductors, inorganic chemistry, etc., can solve the problems of long production cycle, high production cost, and difficult industrial production, and achieve excellent flexural strength and production The effect of short cycle and simple process

Active Publication Date: 2012-07-11
福建杉杉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome that the existing isotropic carbon material preparation method requires repeated impregnation and roasting treatments, long production cycle, high production cost, low yield, easy to produce cracks, and difficult to manufacture large carbon materials. Standard carbon products, difficult to realize industrial production and other defects, provide an isotropic fine structure carbon material and its preparation method and use

Method used

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  • Carbon material with isotropic fine structure and preparation method for same
  • Carbon material with isotropic fine structure and preparation method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] ①Powder coke (D 50 : 5μm) 360 grams (that is, the amount of 90wt%) and nano B 4 C(D 50 : 85nm) 40 grams are fully mixed with a mixer, it is mixed with 100 grams of ball material and then loaded into the ball mill, the ball mill speed is set at 30 rpm, and it runs for 24 hours to get the powder after ball milling;

[0030] ② Add 400 grams of ball-milled powder to 1600 grams of coal tar pitch (that is, the amount of 80 wt%) and react for 6 hours at 0.1 MPa and 425 ° C for thermal condensation reaction. The resulting product uses 3600 grams of coal tar at 240 ° C and 0.1 MPa Dissolved for 150 minutes, then liquid-solid separation, and the separated solid material was roasted at 300°C for 15 hours at a low temperature;

[0031] ③ Molding at 50MPa, holding pressure for 5 hours to obtain a billet, and hot isostatic pressing the billet at 1200°C and 60MPa for 10 hours;

[0032]④Raise the temperature to 2800°C, carry out graphitization treatment at constant temperature for 2...

Embodiment 2

[0034] ① Put artificial graphite powder (D 50 : 5μm) 360 grams (that is, the amount of 90wt%) and nano B 4 C(D 50 : 85nm) 40 grams are fully mixed with a mixer, it is mixed with 400 grams of ball material and then packed into the ball mill, the ball mill speed is set at 60 rpm, and it runs for 10 hours to get the powder after ball milling;

[0035] ②Powder (400 grams) after ball milling was added in 1600 grams of coal tar pitch (that is, consumption 80wt%) and reacted at 0.1MPa and 425°C for 6 hours to carry out thermal condensation reaction, and the resulting product was heated with 3,600 grams of coal tar at 240°C and 0.1 Dissolve at MPa for 150 minutes, then separate the liquid from the solid, and roast the separated solid material at 400°C for 10 hours at a low temperature;

[0036] ③ Molding at 75MPa, holding pressure for 2 hours to obtain a billet, and hot isostatic pressing the billet at 800°C and 100MPa for 5 hours;

[0037] ④Raise the temperature to 2300°C, hold th...

Embodiment 3

[0039] ① Put artificial graphite powder (D 50 : 5μm) 180 grams (that is, the amount of 45wt%), coke powder (D 50 : 5μm) 180 grams (that is, the amount of 45wt%) and nano B 4 C(D 50 : 85nm) 40 grams are fully mixed with a mixer, it is mixed with 400 grams of ball material and then loaded into the ball mill, the ball mill speed is set at 120 rpm, and it runs for 10 hours to get the powder after ball milling;

[0040] ②Powder (400 grams) after ball milling was added in 1600 grams of coal tar pitch (that is, consumption 80wt%) and reacted at 0.1MPa and 425°C for 6 hours to carry out thermal condensation reaction, and the resulting product was heated with 3,600 grams of coal tar at 240°C and 0.1 Dissolve at MPa for 150 minutes, then separate the liquid from the solid, and roast the separated solid material at 400°C for 10 hours at a low temperature;

[0041] ③ Molding at 75MPa, holding pressure for 2 hours to obtain a billet, and hot isostatic pressing the billet at 800°C and 10...

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Abstract

The invention provides a preparation method for a carbon material with an isotropic fine structure, comprising the following steps of: (1) performing ball-milling treatment on fine-grained powdery materials and nanopowder; (2) mixing with asphalt and then performing thermal polycondensation reaction, and roasting at a low temperature of 300-500 DEG C; (3) moulding by compression and then moulding by hot-isostatic pressing; and (4) performing graphitization treatment. The invention further provides a carbon material with an isotropic fine structure prepared by the method. The preparation method provided by the invention is simple in process, easy in implementation, without the need of repeated soaking and roasting, short in production cycle, high in the rate of finished products, not easy to generate cracks during graphitization, and capable of realizing industrialized production. The carbon material with an isotropic fine structure provided by the invention has excellent rupture strength, compression strength, volume density, porosity and resistivity, and can be produced into large-sized carbon blocks.

Description

technical field [0001] The invention relates to an isotropic fine-structure carbon material and a preparation method thereof. Background technique [0002] Isotropic carbon material is an important special carbon material, which is widely used in the mold industry, electric discharge machining and graphite crystallizer for metal continuous casting. Especially high-performance isotropic fine-structure carbon materials, due to their compact structure, good isotropy, strong high-temperature oxidation resistance, high mechanical strength, and wear resistance, they can be used as molds for continuous casting, medium and high-end EDM Electrodes of processing machine tools, high-temperature sintering molds, metal smelting crucibles, and aerospace engine seals and ablation-resistant components. [0003] Traditional isotropic carbon materials are mainly formed by adding binder pitch to coke or artificial graphite of different particle sizes, kneading, tableting, crushing, extruding,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B31/00H01B1/04C01B32/205
Inventor 李念民李心楠李杰谢秋生
Owner 福建杉杉科技有限公司
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