Preparation method of isostatic pressing formed graphite of ultra-thin structure

A technology of isostatic pressing and fine structure, applied in the field of static pressing graphite, can solve the problems of harsh production environment, poor product homogeneity, long production cycle, etc. low effect

Inactive Publication Date: 2015-12-23
CHENGDU CARBON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production cost of this process is high, the production cycle is long, the product homogeneity is poor, and the production environment in the rolling process is extremely harsh

Method used

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  • Preparation method of isostatic pressing formed graphite of ultra-thin structure
  • Preparation method of isostatic pressing formed graphite of ultra-thin structure

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preparation example Construction

[0025] Such as figure 1 Shown, a kind of preparation method of ultrafine structure isostatic graphite, comprises following multiple steps:

[0026] S1: The calcined petroleum coke or pitch coke is roughly crushed to 1mm or less by a hammer crusher, and then crushed by a jet mill into 5-10μm coke powder as aggregate;

[0027] S2: Preheat the coke powder used as aggregate to 100-150°C, and then mix it with the binder coal tar pitch at an ambient temperature of 150-180°C for 1-3 hours, and pass it through a hammer crusher after natural cooling Crushed to less than 3mm, and then mechanically milled to obtain compressed powder less than 60μm;

[0028] S3: Put the compressed powder into a rubber mold, seal it and perform isostatic pressing under a pressure of 100-140MPa to form a green body;

[0029] S4: heating the green body to 950-1150°C at a heating rate of 1-5°C / h to obtain a carbon body;

[0030] S5: impregnating the carbon body, the impregnation temperature is 260-350°C, t...

Embodiment 1

[0037] ① First, crush the petroleum coke calcined at 1300℃ to 1mm or less with a hammer crusher;

[0038] ②Use a jet mill to grind to 10 μm to obtain aggregate coke powder, preheat the coke powder to 110°C, and then knead strongly at 160°C for 1.5 hours with the binder coal tar pitch whose softening point is 92°C and has a coking value of 48%. Among them, the aggregate coke powder content is 72%, and the binder pitch content is 28%. After the mixture is cooled, it is crushed with a hammer crusher to less than 3mm, and then mechanically ground to obtain pressed powder;

[0039] ③Put the pressed powder into the rubber mold sleeve to seal, and isostatically press under 110MPa pressure to make a green body;

[0040] ④Heating the formed green body to 950°C at a heating rate of 5°C / h to obtain a carbon body;

[0041] ⑤Impregnate the carbon body. The impregnating agent is low-quinoline medium-temperature coal tar pitch, the impregnating temperature is 280°C, the impregnating pressur...

Embodiment 2

[0045] ① First, crush the pitch coke calcined at 1300℃ to 1mm or below with a hammer crusher;

[0046] ②Use a jet mill to grind to 8 μm to obtain aggregate coke powder. Preheat the coke powder to 120°C with a softening point of 101°C and a binder coal tar pitch with a coking value of 54% at 170°C for 2 hours. Among them, The coke powder content of the aggregate is 69%, the binder pitch content is 31%, after the mixture is cooled, it is crushed with a hammer crusher to less than 3mm, and then pressed powder is obtained by mechanical grinding;

[0047]③Put the pressed powder into the rubber mold sleeve to seal, and isostatically press under 120MPa pressure to make a green body;

[0048] ④Heating the formed green body to 1050°C at a heating rate of 3°C / h to obtain a carbon body;

[0049] ⑤Impregnate the carbon body. The impregnating agent is low-quinoline medium-temperature coal tar pitch, the impregnating temperature is 300°C, the impregnating pressure is 2.0MPa, and the impreg...

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Abstract

The invention discloses a preparation method of isostatic pressing formed graphite of an ultra-thin structure. The preparation method includes the steps that calcined petroleum coke or pitch coke is crushed to be smaller or equal to 1 mm, smashed to be within the range of 5 micrometers-10 micrometers and preheated to 100-150 DEG C, then brute-force mixing kneading, cooling, crushing and secondary powder grinding are performed on the calcined petroleum coke or pitch coke and liquid-state molten pitch, and heat treatment is performed on a green body obtained through isostatic pressing forming to obtain a carbon green body; immersion treatment is performed on the carbon green body through low-quinoline intermediate-temperature coat tar pitch, then the carbon green body is heated to 1000-1200 DEG C at 5-10 DEG C / h, and finally the isostatic pressing formed graphite of the ultra-thin structure is obtained through graphitization treatment. The prepared isostatic pressing formed graphite of the ultra-thin structure has the advantages of being compact in structure, good in evenness, high in mechanical strength and isotropy, low in production cost, short in production period and the like.

Description

technical field [0001] The invention relates to the field of preparation of graphite products, in particular to a preparation method of ultrafine structure isostatic graphite. Background technique [0002] Ultra-fine structure isostatic graphite is a new type of graphite material developed in the middle and late twentieth century. It has a series of excellent properties. For example, ultra-fine structure isostatic graphite has good heat resistance. Under an inert atmosphere, with As the temperature increases, its mechanical strength does not decrease but increases, reaching the highest value at around 2500 °C; compared with ordinary graphite, isostatic graphite with ultra-fine structure has a fine and dense structure and good uniformity, and is widely used in metal continuous casting graphite Crystallizer industry; high isotropy; strong chemical corrosion resistance, can withstand the penetration and erosion of molten metal and glass, can be used as a high-temperature corros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 赵世贵雍龙海陈磊高银严永梅
Owner CHENGDU CARBON
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