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Oversized isostatic pressing graphite and production method thereof

An ultra-large size, isostatic pressing technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the difficulties in ensuring the yield and quality of super-sized isostatic graphite materials, user troubles, and volume density Inhomogeneity problems, to achieve the effect of reduced thermal expansion coefficient, excellent isotropy, and high thermal conductivity

Inactive Publication Date: 2013-03-06
CHENGDU CARBON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The uneven density of the product will bring great difficulties to heat treatment processes such as roasting and graphitization. At the same time, the uneven volume density of the product will bring great troubles to users, and even cause accidents during use.
Therefore, the usual isostatic graphite process is difficult to guarantee the yield and quality of super-sized isostatic graphite materials

Method used

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  • Oversized isostatic pressing graphite and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The production specifications of this embodiment are Φ810×730mm isostatic graphite manufacturing raw materials and production methods are as follows:

[0028] A. Take raw materials according to the following weight ratio: 40 parts of pitch coke powder; 50 parts of needle coke powder; 10 parts of graphite powder; 15 parts of mesophase spheres; 45 parts of coal tar pitch; 2 parts of surfactant; modifier 1 copy;

[0029] B. Grind pitch coke powder and needle coke powder separately so that the particle size is not greater than 15 μm;

[0030] C. Grinding the graphite powder and mesophase spheres separately to make the particle size 1-10 μm;

[0031] D. Mix the powders prepared in steps B and C, and add other raw materials in step A for kneading;

[0032] E. Grinding the product obtained in step D after cooling so that the particle size is not greater than 15 μm;

[0033] F, put the powder obtained in step E into the mold for vibration molding, the density of vibration mo...

Embodiment 2

[0040] The production specifications of this embodiment are Φ810×730mm isostatic graphite manufacturing raw materials and production methods are as follows:

[0041] Take raw materials according to the following weight ratio: 35 parts of pitch coke powder; 55 parts of needle coke powder; 5 parts of graphite powder; 10 parts of mesophase spheres; 40 parts of coal tar pitch; 2 parts of surfactant; 1 part of modifier ;

[0042] The other production steps were as described in Example 1, B-J of the production steps.

[0043] The product obtained after graphitization is the final product.

[0044] Table 1 lists the physical and chemical indicators of the isostatic graphite produced in the examples of the present invention.

[0045] Table 1: Physical and chemical indicators of isostatic graphite in the embodiments of the present invention

[0046]

[0047] The present invention adopts ultra-fine particles, unique formula and vibration molding-isostatic pressing molding method, ...

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Abstract

The invention discloses oversized isostatic pressing graphite and a production method thereof. The following raw materials are taken by weight part: 35-60 parts of pitch coke powder, 30-55 parts of needle coke powder, 5-20 parts of graphite powder, 10-20 parts of intermediate-phase small spheres, 30-50 parts of coal pitch, 1-3 parts of surface active agents and 1-3 parts of modifying agents. The raw materials are subjected to grinding, mixing and pinching, vibration molding, isostatic pressing molding, roasting, dipping, secondary roasting and graphitizing, so that the oversized isostatic pressing graphite is obtained. A once raw material treating and molding method is adopted by the invention; compared with a method of secondarily coking raw materials adopted in China at present, the production method has the advantages of short manufacturing cycle, low energy consumption, and the like; the isostatic pressing graphite product in the size being above phi 700*700mm produced according to the production method has excellent isotropy, high volume density, high mechanical strength and high heat conductivity; the resistivity and the coefficient of thermal expansion are reduced; and a design thought is excellently reflected.

Description

technical field [0001] The invention belongs to the field of graphite production, in particular to a super-sized isostatic graphite and a production method thereof. Background technique [0002] The isostatic graphite material is usually a cylindrical material or a cuboid material due to the molding method. Because the production process of isostatic graphite is a repeated impregnation-roasting process, the volume density of the cylindrical material or cuboid material will be uneven, close to the product The bulk density is high at the surface and low near the core. The uneven density of the product will bring great difficulties to heat treatment processes such as roasting and graphitization. At the same time, the uneven volume density of the product will bring great troubles to users, and even cause accidents during use. . Therefore, the usual isostatic graphite process is difficult to guarantee the yield and quality of super-sized isostatic graphite materials. [0003] ...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/205
Inventor 冯惺
Owner CHENGDU CARBON
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