Method for preparing isotropic graphite from isotropic asphalt with high softening point through self-sintering

A technology for isotropic and graphite materials, which is applied in the field of preparing isotropic graphite materials with isotropic asphalt with high softening point, can solve the problems of reduced graphite performance, easy generation of voids, and easy cracking of products, and achieves stable product quality and various Good isotropy and high density

Inactive Publication Date: 2016-06-08
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In "Self-sintering preparation of carbonized tantalum-carbon composite materials (application number: 200510012585.X)", Liu Lang and others used pitch with a high softening point to prepare carbon composite materials through self-sintering. The pitch was not treated in any way, but due to the The distribution of medium molecular weight is wide, and there are many small molecular weight components. When volatilizing, it is easy to generate voids and form defects, thereby reducing the performance of graphite, and the escape of light components makes the product easy to crack.

Method used

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  • Method for preparing isotropic graphite from isotropic asphalt with high softening point through self-sintering
  • Method for preparing isotropic graphite from isotropic asphalt with high softening point through self-sintering

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Embodiment 1

[0020] The high softening point isotropic pitch with a softening point of 200°C was crushed to 30 μm, raised to 200°C in air at 2°C / min, and the non-melting time at 200°C was 15 hours for "moderate" non-melting to obtain Powdered primary raw material. The above-mentioned powdery primary raw materials are molded, and then carbonized at 800°C under normal pressure and inert atmosphere protection, and kept at a constant temperature for 1 hour to obtain a carbon product; graphitization is carried out at 2800°C under normal pressure and inert atmosphere protection to obtain Target product; the product has a flexural strength of 52MPa, a compressive strength of 115MPa, and a bulk density of 1.78g / cm 3 , the degree of isotropy is 1.06.

Embodiment 2

[0022] The high softening point isotropic asphalt with a softening point of 220°C is crushed to 20 μm, raised to 250°C at 2°C / min in air, and the non-melting time at 250°C is 12 hours, and "moderate" non-melting is carried out to obtain Powdered primary raw material. The above-mentioned powdery primary raw materials are formed by vibration, and then carbonized at 1000°C under normal pressure and inert atmosphere protection, and kept at constant temperature for 1 hour to obtain a carbon product; graphitization is carried out at 2600°C under normal pressure and inert atmosphere protection to obtain Target product; the product has a flexural strength of 68MPa, a compressive strength of 145MPa, and a bulk density of 1.76g / cm 3 , the degree of isotropy is 1.05.

Embodiment 3

[0024] The high-softening-point isotropic asphalt with a softening point of 250°C was crushed to 15 μm, raised to 300°C at 2°C / min in air, and the non-melting time at 300°C was 10 hours for "moderate" non-melting to obtain Powdered primary raw material. The above-mentioned powdery primary raw materials are formed by vibration, and then carbonized at 900°C under normal pressure and inert atmosphere protection, and kept at constant temperature for 1 hour to obtain carbon products; graphitization is carried out at 2400°C under normal pressure and inert atmosphere protection to obtain Target product; the product has a flexural strength of 112MPa, a compressive strength of 237MPa, and a bulk density of 1.79g / cm 3 , the degree of isotropy is 1.04.

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Abstract

The invention discloses a method for preparing isotropic graphite from isotropic asphalt with a high softening point through self-sintering. According to the method, isotropic asphalt with a softening point of 200 to 330 DEG C is taken as the raw material, then isotropic asphalt is grinded into particles with a particle size of 5 to 30 [mu]m; the particles are oxidized in the air for 1.5 to 15 hours at a temperature of 200 to 400 DEG C to reach a proper non-melt degree so as to obtain a primary raw material; and then the primary raw material is moulded, carbonized, and graphitized to obtain the graphite having advantages of high strength, high density, and good isotropic property. The preparation method is simple, and the prepared graphite has a good isotropic property.

Description

Technical field: [0001] The invention relates to a method for preparing isotropic graphite material from isotropic pitch with high softening point. Background technique [0002] The graphite crystal structure is a macroscopic material stacked by a planar structure composed of six-membered carbon rings, and its properties in the plane direction and perpendicular to the plane direction are relatively different, which is the so-called "anisotropy". Graphite produced in general industry is anisotropic, and many special occasions require "isotropy" for graphite materials. Therefore, the preparation of isotropic graphite has become an important aspect of high-performance graphite. [0003] High-strength and high-density isotropic graphite materials are mainly used in semiconductor industries such as crucibles, metal industries such as casting molds, high-power electrodes for electrical discharge machining, graphite for nuclear industry, military, aerospace and other cutting-edge f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/52C04B35/622
CPCC04B35/522C04B35/524C04B35/622C04B2235/658C04B2235/77C04B2235/96
Inventor 史景利张海霞李正一曹二闯徐建康李晓杰马昌
Owner TIANJIN POLYTECHNIC UNIV
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