Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of preparation method and application of isotropic graphite material

An isotropic and graphite technology, applied in the petroleum industry, lubricating compositions, additives, etc., can solve the problems of high performance requirements of self-sintering powders, increased manufacturing costs, and large shrinkage of products, achieving excellent compatibility and low cost. The effect of reducing and the excellent performance of the finished product

Active Publication Date: 2021-12-24
HUNAN UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this production method has high requirements on the performance of the self-sintering powder, and usually requires modification of the powder, which increases the manufacturing cost and complicates the process
In addition, in actual production, it is also found that due to the large shrinkage rate of the product, it is easy to produce cracks and the problem of low yield

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method and application of isotropic graphite material
  • A kind of preparation method and application of isotropic graphite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of isotropic graphite material, comprising the following steps:

[0028] (1) Select pyrolytic carbon spheres with a particle size between 500-800nm, the same batch of samples and uniform particle size; then ultrasonically mix the pyrolytic carbon spheres with concentrated nitric acid with a mass concentration of 68%, and then stir at a constant temperature of 80°C Heating for 12h, then in N 2 In the atmosphere, the temperature was raised to 800°C at a heating rate of 10°C / min to obtain isotropic pyrolytic carbon powder;

[0029] (2) Ball mill and crush the mesophase pitch, pass through a 100-mesh sieve to obtain mesophase pitch powder, and then mix the mesophase pitch powder with the isotropic pyrolytic carbon powder obtained in the above step (1) in a mass ratio of 1:1 After mixing evenly, press into tablets, and then in N 2 Heating to 400°C at a heating rate of 5°C / min in the atmosphere and keeping it warm for 2 hours to obtain isotropic pyrolyt...

Embodiment 2

[0035] A preparation method of isotropic graphite material, comprising the following steps:

[0036] (1) Select pyrolytic carbon spheres with a particle size between 500-800nm, the same batch of samples and uniform particle size; then ultrasonically mix the pyrolytic carbon spheres with concentrated sulfuric acid with a mass concentration of 68%, and then stir at a constant temperature of 90°C Heating for 12h, then in N 2 In the atmosphere, the temperature was raised to 900°C at a heating rate of 20°C / min to obtain isotropic pyrolytic carbon powder;

[0037] (2) Ball mill and crush the mesophase pitch, pass through a 100-mesh sieve to obtain mesophase pitch powder, and then mix the mesophase pitch powder with the isotropic pyrolytic carbon powder obtained in the above step (1) at a mass ratio of 1:1.5 After mixing evenly, press into tablets, and then in N 2 Heating to 420°C at a heating rate of 5°C / min in the atmosphere and keeping it warm for 2 hours to obtain isotropic pyr...

Embodiment 3

[0043] A preparation method of isotropic graphite material, comprising the following steps:

[0044] (1) Select pyrolytic carbon spheres with a particle size between 500-800nm, the same batch of samples and uniform particle size; then mix pyrolytic carbon spheres with mixed acid (concentrated sulfuric acid with a mass concentration of 68% and Concentrated nitric acid) ultrasonically mixed evenly, then stirred and heated at a constant temperature of 90°C for 12h, and then heated in N 2 In the atmosphere, the temperature was raised to 900°C at a heating rate of 30°C / min to obtain isotropic pyrolytic carbon powder;

[0045] (2) Ball mill and crush the mesophase pitch, pass through a 100-mesh sieve to obtain mesophase pitch powder, and then mix the mesophase pitch powder with the isotropic pyrolytic carbon powder obtained in the above step (1) in a mass ratio of 1:1 After mixing evenly, press into tablets, and then in N 2 Heating to 420°C at a heating rate of 5°C / min in the atmo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of graphite materials, in particular to a preparation method and application of an isotropic graphite material. The method for preparing isotropic graphite material provided by the present invention adopts isotropic pyrolytic carbon powder as a raw material, uniformly mixes the raw material and binder according to a certain ratio, heats and extracts the binder, and then molds and forms a compact , carbonization and graphitization processes to produce isotropic graphite products. The present invention utilizes isotropic pyrolytic carbon with high degree of isotropy, high graphite degree and high degree of crystal structure order as the raw material of isotropic graphite, the preparation process is simple, the cycle is short, and the structure of the prepared graphite product is homogeneous and single , good isotropy, the product shrinks evenly, and is not easy to crack, which can meet the application of nuclear industry and high-end anti-friction materials.

Description

technical field [0001] The invention relates to the technical field of graphite materials, in particular to a preparation method and application of an isotropic graphite material. Background technique [0002] Isotropic graphite has excellent electrical and thermal conductivity, high mechanical strength, low thermal expansion coefficient, high temperature resistance, and thermal stability. It is widely used in national pillar industries such as metallurgy, chemical industry, electronics, and nuclear industry. Especially in the fields of military industry, aerospace, semiconductor materials, nuclear graphite for high temperature gas-cooled reactors and ultra-high power electrodes, isotropic graphite also occupies an important position. [0003] At present, the methods of producing isotropic graphite are mainly divided into traditional method and self-sintering method. The traditional method is to grind raw material coke such as petroleum coke, pitch coke or anthracite into f...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/532C04B35/622C04B35/628C10M125/02C10N30/06
CPCC04B35/522C04B35/532C04B35/622C04B35/62802C10M125/02C04B2235/77C04B2235/96C10M2201/041
Inventor 谭瑞轩李炎峰
Owner HUNAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com