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Preparation method of ceramic powder doped modified self-sintering graphite composite material

A composite material and ceramic powder technology, which is applied in the field of preparation of ceramic powder doped modified self-sintered graphite composite materials, can solve the problems of difficult dispersion of ceramic particles, low efficiency, poor bonding strength between the matrix phase and the ceramic phase interface, etc., to achieve Short process, wide range of sources, and the effect of improving interface bonding

Active Publication Date: 2021-08-06
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcomings of the existing ceramic doped graphite preparation technology, on the one hand, solve the problem of difficult dispersion and low efficiency of ceramic particles in raw material compacted powder, and on the other hand, solve the problem of poor bonding strength between the matrix phase and the ceramic phase interface, the present invention provides A preparation method of ceramic doped modified self-sintered graphite composite material

Method used

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  • Preparation method of ceramic powder doped modified self-sintering graphite composite material
  • Preparation method of ceramic powder doped modified self-sintering graphite composite material
  • Preparation method of ceramic powder doped modified self-sintering graphite composite material

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Embodiment 1

[0026] A preparation method of ceramic powder doped modified self-sintered graphite composite material, comprising the following steps:

[0027] S1. Put the boron nitride powder with a particle size of 1-3μm and the modified asphalt powder with a particle size of 100 mesh into the four-dimensional mixer at a mass ratio of 2:8 for sealed mixing operation. The mixing speed is 30r / min, and the mixing time is For 24h, the mixture was prepared;

[0028] S2. First, put the mixture prepared in step S1 into the autoclave, and replace the air in the autoclave with nitrogen; then, heat up the autoclave in a sealed manner, control the pressure in the autoclave to 0-3 MPa, and the heating rate is 50 °C / h , the final temperature of the kettle core is 420°C, and the final temperature holding time is 12 hours; finally, the semi-carbonization process is completed after the autoclave naturally cools down, and a green coke-coated composite ceramic powder is produced;

[0029] S3. The raw coke-...

Embodiment 2

[0034] A preparation method of ceramic powder doped modified self-sintered graphite composite material, comprising the following steps:

[0035] S1. Add the boron carbide powder with a particle size of 1-3μm and the modified asphalt powder with a particle size of 100 mesh in a mass ratio of 3:7 to the four-dimensional mixer for sealing and mixing operation. The mixing speed is 30r / min, and the mixing time is 24h, make mixture;

[0036] S2. First, put the mixture prepared in step S1 into the autoclave, and replace the air in the autoclave with nitrogen; then, heat up the autoclave in a sealed manner, control the pressure in the autoclave to 0-3 MPa, and the heating rate is 50 °C / h , the final temperature of the kettle core is 410°C, and the final temperature holding time is 8 hours; finally, the semi-carbonization process is completed after the autoclave naturally cools down, and the green coke-coated composite ceramic powder is produced;

[0037] S3. The raw coke-coated compo...

Embodiment 3

[0042] A preparation method of ceramic powder doped modified self-sintered graphite composite material, comprising the following steps:

[0043] S1. Add the mixture of boron nitride and silicon nitride powder with a particle size of 1-3 μm (the molar ratio of silicon to boron is 1:6) and the modified asphalt powder with a particle size of 100 mesh into the four-dimensional mixture at a mass ratio of 2.5:7.5 The machine is sealed and mixed, the mixing speed is 30r / min, and the mixing time is 24h to prepare the mixture;

[0044] S2. First, put the mixture prepared in step S1 into the autoclave, and replace the air in the autoclave with nitrogen; then, heat up the autoclave in a sealed manner, control the pressure in the autoclave to 0-3 MPa, and the heating rate is 50 °C / h , the final temperature of the kettle core is 400°C, and the final temperature holding time is 12 hours; finally, the semi-carbonization process is completed after the autoclave naturally cools down, and the g...

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Abstract

The invention discloses a preparation method of a ceramic powder doped modified self-sintering graphite composite material, belongs to the technical field of preparation of special graphite composite materials, and solves the problems that ceramic particles are difficult to disperse in raw material pressed powder, the efficiency is low, and the interface bonding strength of a matrix phase and a ceramic phase is poor. According to the method, the ceramic powder is introduced into the raw material for preparing the graphite through an in-situ coating method, so that the phenomenon of non-uniform distribution of ceramic particles is effectively improved, and effective carbon coating can be formed on the ceramic particles, so that the microcosmic interface of the material is improved. In the material preparation process, firstly, the ceramic powder is added into the modified asphalt to serve as a nucleating agent to promote liquid-phase semi-carbonization of the modified asphalt, and green coke coated composite ceramic powder is prepared; the surface green coke has the self-sintering property, so that the ceramic component and the carbon component of the material can be synchronously shrunk and densified in the subsequent heat treatment process, and finally the ceramic doped modified self-sintered graphite composite material with uniform ceramic particle distribution, high interface bonding strength and excellent comprehensive performance is prepared.

Description

technical field [0001] The invention belongs to the technical field of preparation of special graphite composite materials, and in particular relates to a preparation method of ceramic powder doped modified self-sintered graphite composite materials. Background technique [0002] The original intention of preparing ceramic-doped graphite composites is to improve the corresponding performance defects of graphite matrix by using the characteristics of high hardness, friction resistance or high temperature oxidation resistance of ceramics. For example, the introduction of silicon carbide can improve the hardness and wear resistance of graphite materials, and effectively reduce the wear amount of materials; for graphite materials with low degree of graphitization, the introduction of boron nitride or silicon carbide can form a lubricating abrasive layer on the wear surface of the material , reduce the friction coefficient and improve the friction environment; the introduction of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/528C04B35/622C04B35/628
CPCC04B35/522C04B35/622C04B35/62839C04B2235/386C04B2235/3821C04B2235/5436C04B2235/48C04B2235/658C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96C04B2235/9684
Inventor 刘占军赵红超张俊鹏
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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