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Preparation method of graphite radical composite material

A composite material and graphite-based technology, applied in the field of composite material preparation, can solve problems such as low strength, and achieve the effects of increased strength, convenient operation and improved bonding performance

Inactive Publication Date: 2008-03-05
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

U.S. Patent US 3140190 prepares a refractory material by mixing graphite powder with a ceramic additive (molybdenum silicide, titanium boride) and a liquid carbonaceous binder. Although its strength has increased, it is twice the strength of pure graphite and can It can be seen that its strength is still low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Expanded graphite with an expansion ratio of 200mL / g and petroleum coke powder were mixed at a weight ratio of 10:1 and compressed into a film at a compression pressure of 5 MPa. The binder is petroleum asphalt with a softening point of 200° C., the added reinforcing filler is carbon fiber, and the content is 0.1% of the pitch weight, and the added catalytic graphitization filler is Zr powder, and the added amount is 15% of the pitch weight. Dissolve the asphalt with toluene, add carbon fiber and Zr powder, mix well and remove the solvent to prepare the asphalt mixture. The compressed expanded graphite and coke powder composite film is impregnated into the asphalt mixture; the pressure is 10MPa during immersion, the temperature is 110°C, and the time is 120 minutes; after cooling, it is broken into small particles, wherein the content of expanded graphite and coke powder is 60%. The asphalt mixture content is 40%. The above mixture was hot-pressed at 1400° C. under a p...

Embodiment 2

[0029] Expanded graphite with an expansion ratio of 300mL / g and petroleum coke powder were mixed at a weight ratio of 1:1 and compressed into a film at a compression pressure of 10 MPa. The binder is coal tar pitch, the softening point is 105°C, the reinforcing filler is carbon nanotubes, the content is 30% of the pitch weight, and the catalytic graphitization filler is Ti powder, and the addition amount is 1% of the pitch weight. Dissolve the asphalt with toluene, add carbon nanotubes and Ti powder, mix well and remove the solvent to prepare the asphalt mixture. The compressed expanded graphite and coke powder composite film is impregnated into the asphalt mixture; the pressure is 50MPa during immersion, the temperature is 140°C, and the time is 30 minutes; after cooling, it is broken into small particles, wherein the content of expanded graphite and coke powder is 80%. The asphalt mixture content is 20%. The above mixture was hot-pressed at 3000° C. under a pressure of 10 M...

Embodiment 3

[0031] Expanded graphite with an expansion ratio of 300mL / g and petroleum coke powder were mixed at a weight ratio of 5:1 and compressed into a film at a compression pressure of 30MPa. The binder is coal tar pitch, the softening point is 105°C, the reinforcing filler is carbon nanotubes, the content is 30% of the pitch weight, and the catalytic graphitization filler is Ti powder, and the addition amount is 1% of the pitch weight. Dissolve the asphalt with propylene carbonate, add carbon nanotubes and Ti powder, mix well and remove the solvent to prepare the asphalt mixture. The compressed expanded graphite and coke powder composite film is impregnated into the asphalt mixture; the pressure is 30MPa during impregnation, the temperature is 140°C, and the time is 30 minutes; after cooling, it is broken into small particles, wherein the content of expanded graphite and coke powder is 75%. The asphalt mixture content is 25%. The above mixture was hot-pressed at 2400° C. under a pr...

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Abstract

The present invention provides preparation process of graphite-base composite material. The preparation process includes the following steps: mixing expandable graphite powder and coke powder and pressing at pressure of 5-50 MPa to form base board with graphite as main component; dissolving asphalt in organic solvent, adding reinforcing material and graphitization catalyzing stuffing, mixing, and eliminating solvent to obtain adhesive mixture; smelting the adhesive mixture at 110-140 deg.c, and soaking the base board at gas pressure of 1-50MPa for 10-120 min; taking out the base board, cooling to room temperature and crushing; and molding the crushed mixture. The graphite-base composite material has excellent electric performance, excellent heat performance, excellent mechanical performance and low cost.

Description

(1) Technical field [0001] The invention relates to a method for preparing a composite material, in particular to a method for preparing a graphite-based composite material with expanded graphite as the main raw material. (2) Background technology [0002] Graphite material has good electrical conductivity, low coefficient of thermal expansion, thermal shock resistance and thermal stability. Therefore, it is widely used in chemical industry, aerospace, nuclear energy and other fields. The current high-strength, high-thermal conductivity graphite materials are generally prepared by mixing petroleum coke or pitch coke with binders and reinforcing agents, molding, and high-temperature graphitization. Compared with other petroleum coke and pitch coke, natural graphite has higher thermal stability, lower resistivity, volatile content and thermal expansion coefficient. However, the strength of materials prepared from natural graphite is low, so it is mainly used in the electric ...

Claims

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Application Information

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IPC IPC(8): C04B35/536
Inventor 魏彤范壮军
Owner HARBIN ENG UNIV
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