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Preparation process for highly oriented graphite composite material

A composite material and preparation technology, which is applied in the field of high-oriented graphite composite material preparation technology, can solve the problems of reducing graphite strength, difficulty in reaching sintering temperature, and low compactness, so as to improve oxidation resistance, reduce sintering temperature, and improve compactness sexual effect

Inactive Publication Date: 2015-09-09
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the graphitization temperature is high, and it is difficult for general sintering equipment to reach this sintering temperature; using natural flake graphite as raw material, pressureless sintering, adding binder volatilization during the preparation process will also form pores, and the compactness is low; the most important thing is graphite After the powder is mixed, put it into the graphite grinding tool. The graphite in the mixture has poor orientation, so larger flake graphite particles must be used to improve the orientation. The graphite particle size is 175-701 μm, and the larger Particles reduce the strength of graphite

Method used

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  • Preparation process for highly oriented graphite composite material
  • Preparation process for highly oriented graphite composite material
  • Preparation process for highly oriented graphite composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1. Preparation of graphite casting sheet: first weigh 29.32 grams of polyvinyl butyral, 29.32 grams of polyvinyl alcohol, and 586.4 grams of ethanol, stir well, then add 154 grams of sheets with a diameter of 5-20 μm and a thickness of 1-2 μm Shaped graphite, 91.2 grams of zirconium boride powder of 1 to 5 μm and 48 grams of silicon carbide powder of 0.5 to 2 μm are stirred evenly to form zirconium boride cast material, in which flake graphite powder, zirconium boride powder and silicon carbide powder are Weigh according to 70%: 15%: 15% volume percentage; then tape casting, drying at room temperature and demoulding to obtain a graphite casting sheet with a thickness of 50-150 μm;

[0031] 2) Slice the cast graphite sheet according to the size of the mold;

[0032] 3) Superimpose the sliced ​​graphite casting sheet into the graphite abrasive tool, pre-press molding, the molding pressure is 20MPa, and the temperature is 80°C;

[0033] 4) Put the pre-pressed green body t...

Embodiment 2

[0036] 1. Preparation of graphite casting sheet: first weigh 73.32 grams of polyvinyl butyral, 73.32 grams of polyethylene glycol, and 1466.4 grams of ethanol, stir well, then add 198 grams of graphite with a diameter of 5-20 μm and a thickness of 1-2 μm Flake graphite, 30.4 grams of zirconium boride powder of 1-5 μm and 16 grams of silicon carbide powder of 0.5-2 μm, stir evenly to form zirconium boride cast material, of which flake graphite powder, zirconium boride powder and silicon carbide powder It is weighed according to 90%: 5%: 5% volume percentage; then tape casting, drying at room temperature and demoulding to obtain a graphite casting sheet with a thickness of 50-150 μm;

[0037] 2) Slice the cast graphite sheet according to the size of the mold;

[0038] 3) Superimpose the sliced ​​graphite cast sheets into the graphite abrasive tool, and pre-press molding, the molding pressure is 40MPa, and the temperature is 100°C;

[0039] 4) Put the pre-pressed green body toge...

Embodiment 3

[0043]1. Preparation of graphite casting sheet: first weigh 51.88 grams of polyvinyl butyral, 21.88 grams of polyvinyl alcohol, 30 grams of polyethylene glycol, and 1037.6 grams of ethanol, stir well, then add 165 grams of 5-20 μm in diameter, Flake graphite with a thickness of 1-2 μm, 30.4 grams of zirconium boride powder of 1-5 μm and 64 grams of silicon carbide powder of 0.5-2 μm are stirred evenly to form a zirconium boride casting material, in which flake graphite powder, boride Zirconium powder and silicon carbide powder are weighed according to 75%: 5%: 20% volume percentage; then tape casting, drying at room temperature and demoulding to obtain a graphite casting sheet with a thickness of 50-150 μm;

[0044] 2) Slice the cast graphite sheet according to the size of the mold;

[0045] 3) Superimpose the sliced ​​graphite cast sheets into the graphite abrasive tool, pre-press molding, the molding pressure is 30MPa, and the temperature is 90°C;

[0046] 4) Put the pre-pr...

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Abstract

The invention provides a preparation process for a highly oriented graphite composite material. The process is characterized by adopting the steps of: 1) preparing a graphite cast sheet by tape casting method: firstly adding a binder and a plasticizer into a solvent and mixing them evenly, then adding ceramic powder, mixing the mixture evenly to form a casting material, then performing tape casting, and carrying out drying and demoulding at room temperature to obtain a 50-150micrometer thick graphite cast sheet; 2) slicing the graphite cast sheet according to the mould size respectively; 3) superimposing the graphite cast sheet slices and placing them into a graphite grinding tool, and carrying out pre-press forming; 4) putting the pre-press formed green body and the graphite grinding tool into vacuum to conduct vacuum degreasing; and 5) carrying out hot pressing sintering in argon atmosphere, thus obtaining the highly oriented graphite composite material. The process provided by the invention is simple and is safe to operate, the prepared graphite composite material has high orientation, the bending strength and fracture toughness of loading in the vertical level direction are enhanced by 20% and 5% respectively than those of loading in the horizontal level direction. At the same time, the oxidation resistance is increased obviously.

Description

technical field [0001] The invention provides a preparation process for a highly oriented graphite composite material, which belongs to the technical field of composite material preparation. Background technique [0002] Due to its high melting point, low density and outstanding thermal shock resistance, graphite materials are widely used in high-temperature structural components of spacecraft and long-range weapon thermal protection systems (Thermal Protection System, TPS). Due to the highly oriented arrangement of flake graphite particles, highly oriented graphite materials have excellent properties such as thermal, electrical, magnetic, and mechanical properties, such as significant anisotropy. [0003] Highly oriented pyrolytic graphite is a polycrystalline graphite in which the C-axis direction of the grains obtained by graphitizing pyrolytic graphite under the condition of external stress is similar to graphite single crystal. At present, graphite materials with high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/52C04B35/622
Inventor 周爱萍郑明文张艳平
Owner SHANDONG UNIV OF TECH
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