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Preparation method of high-strength and high-thermal conductivity graphite material

A technology with high thermal conductivity and high strength, which is applied in the field of preparing high-strength and high-thermal-conduction bulk graphite materials. It can solve the problems of limited size, poor mechanical properties, and difficulty in general application, achieving good thermal conductivity and strength, and a wide range of applications. , The effect of simple process

Active Publication Date: 2018-10-26
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of high thermal conductivity carbon fiber, which the thermal conductivity of the first type of material depends on, has great difficulties and high cost
The other type is high thermal conductivity graphite material, but this preparation process is not only costly, but also the size of the prepared material is limited, so it is difficult to be widely used
At the same time, many high thermal conductivity graphite materials are prepared using natural flake graphite, which leads to poor mechanical properties of the product, and the bending strength is only about 10Mpa, which cannot meet the needs of structural parts that require mechanical properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] After crushing 1,000 grams of raw needle coke to a particle size of ≤0.1mm, take 200 grams of raw needle coke and calcinate at 1280°C for 120 minutes without air to obtain 186 grams of calcined coke; finely crush the calcined needle coke to The particle size is ≤0.05 mm; another 200 grams of coal tar pitch is crushed to a particle size of ≤0.15 mm, the softening point of the coal tar pitch used is 112°C, and the residual carbon rate is 56.6 wt%. Put 800 grams of crushed raw needle coke, 150 grams of calcined coke and coal tar pitch into a kneader and mix them at room temperature for 1.2 hours, then heat to 140°C for 1 hour of hot kneading to make a paste, and then put the paste in the kneading machine Heat the sheet on the tablet machine for 3 times, and the temperature of the sheet is 140°C; the paste after sheeting is treated in an autoclave at 400°C and a pressure of 3Mpa for 1 hour, and the pressure is released at a temperature of 360°C and then purged with nitrogen ...

Embodiment 2

[0027]After crushing 1,000 grams of raw needle coke to a particle size of ≤0.1mm, take 250 grams of raw needle coke and calcinate at 1250°C for 130 minutes without air to obtain 232 grams of calcined coke; finely crush the calcined needle coke to The particle size is ≤0.05mm; another 250 grams of coal tar pitch is crushed to a particle size of ≤0.15mm, the softening point of the coal tar pitch used is 112°C, and the residual carbon rate is 56.6wt%. Put 750 grams of crushed raw needle coke, 220 grams of calcined coke and coal tar pitch into a kneader and mix at room temperature for 0.5 hours, then heat to 150°C for 1.5 hours of hot kneading to make a paste, and then put the paste in the kneading machine Heat the sheet on the tablet machine for 4 times, and the temperature of the sheet is 150°C; the paste after sheeting is treated in an autoclave at 420°C and a pressure of 3.5Mpa for 2 hours, and then purged with nitrogen after the pressure is released at a temperature of 350°C ...

Embodiment 3

[0033] After crushing 1,000 grams of raw needle coke to a particle size of ≤0.1mm, take 300 grams of raw needle coke and calcinate at 1350°C for 150 minutes without air to obtain 276 grams of calcined coke; finely crush the calcined needle coke to The particle size is ≤0.05 mm; another 200 grams of coal tar pitch is crushed to a particle size of ≤0.15 mm, the softening point of the coal tar pitch used is 112°C, and the residual carbon rate is 56.6 wt%. Put 700 grams of crushed raw needle coke, 260 grams of calcined coke and coal tar pitch into a kneader and mix at room temperature for 1.5 hours, then heat to 140°C and knead for 1.8 hours to make a paste. Heat the sheet on the tablet machine for 3 times, and the temperature of the sheet is 140°C; the paste after sheeting is treated in an autoclave at 410°C and a pressure of 4Mpa for 3 hours, and after the pressure is released at a temperature of 370°C, it is purged with nitrogen for 4 hours. Hour.

[0034] Cool the paste treat...

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Abstract

The invention relates to a preparation method of a high-strength and high-thermal conductivity graphite material. The preparation method comprises the steps of with crushed raw needle coke and calcined needle coke as aggregates and asphalt as a binder, adding the asphalt into the aggregates so as to obtain a raw material, mixing the raw material in a kneading machine, carrying out thermal kneadingso as to obtain paste, thermally rolling the paste into pieces, processing the paste at the temperature of 350-450 DEG C and the pressure of 3Mpa-5Mpa, regrinding the paste, putting the paste into amold for formation, and carrying out constraint roasting, dipping, carbonization and graphitization on a formed raw blank, so as to obtain a high-strength and high-thermal conductivity graphite product. The preparation method has the advantages that the raw material sources are wide, the price of the graphite material is cheap, the process is simple, the production period is short, the industrialproduction is easily realized, and the prepared product has good thermal conductivity and relatively high strength, and the like.

Description

technical field [0001] The invention belongs to a method for preparing a graphite material, in particular to a method for preparing a block graphite material with high strength and high thermal conductivity. Background technique [0002] Polycrystalline graphite material is widely used in many fields because of its light weight, high temperature resistance, ablation resistance, good thermal, electrical and mechanical properties. As early as 1947, the solid sounding rocket launched by the United States successfully applied polycrystalline graphite Throat lining, and its application in chemical industry, metallurgy, nuclear fusion reactor, electronics, etc. is becoming more and more in-depth. [0003] The theoretical thermal conductivity of graphite single crystal can reach 2100W / m·K, while the thermal conductivity of ordinary graphite materials is only about 100W / m·K at room temperature. It can be seen that the thermal conductivity of graphite materials still has a lot of roo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/532C04B35/622
CPCC04B35/522C04B35/532C04B35/622C04B2235/616C04B2235/6562C04B2235/6567C04B2235/661C04B2235/77C04B2235/96C04B2235/9607
Inventor 刘占军李国栋张俊鹏郭晓慧郭全贵
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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