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Method for preparing high thermal conductivity graphite material

A technology of high thermal conductivity graphite and natural flake graphite, which is applied in the field of rapid preparation of high thermal conductivity graphite materials, can solve the problems of limited space for improving the thermal conductivity of graphite materials, long preparation cycle, etc., and achieve short preparation process cycle, low cost and high thermal conductivity. Good results

Active Publication Date: 2009-09-23
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

However, the preparation process of this type of material requires multiple impregnation-carbonization cycles, so not only the preparation cycle is long, but the room for improving the thermal conductivity of the final graphite material is also limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] First, 90% by weight of natural flake graphite is placed in a kneading mixer and the temperature is raised to 130° C., wherein the natural flake graphite powder used has a particle size of 600 μm and a carbon content of 98%. During the heating process of filler flake graphite, 10% by weight of coal tar pitch is put into a stainless steel barrel and placed on a heating plate to melt the pitch in the barrel into a liquid. 49 wt%. Then pour the melted liquid asphalt into the kneading mixer for 1 hour. After the kneading is completed, put the mixed raw materials into a steel mold with a preheating temperature of 130°C, and then knead at 400kg / cm 2 The pressure was pressed and held for 10 minutes. When the mold temperature drops to 75°C, the mold is released, and then the pressed molded product is placed in a graphitization furnace for treatment to 2500°C and kept at a constant temperature for 0.5h. When it is naturally cooled to 100°C, it is released from the furnace, and...

Embodiment 2

[0014] 88% by weight of natural flake graphite is placed in a kneading mixer and the temperature is raised to 130° C., wherein the natural flake graphite powder used has a particle size of 350 μm and a carbon content of 98.8%. During the heating process of the filler flake graphite, put 12% coal tar pitch into a stainless steel barrel and put it on a heating plate to melt the pitch in the barrel into a liquid. The softening point of the coal tar pitch used is 106°C and the residual carbon ratio 52 wt%. Then pour the melted liquid asphalt into the kneading mixer for 1 hour. After the kneading is completed, put the mixed raw materials into a steel mold with a preheating temperature of 130°C, and then mix them at a temperature of 300kg / cm 2 The pressure was pressed and held for 10 minutes. When the mold temperature drops to 75°C, the mold is released, and then the pressed molded product is placed in a graphitization furnace for treatment to 2500°C and kept at a constant temperat...

Embodiment 3

[0016] First, 85% by weight of natural flake graphite is put into a kneading mixer and the temperature is raised to 130° C., wherein the natural flake graphite powder used has a particle size of 600 μm and a carbon content of 98%. During the heating process of filler flake graphite, put 15% coal tar pitch into a stainless steel barrel and put it on a heating plate to melt the pitch in the barrel into a liquid. The softening point of the coal tar pitch used is 102°C, and the residual carbon ratio 49 wt%. Then pour the melted liquid asphalt into the kneading mixer for 1 hour. After the kneading is completed, put the mixed raw materials into a steel mold with a preheating temperature of 130°C, and then mix them at a temperature of 300kg / cm 2 The pressure was pressed and held for 10 minutes. When the mold temperature drops to 75°C, the mold is released, and then the pressed molded product is placed in a graphitization furnace for treatment to 2500°C and kept at a constant tempera...

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Abstract

The invention relates to a method for preparing a high thermal conductivity graphite material. The method takes the 80-90 of natural scale graphite percentage by weight and the 10-20 of coal pitch percentage by weight as the raw materials, after the temperature of the natural scale graphite is raised to 120-150 DEG C and the coal pitch is fused into liquid, the natural scale graphite is added in for kneading for 0.5-2 h, after the kneading is finished, the mixed raw material is put in a die with temperature of 120-150 DEG C and then is molded by pressing under the pressure of 200-600 kg / cm<2> and the dwelling is carried out for 5-15 min, the demoulding is carried out after the die temperature is reduced to 60-90 DEG C, then the molded product is put in a graphitizing furnace for heating to 2300-2800 DEG C and constant temperature for 0.5-1 h at the highest temperature, and then the molded product is discharged from the furnace after being naturally cooled to 50-100 DEG C to obtain high thermal conductivity graphite material. The invention has the advantages of short period of the preparation process, low manufacturing cost and good thermal conductivity of the graphite material.

Description

technical field [0001] The invention belongs to a method for preparing a graphite material, in particular to a method for rapidly preparing a high thermal conductivity graphite material. Background technique [0002] High-power density electronic devices and high-end electronic industrial devices are gradually developing towards miniaturization, compact structure, and high power density. The enhanced export and dissipation of heat generated in the process puts forward higher requirements. At present, the heat sink substrates used in general heat dissipation materials (such as civilian high-end electronic devices, LED chip materials, heat exchangers for industrial equipment, etc.) are almost all aluminum alloys, but aluminum does not have the highest thermal conductivity (237W / m.K). metal material. Gold and silver have better thermal conductivity, but the disadvantage is that the price is too high; the thermal conductivity of copper (398W / m.K) is second, but copper is relat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 郭全贵刘占军刘朗宋进仁
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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