Method for preparing high thermal conductivity graphite material

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

A kind of method for preparing high thermal conductivity graphite material technical field 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 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 con...

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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.