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Heat conductive graphite sheet and preparation method thereof

A heat-conducting graphite sheet and graphite technology are applied in the field of heat-conducting graphite sheet and its preparation, which can solve the problems of low thermal conductivity and insufficient thermal conductivity of a thermally conductive film, and achieve the effects of good thermal conductivity, easy realization and a wide range of thicknesses.

Active Publication Date: 2018-07-27
ZHUZHOU CHENXIN INDUCTION EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] After long-term research, the applicant found that the main reason for the insufficient thermal conductivity of the thermal conductivity film is that during the preparation process of the graphite block or graphite sheet, the graphite microcrystals inside the film are arranged chaotically, and the graphite microflakes are arranged irregularly, so that all directions on the surface The same thermal conductivity, resulting in a lower thermal conductivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Disperse graphene oxide in deionized water, the weight ratio of the two is 1:9, and add Fe with a particle size of 20nm 3 o 4 Magnetic particles, Fe 3 o 4 The proportion of magnetic particles was 0.6wt%, and ultrasonic dispersion was used for 3 hours to mix uniformly with an ultrasonic machine to obtain graphite slurry.

[0043] Spread 5 μm thick PET on the glass surface, then evenly coat the graphite slurry on the PET surface with a thickness of 5mm, and then place it in a superconducting magnetic field with a strength of 5T. The direction of the magnetic field is the same as that of the coating surface. Vibrate, after 10 minutes, gradually increase the temperature to 80°C at 0.5°C / min, and keep it until the coating is dry. The obtained coated coating was heated at 1.5°C / min to 1500°C for carbonization treatment (nitrogen protection) for 1 hour, and then placed at 3000°C for 1 hour to obtain the final heat-conducting graphite sheet.

[0044] The test results show t...

Embodiment 2

[0046] Disperse graphene oxide in deionized water, the weight ratio of the two is 1:15, and add Fe with a particle size of 15nm 3 o 4 Magnetic particles, Fe 3 o 4The proportion of magnetic particles is 1.0wt%, and the graphite slurry is obtained by ultrasonic dispersion for 2.5 hours until uniform mixing.

[0047] Spread 5 μm thick PET on the glass surface, then evenly coat the graphite slurry on the PET surface with a thickness of 8mm, and then place it in a superconducting magnetic field with a strength of 3T. The direction of the magnetic field is the same as that of the coating surface. Vibrate, after 10 minutes, gradually increase the temperature to 80°C at 1°C / min, and keep it until the coating is dry. The obtained coated coating was heated at 1 °C / min to 1500 °C for carbonization treatment (nitrogen protection) for 1 h, and then placed at 3000 °C for 1.5 h to obtain the final thermally conductive graphite sheet.

[0048] The test results show that the thickness of t...

Embodiment 3

[0050] Disperse graphene oxide in deionized water, the weight ratio of the two is 1:25, and add Fe with a particle size of 50nm 3 o 4 Magnetic particles, Fe 3 o 4 The proportion of the magnetic particles is 2wt%, and the ultrasonic dispersion is used for 3 hours to mix uniformly, and the graphite slurry is obtained.

[0051] Spread 5 μm thick PET on the glass surface, then evenly coat the graphite slurry on the PET surface with a thickness of 15mm, and then place it in a superconducting magnetic field with a strength of 6T. The direction of the magnetic field is at a perpendicular angle to the coating plane, and at the same time increase Ultrasonic vibration, after 10 minutes, gradually increase the temperature to 80°C at 0.5°C / min, and keep it until the coating is dry. The obtained coated coating was heated at 1.2°C / min to 1500°C for carbonization treatment (nitrogen protection) for 1 hour, and then placed at 2850°C for 2 hours to obtain the final heat-conducting graphite ...

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Abstract

The invention discloses a heat conductive graphite sheet and a preparation method thereof. The preparation method includes steps of: S1) dispersing a graphite raw material and magnetic particles in water to obtain graphite slurry, wherein the graphite raw material is graphite oxide and / or graphene oxide, and the main component of the solvent is water; S2) spreading the graphite slurry on a substrate and placing the substrate in a magnetic field environment, and heating and drying the substrate to form a coating layer; S3) carbonizing and graphitizing the dried coating layer, thus preparing theheat conductive graphite sheet. In the method, magnetic field is used for regulating oriented arrangement of the material to form the heat conductive graphite sheet, wherein the graphite micro-sheetssupport the magnetic particles and the arrangement direction of the graphite micro-sheets is regulated by the magnetic field, thereby improving heat conductivity of the graphite sheet.

Description

technical field [0001] The invention relates to a thermally conductive graphite sheet and a preparation method thereof, belonging to the field of graphite thermally conductive. Background technique [0002] Graphite is a form of carbon, which has good thermal conductivity, electrical conductivity, high temperature resistance, acid and alkali corrosion resistance, etc., especially thermal conductivity. Its theoretical thermal conductivity is 2000W / m·K, which exceeds the thermal conductivity of most metals. performance. [0003] The graphite structure is formed by stacking multiple planes, and the regular hexagons arranged by carbon atoms in each layer extend infinitely. The layers are connected by van der Waals force, so the thermal conductivity of graphite in the layer direction is much higher than that of The thermal conductivity of the vertical plane. [0004] Chinese invention patent application CN201510480016.1 (a preparation method of graphene film), Chinese invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/52C04B35/622
CPCC04B35/522C04B35/622C04B2235/3272C04B2235/6562C04B2235/77C04B2235/96C04B2235/9607
Inventor 朱登伟罗旺
Owner ZHUZHOU CHENXIN INDUCTION EQUIP CO LTD
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