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Carbon-based composite with high rebound resilience and high heat conductivity coefficient along thickness direction and preparation method of carbon-based composite

A technology of carbon-based composite materials and thickness direction, which is applied in the field of carbon-based composite materials with high resilience and high thermal conductivity along the thickness direction and its preparation. It can solve the problems of low thermal conductivity and poor resilience of graphite heat-conducting sheets, and achieve growth shape controllable effect

Active Publication Date: 2015-10-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the defects of low thermal conductivity along the thickness direction and poor resilience of the existing graphite heat conduction sheets prepared from expanded graphite, and provides a carbon-based composite material with high resilience and high thermal conductivity along the thickness direction and a preparation method thereof

Method used

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  • Carbon-based composite with high rebound resilience and high heat conductivity coefficient along thickness direction and preparation method of carbon-based composite
  • Carbon-based composite with high rebound resilience and high heat conductivity coefficient along thickness direction and preparation method of carbon-based composite

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Select 1.8 g and 18 g of absolute ethanol and xylene respectively to prepare a carbon source solution, and add 0.2 g of ferrocene to the carbon source solution to prepare a ferrocene carbon source solution with a mass fraction of 1%. Place expanded graphite with an expansion rate of 100 in a tube furnace, pass through argon protection, heat the tube furnace to 700°C, inject the above-mentioned ferrocene carbon source solution, and the injection speed of the ferrocene carbon source solution is The growth time was controlled at 10mL / h, and the growth time was 120min. After the growth, stop injecting the ferrocene carbon source solution, and take it out after cooling to room temperature under the protection of inert gas. The expanded graphite with carbon nanotubes growing arrays is placed in a graphite mold and placed in a vacuum hot-press furnace for high-temperature hot-pressing. The heating rate is 200°C / h, the hot-pressing temperature is 1500°C, and the hot-pressing pre...

Embodiment 2

[0026] 9.5 g of absolute ethanol and xylene were selected to form a carbon source solution, and 1 g of ferrocene was added to the carbon source solution to form a ferrocene carbon source solution with a mass fraction of 5%. Place expanded graphite with an expansion rate of 300 in a tube furnace, pass through argon protection, heat the tube furnace to 900°C, inject the above-mentioned ferrocene carbon source solution, and the injection speed of the ferrocene carbon source solution is Control at 30mL / h, growth time is 30min, stop injecting ferrocene carbon source solution after growth, and cool to room temperature under the protection of inert gas to take out. The expanded graphite growing arrayed carbon nanotubes is placed in a graphite mold and placed in a vacuum hot-press furnace for high-temperature hot-pressing. The heating rate is 300°C / h, the hot-pressing temperature is 2000°C, and the hot-pressing pressure is 40MPa. After 1h, when the temperature dropped to 100°C, the pr...

Embodiment 3

[0028]9.6 g of absolute ethanol and xylene were selected to form a carbon source solution, and 0.8 g of ferrocene was added to the carbon source solution to form a ferrocene carbon source solution with a mass fraction of 4%. Place expanded graphite with an expansion rate of 200 in a tube furnace, pass through argon protection, heat the tube furnace to 800°C, inject the above-mentioned ferrocene carbon source solution, and the injection speed of the ferrocene carbon source solution is The growth time was controlled at 20mL / h, and the growth time was 60min. After the growth, stop injecting the ferrocene carbon source solution, and take it out after cooling to room temperature under the protection of inert gas. The expanded graphite with carbon nanotubes growing arrays is placed in a graphite mold, placed in a vacuum hot-press furnace for high-temperature hot-pressing, the heating rate is 260°C / h, the hot-pressing temperature is 1600°C, and the hot-pressing pressure is 30MPa. Aft...

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Abstract

The invention relates to a preparation method of a carbon-based composite with high rebound resilience and high heat conductivity coefficient simultaneously along a thickness direction. Graphite sheets in expanded graphite are connected to one another by arrayed carbon nano tubes; gaps among the graphite sheets are filled with the arrayed carbon nano tubes; the heat conductivity coefficient is greater than or equal to 25W / (m.K) along the thickness direction; and after the graphite sheets are compressed by 10%, the rebound rate is greater than or equal to 90%. The arrayed carbon nano tubes grow through ferrocene carbon source solution; ferrocene cracks into iron atoms which are adhered to the graphite sheets of the expanded graphite, the carbon source solution cracks into carbon atoms which are adhered to surfaces of the iron atoms, so that the arrayed carbon nano tubes grow among the graphite sheets of the expanded graphite, heat flow can be transferred among the graphite sheets in the expanded graphite by high heat conductivity of the carbon nano tubes, the graphite sheets can be oriented along a perpendicular hot-pressing direction, namely a horizontal direction, the arrayed carbon nano tubes are connected to one another in the thickness direction, the graphite sheets and the gaps of the expanded graphite are filled with the arrayed carbon nano tubes, and the carbon-based composite with the high rebound resilience and the high heat conductivity coefficient along the thickness direction is obtained.

Description

technical field [0001] The invention relates to a method for preparing a carbon-based composite material with high elasticity and high thermal conductivity along the thickness direction, in particular to a method for preparing a composite material of expanded graphite and arrayed carbon nanotubes. Background technique [0002] With the rapid development of science and technology, efficient heat conduction and heat dissipation have become key issues in the field of thermal management. For example, with the continuous improvement of the integration of electronic components in electrical devices such as computers and mobile phones, the continuous increase in the heat generated by the electronic devices per unit area has caused a sudden increase in the heat generated by the system. If there is no adequate thermal management guarantee, it is very easy to cause premature aging or damage of related devices. Many electronic components need to work normally at a temperature of 40-60...

Claims

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Application Information

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IPC IPC(8): C04B35/536C04B35/622
Inventor 封伟秦盟盟冯奕钰
Owner TIANJIN UNIV
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