High-thermal-conductivity carbon fiber composite material and preparation method thereof

A technology of carbon fiber and composite materials, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of increasing the thermal resistance of fibers and heat-conducting particles, and the improvement of thermal conductivity is not significant, so as to achieve synergistic improvement of thermal conductivity, Reduce phonon scattering and interface thermal resistance, low process equipment requirements

Active Publication Date: 2022-01-04
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the heat-conducting particles and fibers have been pre-wrapped with resin, even if the orientation structure is formed during the molding process, the heat-conducting components are isolated by resin, which greatly increases the thermal resistance between the fibers and the heat-conducting particles, making the thermal conductivity not improved. significantly

Method used

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  • High-thermal-conductivity carbon fiber composite material and preparation method thereof
  • High-thermal-conductivity carbon fiber composite material and preparation method thereof

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Embodiment 1

[0033] In this embodiment, the specific preparation parameters of the carbon fiber skeleton with a three-dimensional oriented interconnected network structure are:

[0034] Chopped mesophase pitch-based carbon fiber (MPCF) was selected as carbon fiber, with a diameter of 10 μm and a length distribution between 100 and 200 μm; graphene oxide was exfoliated by electrochemical method, and its sheet diameter was concentrated at 1.5 μm. The thickness is 1 nm.

[0035] (1) Take the graphene oxide exfoliated by the electrochemical method, prepare 20 mL of graphene oxide / water dispersion with a concentration of 10 mg / mL, and ultrasonically 30 min to make it completely dispersed. Weigh 6.8 g of chopped mesophase pitch-based carbon fibers and add them to the aqueous dispersion of graphene oxide, disperse with magnetic stirring for 1 hour, ultrasonically disperse for 30 minutes, and then disperse with magnetic stirring for 1 hour, so that the carbon fibers and graphene oxide are fully mi...

Embodiment 2

[0040] In this embodiment, the specific preparation parameters of the carbon nanotube fiber skeleton with a three-dimensional oriented interconnected network structure are:

[0041] Electrospun carbon nanotube fibers that have been cut off are selected, and their diameters are concentrated at 9 μm, and their lengths are distributed between 400 and 650 μm. 1nm.

[0042] (1) Take the graphene oxide exfoliated by the electrochemical method, prepare 20 mL of graphene oxide / water dispersion with a concentration of 5 mg / mL, and disperse it completely and evenly by ultrasonication for 30 min. Weigh 5.7g of carbon nanotube fibers into the graphene oxide water dispersion, magnetically stir and disperse for 1h, ultrasonically disperse for 30min, then magnetically stir and disperse for 1h, so that the carbon nanotube fibers and graphene oxide are fully mixed and dispersed evenly .

[0043] (2) Transfer the carbon nanotube fiber / graphene oxide mixture to a hydrothermal reaction kettle, ...

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Abstract

The invention relates to the field of functional composite materials, in particular to a high-thermal-conductivity carbon fiber composite material and a preparation method thereof. Carbon fibers are used as a main construction unit of a high-orientation heat transport network, and graphene oxide which has a self-assembly characteristic and has a lattice structure similar to that of the carbon fibers is used as a bridging agent. A self-supporting network structure that is three-dimensionally interconnected between carbon fibers and graphene oxide and is highly oriented in a specific direction is constructed by ice template method or hydrothermal reduction assembly, and composite materials with high thermal conductivity are prepared after compounding with a polymer matrix. According to the prepared high-orientation carbon fiber self-supporting structure, the graphene oxide serves as a bridging agent, wrapping of a traditional polymer binder is avoided, the carbon fibers are effectively connected with one another through the graphene oxide, and a synergistic orientation three-dimensional heat conduction enhanced network structure is jointly formed; and the heat-conducting property of the composite material is obviously improved under the condition of low filling amount.

Description

technical field [0001] The invention relates to the field of functional composite materials, in particular to a high thermal conductivity carbon fiber composite material and a preparation method thereof. Background technique [0002] With the continuous development of electronic equipment towards miniaturization, integration, and high power density, heat dissipation has increasingly become a key factor and technical bottleneck restricting the performance, safety, reliability, and service life of electronic equipment. According to reports, every time the chip temperature of an integrated circuit rises by 18 degrees, the reliability of the chip will drop by 2 to 3 times. Therefore, the development of composite materials with excellent thermal conductivity is of great significance for efficient heat transfer and heat dissipation in the electronics field. [0003] The current research hotspot of thermally conductive composite materials is to combine nano-carbon materials with h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K7/06C08K3/04C09K5/14
CPCC08K7/06C08K3/042C09K5/14C08L83/04
Inventor 曾尤张建岗王函张藤心孙新阳鲁妮张天宇马源刘畅
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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