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Preparation method of high-temperature-resistant oxidation-resistant heat-conducting carbon fiber/silicon carbide composite material

A composite material and carbon fiber technology, which is applied in the field of preparation of high-temperature, oxidation-resistant, thermally conductive carbon fiber/silicon carbide composite materials, can solve problems such as low thermal conductivity and weak interaction, and achieve enhanced thermal conductivity, simple method, and good mechanical properties. Effect

Active Publication Date: 2016-06-08
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention aims at the defects of weak interfacial interaction and low thermal conductivity of existing carbon fiber / silicon carbide composite materials, and provides a method for improving interfacial interaction and thermal conductivity of carbon fiber / silicon carbide composite materials

Method used

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  • Preparation method of high-temperature-resistant oxidation-resistant heat-conducting carbon fiber/silicon carbide composite material
  • Preparation method of high-temperature-resistant oxidation-resistant heat-conducting carbon fiber/silicon carbide composite material
  • Preparation method of high-temperature-resistant oxidation-resistant heat-conducting carbon fiber/silicon carbide composite material

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Experimental program
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Effect test

Embodiment 1

[0032] After cleaning and drying the carbon fiber fabric, it is placed in a tube furnace, heated to 700°C at a rate of 5°C / min under Ar atmosphere, and kept at a constant temperature for 0.5h to remove the polymer coating on the surface of the carbon fiber fabric when it leaves the factory. Soak the degummed carbon fiber cloth in Fe(NO 3 ) 3 In solution. After soaking for 0.5h, take it out and dry it. The catalyst-supporting carbon fiber is woven and arranged in a tube furnace. Ar was introduced (flow rate is 200sccm), and the temperature was raised to 400°C at a rate of 5°C / min. Reduce Ar flow to 100sccm and pass H at the same time 2 (The flow rate is 200sccm). After 10min, increase the Ar flow to 350sccm and reduce H 2 The flow rate is 20sccm. The temperature is increased to 750°C at a rate of 5°C / min. A carbon source (ethanol:xylene=1:1) was introduced, the injection speed was 20ml / h, and the growth time was 10min. Close H after growth is over 2 Reduce the Ar flow rate ...

Embodiment 2

[0034] After cleaning and drying the carbon fiber fabric, it is placed in a tube furnace, heated to 750°C at a rate of 10°C / min under Ar atmosphere, and kept at a constant temperature for 1 hour to remove the polymer coating on the surface of the carbon fiber fabric when it leaves the factory. Soak the degummed carbon fiber cloth in Fe(NO 3 ) 3 In solution. After soaking for 1h, take it out and dry it. The catalyst-supporting carbon fiber is woven and arranged in a tube furnace. Ar was introduced (flow rate is 300sccm), and the temperature was increased to 450°C at a rate of 10°C / min. Reduce Ar flow rate to 150sccm while passing H 2 (The flow rate is 250sccm). After 20min, increase Ar flow to 380sccm and decrease H 2 The flow rate is 35sccm. The temperature is increased to 800°C at a rate of 10°C / min. A carbon source (ethanol:xylene=1:1) was introduced, the injection speed was 20ml / h, and the growth time was 30min. Close H after growth is over 2 Reduce the Ar flow rate to ...

Embodiment 3

[0036] After cleaning and drying the carbon fiber fabric, it is placed in a tube furnace, heated to 800°C at a rate of 15°C / min under Ar atmosphere, and kept at a constant temperature for 2 hours to remove the polymer coating on the surface of the carbon fiber fabric when it leaves the factory. Soak the degummed carbon fiber cloth in Fe(NO 3 ) 3 In solution. After soaking for 2h, take it out and dry it. The catalyst-supporting carbon fiber is woven and arranged in a tube furnace. Ar was introduced (flow rate is 400sccm), and the temperature was raised to 500°C at a rate of 15°C / min. Reduce Ar flow to 200sccm and pass H at the same time 2 (The flow rate is 300sccm). After 30min, increase Ar flow to 400sccm and decrease H 2 The flow rate is 50sccm. The temperature is increased to 850°C at a rate of 15°C / min. A carbon source (ethanol:xylene=1:1) was introduced, the injection speed was 20ml / h, and the growth time was 60min. Close H after growth is over 2 Reduce the Ar flow rat...

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Abstract

The invention relates to a preparation method of a high-temperature-resistant oxidation-resistant heat-conducting carbon fiber / silicon carbide composite material. The preparation method comprises the following steps: immersing carbon fiber fabrics in a Fe(NO3)3 solution, and drying; putting the catalyst-carried carbon fiber fabrics in a tube furnace; introducing Ar and H2; introducing a carbon source, and obtaining the carbon-nanotube-grown carbon fiber fabrics after the growth finishes; laminating 4-8 carbon fiber fabrics, and immersing in a polycarbosilane dimethylbenzene solution; taking out the laminated carbon fiber fabrics, and drying to form a block; carrying out oxidation in a muffle furnace for 1-2 hours; and putting the block into the tube furnace, introducing Ar, heating to 1200 DEG C, and cooling to obtain the high-temperature-resistant oxidation-resistant heat-conducting carbon fiber / silicon carbide composite material. The carbon fiber / silicon carbide composite material has favorable mechanical properties: the bending strength can reach 115 MPa or above, and the compression strength can reach 450 MPa or above. The method is simple, and has the advantages of low cost and low energy consumption.

Description

Technical field [0001] The invention relates to a method for preparing a high-temperature resistant, oxidation-resistant and thermally conductive carbon fiber / silicon carbide composite material, in particular to a method for preparing a carbon fiber and silicon carbide composite material. 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 of electrical devices, the continuous increase of heat generation per unit area of ​​the electronic devices has caused the heat generated by the system to increase sharply. If there is no sufficient thermal management guarantee, it is very easy to cause the related devices to age or be damaged in advance. Traditional metal thermal conductive materials (such as aluminum, copper, etc.) have limitations due to their high de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/80C04B35/622
CPCC04B35/571C04B35/622C04B35/806C04B2235/483C04B2235/5248C04B2235/5256C04B2235/614C04B2235/616C04B2235/96C04B2235/9607
Inventor 封伟陈松超冯奕钰秦盟盟
Owner TIANJIN UNIV
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