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Preparation method of whisker modified carbon/carbon composite material

A technology of carbon composite materials and modified carbon, which is applied in the field of carbon/carbon composite material preparation to achieve the effect of changing pyrolytic carbon nucleation, improving uniformity and dispersion, and uniform pore distribution

Active Publication Date: 2015-04-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For the carbon fiber prefabricated body of the full net tire, the technology of improving the pyrolytic carbon structure by adding inorganic whiskers has not been reported in the existing materials.

Method used

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  • Preparation method of whisker modified carbon/carbon composite material
  • Preparation method of whisker modified carbon/carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) SiO with a diameter of about 100 nm and a length of about 1 μm 2 Whiskers are evenly spread on the upper and lower surfaces of each layer of carbon fiber mesh with a fine-mesh sieve, and 15 layers of mesh are stacked layer by layer, and the layers of mesh are connected by acupuncture to prepare an initial density of 0.21g / cm 3 Full net tire carbon fiber prefabricated body, control SiO in the prefabricated body 2 The mass fraction of whiskers is 6%;

[0033] (2) Implement densification in a CVI furnace for 62 hours with propylene as the carbon source gas and nitrogen as the diluent gas;

[0034] (3) Carry out high-temperature graphitization heat treatment in a vacuum induction graphitization furnace for 1 hour, and control the temperature at 2300°C. The process is as follows: in a protective atmosphere, first raise the temperature from room temperature to 1800°C at a rate of 750°C / h, and then Raise the temperature at 19°C / h to 2000°C, then raise the temperature at ...

Embodiment 2

[0037] (1) SiO with a diameter of about 100 nm and a length of about 1 μm 2 Whiskers are evenly spread on the upper and lower surfaces of each layer of carbon fiber mesh with a fine-mesh sieve, and the 18 layers of mesh are stacked layer by layer, and the layers of mesh are connected by acupuncture to prepare an initial density of 0.23g / cm 3 Full net tire carbon fiber prefabricated body, control SiO in the prefabricated body 2 The mass fraction of whiskers is 7%;

[0038] (2) Implement densification in a CVI furnace for 65 hours with propylene as the carbon source gas and nitrogen as the diluent gas;

[0039](3) Perform high-temperature graphitization heat treatment in a vacuum induction graphitization furnace for 1.5 hours, and control the temperature at 2400°C. The process is as follows: in a protective atmosphere, first raise the temperature from room temperature to 1800°C at a rate of 800°C / h, and then Raise the temperature at 200°C / h to 2000°C, then raise the temperatur...

Embodiment 3

[0042] (1) SiO with a diameter of about 100 nm and a length of about 1 μm 2 Whiskers are evenly spread on the upper and lower surfaces of each layer of carbon fiber mesh with a fine-mesh sieve, and the 20 layers of mesh are stacked layer by layer, and the layers of mesh are connected by acupuncture to prepare an initial density of 0.3g / cm 3 Full net tire carbon fiber prefabricated body, control SiO in the prefabricated body 2 The mass fraction of whiskers is 8%;

[0043] (2) Using propylene as the carbon source gas and nitrogen as the diluent gas to implement densification in a CVI furnace for 70 hours;

[0044] (3) Carry out high-temperature graphitization heat treatment in a vacuum induction graphitization furnace for 1.5 hours, and control the temperature at 2400°C. The process is as follows: in a protective atmosphere, first raise the temperature from room temperature to 1800°C at a rate of 1000°C / h, and then Raise the temperature at 210°C / h to 2000°C, then raise the tem...

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Abstract

The invention relates to a carbon / carbon composite material and a preparation method thereof, in particular to a nano SiO2 whisker modified carbon / carbon composite material and a preparation method thereof. Nano SiO2 whiskers are uniformly dispersed on the surface of each layer of carbonfiber web, the carbonfiber webs are overlaid layer by layer and woven, and a carbon fiber preform is obtained; CVI (chemical vapor infiltration) treatment is performed; a carbon fibergreen body containing pyrolytic carbon is obtained; and finally, graphitization treatment is performed, and the whisker modified carbon / carbon composite material is obtained. The nano SiO2 whiskers are uniformly added to full-web carbon fiber felt, pyrolytic carbonnucleation and growth environment in the CVI process is changed, the pyrolytic carbon structure is improved, the performance of the carbon / carbon composite material is improved; and compared with an unmodified carbon / carbon composite material, the degree of graphitization is increased by 25%-30%, the thermal conductivity is improved by 24%-28%, and the resistivity is reduced by 12%-15%.

Description

technical field [0001] The present invention relates to a kind of preparation method of carbon / carbon composite material, especially a kind of nano SiO 2 Preparation method of whisker-modified carbon / carbon composite material. Background technique [0002] Carbon / carbon composite material is an advanced composite material with carbon fiber reinforced carbon matrix. It has a series of excellent properties such as light specific gravity, good high temperature stability, low thermal expansion coefficient, thermal shock resistance, ablation resistance and friction and wear performance. It has been widely used in aerospace, nuclear energy, chemical industry, machinery manufacturing and other fields. With the further deepening and expansion of the application field of carbon / carbon composite materials, higher requirements are put forward for its thermophysical properties, such as degree of graphitization, thermal conductivity and resistivity. Traditional carbon / carbon composite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/81C04B35/83C04B35/622
Inventor 张福勤夏莉红王星星郑吉祥
Owner CENT SOUTH UNIV
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