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A kind of high-texture carbon-based composite material and preparation method thereof

A composite material and high-texture technology, which is applied in the field of high-texture carbon-based composite materials and preparation, can solve the problems of difficult preparation of high-textured pyrolytic carbon, high degree of pyrolytic carbon texture, and shortened preparation cycle. Achieve the effect of shortening the preparation cycle, excellent performance and improving the degree of texture

Active Publication Date: 2018-01-19
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a high-textured carbon-based composite material and a preparation method to solve the problems of difficulty and long preparation period of existing high-textured pyrolytic carbon, not only to make pyrolytic carbon texture High degree of simplification, shortening the preparation cycle, and the obtained composite material has excellent performance

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  • A kind of high-texture carbon-based composite material and preparation method thereof
  • A kind of high-texture carbon-based composite material and preparation method thereof

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preparation example Construction

[0027] The preparation method of this composite material comprises the following steps:

[0028] (1) Carbonization: Carbonize the prefabricated body prepared by PAN-based pre-oxidized wire in a high-temperature furnace, using argon as the protective atmosphere, where the argon pressure is 10-50kPa, the flow rate is 100L / h, and the carbonization temperature is 900-1300 °C, the carbonization time is 10-50 hours, and the volume fraction of fibers in the preform after carbonization is 30-40%.

[0029] (2) Graphitization: graphitize the carbonized preform in a high-temperature furnace with argon as a protective atmosphere at a temperature of 1600-2300° C. for 5-50 hours, and the pressure of the argon at 5-20 kPa.

[0030] (3) Densification: place the graphitized preform in a CVI vapor deposition furnace, use nitrogen as a protective atmosphere, evacuate to below 100pa, and raise the temperature at a constant rate of 100-200°C / h. When the CVI vapor deposition furnace When the tempe...

Embodiment 1

[0037] Take the prefabricated body made of domestic PAN-based pre-oxidized wire as an example.

[0038] (1) Carbonization: Carbonize the prefabricated body prepared by domestic PAN-based pre-oxidized wire in a high-temperature furnace, using argon as the protective atmosphere, in which the flow rate of argon gas is 100L / h, the pressure is 50kPa, and the carbonization temperature is 1100°C. The time is 20 hours, and the prefabricated fibers account for 40% of the volume fraction of the prefabricated body after carbonization.

[0039] (2) Graphitization: graphitize the carbonized preform in a high-temperature furnace with argon as a protective atmosphere at a temperature of 2300° C. for 15 hours, and the pressure of argon at 10 kPa.

[0040](3) Densification: Place the prefabricated body in a CVI vapor deposition furnace, use nitrogen as a protective atmosphere, evacuate to below 100pa, and raise the temperature at a constant rate of 200°C / h. When the temperature in the CVI vapo...

Embodiment 2

[0047] (1) Carbonization: Carbonize the domestic PAN-based pre-oxidized wire preform in a high-temperature furnace, using argon as the protective atmosphere, in which the argon flow rate is 100L / h, the air pressure is 10kPa, the carbonization temperature is 1200°C, and the carbonization time is 35h, the preform volume fraction after carbonization is 35%.

[0048] (2) Graphitization: graphitize the carbonized preform in a high-temperature furnace, using argon as a protective atmosphere at a temperature of 2100° C. for 20 hours, and the pressure of the argon at 20 kPa.

[0049] (3) Densification: Place the preform in a CVI vapor deposition furnace, use nitrogen as a protective atmosphere, evacuate to below 100pa, and raise the temperature at a constant rate of 150°C / h. When the temperature in the CVI vapor deposition furnace rises to 1100°C At this time, the methane and ethylene are respectively fed into the CVI vapor deposition furnace with a flow meter, the liquid naphthalene ...

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Abstract

The invention relates to a high-texture carbon-based composite and a preparation method. The composite comprises a carbon matrix and a preform prepared from PAN (polyacrylonitrile)-based preoxidative fibers. The preparation method of the composite comprises the steps: preform carbonization, graphitization and densification, wherein the densification adopts step-by-step densification by taking methane, ethylene and naphthaline as carbon sources, the step-by-step densification comprises three stages including 0-70h, 70-120h and 120-150h, the densification temperature, air pressure and the flow ratio of methane, ethylene and naphthaline in the carbon sources at each stage are controlled, so that pyrolytic carbon with the highest texturing degree is formed on the surface of the preform. The preparation method has the advantages of greatly shortening the composite preparation cycle and improving the texturing degree and the methane recovery rate; besides, the prepared carbon-based composite has outstanding performance.

Description

technical field [0001] The invention relates to the technical field of high-temperature structural composite materials, in particular to a high-texture carbon-based composite material and a preparation method thereof. Background technique [0002] Due to their excellent performance, carbon-based composites have been widely used in civil and military fields, especially in aerospace as high-temperature structural materials. The preparation of carbon-based composite materials requires the densification of the preform, that is, the use of carbon source precursors to form pyrolytic carbon on the surface of the preform, thereby filling the voids of the preform and realizing the densification of the preform. Therefore, the structure of pyrolytic carbon directly affects the carbon matrix. Among various pyrolytic carbon types, high-textured pyrolytic carbon has the advantages of high density, high thermal conductivity, high strength and stable friction coefficient. [0003] Preform ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/622
CPCC04B35/622C04B35/83C04B2235/614C04B2235/77
Inventor 罗瑞盈李杨
Owner BEIHANG UNIV
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