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Preparation method of carbon/carbon composite material with high heat conductivity

A carbon composite material, high thermal conductivity technology, applied in the fields of carbon compounds, chemical instruments and methods, inorganic chemistry, etc. Weaving and forming three-dimensional preforms, etc., to achieve the effects of high elongation at break, high modulus, and few fiber interlacing points

Active Publication Date: 2018-07-24
SHAANXI TIANCE NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high thermal conductivity (thermal conductivity greater than 500W / (m K)), the mesophase pitch-based carbon fiber has a high modulus (greater than 700GPa, even 935GPa), and a small elongation at break (generally 0.3-0.4%) , the weaving process is poor, and it is difficult to form a three-dimensional prefabricated body by weaving, which makes the large-volume and mass production of high thermal conductivity carbon / carbon composite materials more difficult

Method used

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  • Preparation method of carbon/carbon composite material with high heat conductivity
  • Preparation method of carbon/carbon composite material with high heat conductivity
  • Preparation method of carbon/carbon composite material with high heat conductivity

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preparation example Construction

[0027] The preparation method of the high thermal conductivity carbon / carbon composite material in the present invention is as follows: select mesophase pitch-based carbon fibers with special properties, weave to obtain a three-dimensional prefabricated body, and carry out three-dimensional prefabricated body through repeated chemical vapor infiltration or liquid phase impregnated carbonization Densify until the density reaches 1.8-2.2g / cm 3 ; The final product is subjected to high-temperature graphitization treatment at 2600-3000 ° C to obtain a high thermal conductivity carbon / carbon composite material.

[0028] Specifically include the following steps:

[0029] (1) Choice of enhancer

[0030] Directly select mesophase pitch-based carbon fibers with a modulus less than 220GPa, a strength greater than 1600MPa, and a thermal conductivity greater than 500W / (m·K) after heat treatment at 2600°C. Alternatively, the mesophase pitch-based carbon fibers are prepared by pre-oxidizin...

Embodiment 1

[0045] 1) Select mesophase pitch-based carbon fibers with a modulus of 200GPa, a strength of 1600MPa, and a thermal conductivity of 600W / (m K) after heat treatment at 2600°C. The linear density is 0.46g / m, and the bulk density is 2.04g / cm 3 ;

[0046] 2) Weave the above-mentioned mesophase pitch-based carbon fiber into unidirectional carbon cloth with an area density of 153g / m 2 ;

[0047] 3) Cutting 50×100mm 2 33 pieces of unidirectional carbon cloth were laminated in parallel, and fixed to a thickness of 5 mm with a graphite mold with holes to obtain a three-dimensional prefabricated body with a fiber volume fraction of 50%, such as figure 1 shown;

[0048] 4) Put the three-dimensional preform into a chemical vapor deposition furnace, introduce high-textured pyrolytic carbon into the preform with ethanol as the carbon source for repeated densification, and finally obtain a density of 1.98g / cm 3 carbon / carbon composite material precursor;

[0049] 5) The carbon / carbon ...

Embodiment 2

[0051]1) Select a mesophase pitch-based carbon fiber with a modulus of 220GPa, a strength of 1800MPa, and a thermal conductivity of 550W / (m K) after heat treatment at 2600°C, with a linear density of 0.47g / m and a bulk density of 2.09g / cm 3 ;

[0052] 2) Weave the above-mentioned mesophase pitch-based carbon fiber into unidirectional carbon cloth with an area density of 157g / m 2 ;

[0053] 3) Cutting 50×100mm 2 and 100×50mm 2 A total of 37 pieces of unidirectional carbon cloth were laminated orthogonally, and each layer was evenly sprinkled with mesophase pitch powder passing through a 200-mesh sieve to obtain a three-dimensional prefabricated body, such as figure 2 shown;

[0054] 4) Put the above-mentioned three-dimensional prefabricated body into a vacuum hot-press furnace for hot-press molding to obtain a carbon / carbon composite material intermediate with a thickness of 5mm and a fiber volume fraction of 55%;

[0055] 5) Carry out 2000°C carbonization treatment on ...

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Abstract

The invention provides a preparation method of a carbon / carbon composite material with high heat conductivity. The preparation method comprises the steps: adopting an intermediate-phase asphalt-basedcarbon fiber with special property to carry out weaving, obtaining a three-dimensional preform, and carrying out densification and final graphitizing treatment, to obtain the carbon / carbon composite material with high heat conductivity. The preparation method comprises the following specific steps: (1) selecting the carbon / carbon composite material with low modulus, intermediate strength, high elongation at break, better weaving processability and high heat conductivity potential to carry out weaving, so as to obtain the three-dimensional preform; (2) introducing a carbon source into the three-dimensional preform to carry out densification so as to obtain the carbon / carbon composite material; (3) carrying out graphitizing treatment on the carbon / carbon composite material so as to obtain the carbon / carbon composite material with high heat conductivity.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method of a high thermal conductivity carbon / carbon composite material. Background technique [0002] Carbon / carbon composite materials have a series of excellent properties such as high specific strength, high specific modulus, low density, anti-ablation, thermal shock resistance, high thermal conductivity, low expansion, etc., and have been widely used in aerospace fields, such as aircraft brake pads, missiles Nose cone, rocket engine nozzle throat liner, space shuttle nose cone and wing leading edge, etc., have broad development prospects. By selecting different reinforcements and changing the preparation process, high thermal conductivity carbon / carbon composite materials with extremely high thermal conductivity can be obtained, which is one of the most promising high thermal conductivity candidate materials at present. The graphite crys...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/52C01B32/205
CPCC04B35/522C04B35/83C04B2235/77C04B2235/9607
Inventor 黄立叶高峰阁康延涛孙海成张鸿翔
Owner SHAANXI TIANCE NEW MATERIAL TECH
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