Preparation method of compact C/C composite material

A composite material and densification technology, applied in the field of C/C composite material and dense C/C composite material preparation, can solve the problems of high viscosity of resin solution, inability to densify fiber bundles, and inability to fill fiber filament voids, etc., and achieve low porosity , long service life, high density effect

Inactive Publication Date: 2017-11-24
SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If only the CVI process is used, due to the diffusion and penetration of gaseous molecules, the densification between the fiber filaments can be achieved, but the fiber bundles cannot be densified due to the "bottleneck effect"; if only the PIP process is used, d

Method used

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  • Preparation method of compact C/C composite material
  • Preparation method of compact C/C composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Prepare a 3D woven carbon fiber preform with a carbon fiber volume fraction of 37%;

[0017] (2) Put the preform into a vacuum chemical vapor deposition furnace, the pressure in the furnace is 1000Pa, the temperature is raised to 1000°C, methane and hydrogen are introduced, and the pyrolytic carbon produced by the decomposition of methane is infiltrated into the preform by chemical vapor infiltration , the deposition time is 120h, and the densification of carbon fiber filaments in the preform is realized, so that the preform becomes a C / C composite material skeleton, and the porosity of the C / C composite material skeleton is 20%;

[0018] (3) The thermosetting resin solution was impregnated into the C / C composite skeleton obtained in step (2) by using the precursor impregnation cracking method, and the glassy carbon matrix was obtained by high-temperature cracking in a vacuum furnace. The cracking temperature was 900°C. The thermosetting resin solution concentration...

Embodiment 2

[0021] (1) Prepare a 2.5D woven carbon fiber preform with a carbon fiber volume fraction of 45%;

[0022] (2) Put the preform into a vacuum chemical vapor deposition furnace with a pressure of 10 4 Pa, the temperature is raised to 1200°C, methane and hydrogen are introduced, and the pyrolytic carbon produced by the decomposition of methane is infiltrated into the preform by chemical vapor infiltration. Become a C / C composite material skeleton, and the porosity of the C / C composite material skeleton is 35%;

[0023] (3) The thermosetting resin solution was impregnated into the C / C composite skeleton obtained in step (2) by using the precursor impregnation cracking method, and the glassy carbon matrix was obtained by high-temperature cracking in a vacuum furnace. The cracking temperature was 1200°C. The thermosetting resin solution concentration described above is 50%, and the thermosetting resin is furan resin.

[0024] (4) Repeat the cycle step (3), and stop when the weight ...

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Abstract

The invention discloses a preparation method of a compact C/C composite material. The method includes: firstly preparing a 3D or 2.5D braided carbon fiber preform; then putting the preform into a vacuum chemical vapor deposition furnace, introducing methane and hydrogen, letting pyrolytic carbon produced by methane decomposition infiltrate the preform by chemical vapor infiltration to realize compaction of carbon fiber filaments within the preform, thus turning the preform into a C/C composite material skeleton; then infiltrating the obtained C/C composite material skeleton with a thermosetting resin solution by precursor infiltration and pyrolysis method, and conducting high temperature pyrolysis in a vacuum furnace to obtain a glass carbon matrix; and finally cycling the step (3) repeatedly, and stopping the operation when the weight gain rate of the material is lower than 1%, and finally conducting pyrolysis to obtain pyrolytic glass carbon filled among fiber bundles, thus realizing compaction of fiber bundles, and obtaining the compact C/C composite material. The material has the advantages of high density, low porosity, high specific strength, specific modulus, and good toughness, high compactness, wear resistance and long service life.

Description

technical field [0001] The invention relates to C / C composite materials, in particular to a method for preparing dense C / C composite materials, and belongs to the field of materials. Background technique [0002] Carbon / carbon composite material is a new type of high-temperature material with unique performance developed in the 1960s. It combines the excellent mechanical properties of fiber-reinforced composite materials and the excellent high-temperature performance of carbonaceous materials, and has high specific strength and specific modulus. It has a series of excellent properties such as good toughness, excellent strength retention at high temperature, creep resistance and thermal shock resistance. It is currently known as the most ideal high-temperature structural material under an inert atmosphere. Under certain conditions, carbon / carbon composite materials can be obtained by combining pyrolytic carbon with carbon fiber, and the chemical vapor infiltration (C VI) pro...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/524C04B35/64
CPCC04B35/524C04B35/64C04B35/83
Inventor 陈照峰汪洋
Owner SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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