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Preparation method of low-density carbon fiber reinforced carbon aerogel composite material

A composite material and carbon airgel technology, which is applied in the direction of airgel preparation, carbon preparation/purification, chemical instruments and methods, etc., can solve the problems of composite material delamination, cracking, poor shrinkage matching between fiber and matrix, etc. Achieve the effect of simple equipment requirements, safe and simple operation, and excellent high-temperature heat insulation performance

Active Publication Date: 2021-12-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing low-density carbon fiber reinforced carbon airgel composites, that is, to use superelastic hybrid fiber felt as a new reinforcement of nanoporous carbon to solve the problem caused by poor shrinkage matching between fibers and matrix Composite material delamination, cracking and other issues

Method used

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  • Preparation method of low-density carbon fiber reinforced carbon aerogel composite material
  • Preparation method of low-density carbon fiber reinforced carbon aerogel composite material
  • Preparation method of low-density carbon fiber reinforced carbon aerogel composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Mix phenolic resin, ethylene glycol, hexamethylenetetramine, and deionized water uniformly in a mass ratio of 3:20:1:10; In the mold of the elastic hybrid fiber felt, and keep the pressure for 24h; continue to impregnate with 0.1MPa nitrogen atmosphere pressure for 6h, and then cure and keep it for 10h at the temperature of the furnace cavity at 180°C to obtain the phenolic wet gel reinforced by the hybrid fiber; Dry in a drying oven at 120°C under normal pressure for 10 hours to obtain hybrid fiber-reinforced phenolic aerogels; put the obtained super-elastic hybrid fiber-reinforced phenolic airgel into a carbonization furnace, and in an argon atmosphere at 5°C / min The rate of heating was raised to 650°C, and the carbon fiber-reinforced carbon airgel composite material was obtained after holding the temperature for 1 hour. The normal pressure drying line shrinkage of the carbon airgel composite prepared by the above process is 0.75%, and the bulk density is 0.16g / cm 3 ...

Embodiment 2

[0051] Mix phenolic resin, ethanol, benzenesulfonyl chloride, and deionized water uniformly in a mass ratio of 3:12:4:8; under an atmospheric pressure of 0.1MPa, introduce the mixed solution into a superelastic hybrid fiber mat In the mold, and the vacuum holding time is 24h; continue to impregnate with 5MPa nitrogen atmosphere pressure for 6h, and then cure and keep at 200℃ furnace temperature for 5h under 10MPa nitrogen atmosphere pressure to obtain hybrid fiber reinforced phenolic wet gel; After molding, dry in a drying oven at 100°C under normal pressure for 48 hours to obtain hybrid fiber-reinforced phenolic airgel; put the obtained super-elastic hybrid fiber-reinforced phenolic airgel into a carbonization furnace, and heat it at 6°C under an argon atmosphere. The temperature was raised to 900°C at a rate of 1 / min, and the carbon fiber-reinforced carbon airgel composite was obtained after holding for 2 hours. The atmospheric pressure drying line shrinkage rate of the carb...

Embodiment 3

[0054] Mix phenolic resin, isopropanol, p-toluenesulfonic acid, and deionized water uniformly in a mass ratio of 3:10:1:4; In the mold of the fiber felt, the vacuum holding time is 36h; the impregnation is continued at 4MPa nitrogen atmosphere pressure for 8h, and then cured at 6MPa nitrogen atmosphere pressure and 200°C oven temperature for 6h to obtain hybrid fiber reinforced phenolic wet gel; After demoulding, dry in a drying oven at 90°C under normal pressure for 48 hours to obtain a hybrid fiber-reinforced phenolic airgel; put the obtained super-elastic hybrid fiber-reinforced phenolic airgel into a carbonization furnace, and heat it at 6°C under an argon atmosphere. The temperature was raised to 900°C at a rate of 1 / min, and the carbon fiber-reinforced carbon airgel composite was obtained after holding for 2 hours. The atmospheric pressure drying line shrinkage rate of the carbon airgel composite material prepared by the above process is 1.39%, and the bulk density is 0....

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Abstract

The invention discloses a preparation method of a low-density carbon fiber reinforced carbon aerogel composite material, and belongs to the technical field of carbon aerogel preparation. The method comprises the following steps of: (1) preparing a phenolic resin reaction solution; (2) dipping a super-elastic hybrid fiber felt; (3) carrying out auxiliary dipping-curing; (4) drying at normal pressure; and (5) carrying out carbonizing. The super-elastic hybrid fiber felt instead of a traditional rigid carbon fiber felt is adopted as a novel reinforcement of nano-porous carbon. Based on the super-elastic characteristic of the hybrid fiber felt, synergistic shrinkage of the reinforcement and a matrix in the carbonization process is achieved, and the technical bottleneck that the fiber reinforcement and a porous organism can hardly shrink and be matched is broken through. The carbon aerogel composite material with low thermal conductivity, high toughness and large size is obtained, and the material has excellent high-temperature thermal insulation performance and is expected to be applied as a novel high-temperature thermal insulation material to the fields of high-end civil thermal insulation, aerospace thermal protection and the like.

Description

technical field [0001] The invention discloses a preparation method of a low-density carbon fiber reinforced carbon airgel composite material, belonging to the technical field of carbon airgel preparation. Background technique [0002] As a new type of nanomaterial, aerogel has been widely concerned and has broad application prospects in many fields. Thermal materials and other fields. Among the various types of aerogels that have been developed, carbon aerogels have high thermal stability and can still maintain a mesoporous structure in an inert atmosphere of 2800 ° C. As a heat insulating material, the temperature can reach above 2200 ° C ( vacuum or inert atmosphere). In addition, due to its unique nanopore size and nanoparticle three-dimensional skeleton structure, carbon aerogel can effectively reduce solid, gaseous, and radiative thermal conductivity, and its thermal insulation performance is superior to traditional high-temperature insulation materials. Therefore, ...

Claims

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Application Information

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IPC IPC(8): C04B30/02C01B32/05B01J13/00
CPCC04B30/02C01B32/05B01J13/0091C04B2201/20C04B2201/32C04B2201/50C04B14/386
Inventor 汤素芳李建郭鹏磊庞生洋胡成龙
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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