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Preparation method of heat insulation-bearing integrated light carbon-based composite material

A carbon-based composite material, lightweight technology, used in ceramic products, other household appliances, household appliances, etc., can solve the problems of matrix stress concentration, material delamination, cracking, etc., to solve the problem of poor shrinkage matching and improve intrinsic strength. , the effect of rapid preparation

Active Publication Date: 2021-12-31
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

However, the above-mentioned fiber reinforcement hardly undergoes volume deformation during the entire preparation process, while the organic airgel matrix generally undergoes 20-30% linear shrinkage during the carbonization process, and the shrinkage mismatch between the two will lead to matrix stress concentration, Poor bonding of the fiber / matrix interface, and even material delamination, cracking and other problems, which seriously restrict the strengthening and toughening effect of the fiber and the preparation of large-scale components of the material

Method used

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  • Preparation method of heat insulation-bearing integrated light carbon-based composite material
  • Preparation method of heat insulation-bearing integrated light carbon-based composite material
  • Preparation method of heat insulation-bearing integrated light carbon-based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Mix phenolic resin, cyclohexane, and benzenesulfonyl chloride uniformly in a mass ratio of 3:4:0.1; place the original phenolic fiber mat in a 100g / L sodium hydroxide aqueous solution for activation treatment, and the activation treatment temperature is 90°C , the holding time is 10h; the activated phenolic fiber felt is washed 3 times with deionized water to remove the residual sodium hydroxide on the surface of the fiber; the cleaned phenolic fiber felt is dried in an oven at a drying temperature of 60°C and kept warm The time is 24h; under the atmospheric pressure of 1.0MPa, introduce the mixed solution into the mold equipped with activated phenolic fiber felt, and keep the pressure for 2h; 200°C, holding time 5h, to obtain phenolic fiber-reinforced phenolic organic wet gel; after demoulding, dry in an oven at 150°C under normal pressure for 3 days to obtain phenolic fiber-reinforced phenolic organic xerogel; phenolic fiber-reinforced The phenolic organic xerogel was...

Embodiment 2

[0040] Mix phenolic resin, acetone, and hexamethylenetetramine evenly in a mass ratio of 3:5:0.05; place the original phenolic fiber mat in a 100g / L sodium hydroxide aqueous solution for activation treatment, and the activation treatment temperature is 95 ℃, the holding time is 24h; the activated phenolic fiber felt is washed 5 times with deionized water to remove the residual sodium hydroxide on the fiber surface; the cleaned phenolic fiber felt is dried in an oven at a drying temperature of 70°C. The holding time is 12 hours; under the atmospheric pressure of 2.0MPa, introduce the mixed solution into the mold equipped with activated phenolic fiber felt, and keep the pressure for 1 hour; then place the impregnated activated phenolic fiber in the reaction kettle to heat up and cure The temperature is 180°C, and the holding time is 10h to obtain phenolic organic wet gel reinforced with phenolic fiber; after demolding, dry in a drying oven at 120°C under normal pressure for 2 day...

Embodiment 3

[0042] Phenolic resin, xylene, and sodium carbonate are uniformly mixed in a mass ratio of 3:7:0.1; the original phenolic fiber felt is activated in a 100g / L sodium hydroxide aqueous solution, and the activation temperature is 90°C. for 12 hours; wash the activated phenolic fiber felt with deionized water three times to remove residual sodium hydroxide on the fiber surface; dry the cleaned phenolic fiber felt in an oven at a drying temperature of 80°C and a holding time of 12 hours ;Under the atmospheric pressure of 3.0MPa, introduce the mixed solution into the mold equipped with activated phenolic fiber felt, and keep the pressure for 1h; then place the impregnated activated phenolic fiber in the reaction kettle to heat up and cure, and the curing temperature is 160°C. The holding time is 12 hours to obtain phenolic fiber-reinforced phenolic organic wet gel; after demolding, dry in a drying oven at 150°C under normal pressure for 7 days to obtain phenolic fiber-reinforced phen...

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Abstract

The invention discloses a preparation method of a heat insulation-bearing integrated light carbon-based composite material, and belongs to the technical field of fiber reinforced porous carbon preparation. The method comprises the following steps: 1) preparing a linear phenolic resin reaction solution; 2) carrying out surface activation treatment on the phenolic fibers; 3) impregnating and activating the phenolic fiber felt; 4) carrying out cross-linking and curing; 5) carrying out normal pressure drying; and 6) carrying out carbonization The linear phenolic resin which is relatively low in price is used for replacing a small molecular monomer to serve as a synthesis raw material of the nano-porous carbon. The activated phenolic aldehyde organic felt is adopted to replace the traditional carbon fiber felt to serve as a novel reinforcement of the nanopore carbon matrix, and a complicated solvent replacement step is not needed; instead, the preparation of the light, high-strength, low-thermal-conductivity and large-size nanopore carbon-based composite material is realized through normal pressure drying. The material has excellent high-temperature size stability and ultrahigh-temperature heat insulation performance, and is expected to be used as a novel rigid heat insulation material to be applied to the field of aerospace heat protection with the ultrahigh-temperature-resistant, heat-insulation and bearing integrated requirements.

Description

technical field [0001] The invention relates to the technical field of preparation of fiber-reinforced porous carbon, in particular to a method for preparing a heat-insulating-carrying integrated lightweight carbon-based composite material. Background technique [0002] The new nanoporous carbon is a new type of lightweight carbon material formed by the carbonization of organic airgel. It has the characteristics of high porosity, large specific surface area, and low thermal conductivity. Rigid heat insulation material can still maintain its mesoporous structure under the inert atmosphere of 2800 ℃, and can be used as a heat insulation material for a long time above 2200 ℃. The nanoporous three-dimensional network structure formed by stacking nano-carbon particles can effectively reduce solid, gaseous and radiative heat conduction, and its thermal insulation performance is significantly better than traditional high-temperature thermal insulation materials such as ceramic fibe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/83C04B35/52C04B35/622
CPCC04B38/067C04B35/83C04B35/52C04B35/622C04B2235/6562C04B2235/6567C04B2235/96C04B2235/9607C04B2235/77C04B2235/658C04B38/0067
Inventor 汤素芳李建郭鹏磊胡成龙庞生洋赵日达马健
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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