Composition, high-emissivity anti-oxidation coating on the surface of porous carbon fiber heat insulating material prepared by using the composition and preparation method thereof

A technology of porous carbon fiber and anti-oxidation coating, used in applications, ceramic products, household appliances, etc., can solve problems such as reducing the coating formation temperature, and achieve the effect of reducing the sintering temperature, lowering the preparation temperature, and improving the attenuation of radiation performance.

Active Publication Date: 2020-05-29
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Polymer pyrolysis of SiC coating can significantly reduce the formation temperature of the coating, but there will be a large shrinkage during the pyrolysis process

Method used

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  • Composition, high-emissivity anti-oxidation coating on the surface of porous carbon fiber heat insulating material prepared by using the composition and preparation method thereof
  • Composition, high-emissivity anti-oxidation coating on the surface of porous carbon fiber heat insulating material prepared by using the composition and preparation method thereof
  • Composition, high-emissivity anti-oxidation coating on the surface of porous carbon fiber heat insulating material prepared by using the composition and preparation method thereof

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Experimental program
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preparation example Construction

[0065] Specifically, the preparation method comprises the following steps:

[0066] (1) Preparation of slurry for painting

[0067] The above-mentioned composition provided by the present invention is mixed with an organic solvent capable of dissolving polycarbosilane to prepare a slurry; in order to obtain a slurry with a suitable viscosity, the amount of the organic solvent used meets the following conditions: the organic solvent and polycarbosilane are mixed The mass percentage of polycarbosilane in the final solution is 5 to 30%, for example, it can be 5%, 10%, 15%, 20%, 25% or 30%.

[0068] The type of the organic solvent is not particularly limited in the present invention, but xylene or divinylbenzene is preferably used.

[0069] In the process of preparing the slurry, polycarbosilane (PCS) can be ground into powder, then dissolved in an organic solvent to prepare a PCS solution with a PCS content (mass percentage) of 5-30%, and then Add other components in the compos...

Embodiment 1

[0083] (1) Dissolve cerium nitrate in deionized water with magnetic stirring, and the concentration of cerium oxide is 0.5mol / L. Using citric acid as a catalyst, the molar ratio of cerium nitrate to citric acid is 1:2, and stirred in a water bath at 60°C for 3 hours to obtain a gel. The prepared gel was dried at 120°C for 12h, then calcined at 500°C for 2h, ball milled and sieved to obtain cerium oxide nanopowder.

[0084] (2) Cut the porous carbon fiber insulation material into 3.0cm×3.0cm×1.0cm fiberboard, and smooth it with 500 mesh, 1000 mesh, 2000 mesh, 3000 mesh SiC sandpaper, ultrasonic cleaning for 20min, and dry in an oven at 80°C for later use.

[0085] (3) Grinding polycarbosilane into powder, dissolving polycarbosilane (PCS) powder after grinding into xylene solution, and preparing PCS solution, the PCS content in the solution is 10% (mass percentage); Hafnium boride (HfB 2 ), molybdenum silicide (MoSi 2 ), silicon carbide (SiC), cerium oxide (CeO 2 ) into the ...

Embodiment 2

[0089] (1) Dissolve cerium nitrate in deionized water with magnetic stirring, and the concentration of cerium oxide is 1mol / L. Using citric acid as a catalyst, the molar ratio of cerium nitrate to citric acid is 1:2, and stirred in a water bath at 60°C for 4 hours to obtain a gel. The prepared gel was dried at 120°C for 12h, then calcined at 500°C for 2h, ball milled and sieved to obtain cerium oxide nanopowder.

[0090] (2) Cut the porous carbon fiber insulation material into 3.0cm×3.0cm×1.0cm fiberboard, and smooth it with 500 mesh, 1000 mesh, 2000 mesh, 3000 mesh SiC sandpaper, ultrasonic cleaning for 20min, and dry in an oven at 80°C for later use.

[0091] (3) Grinding polycarbosilane into powder, dissolving polycarbosilane (PCS) powder after grinding into xylene solution, and preparing PCS solution, the PCS content in the solution is 10% (mass percentage); Hafnium boride (HfB 2 ), molybdenum silicide (MoSi 2 ), silicon carbide (SiC), cerium oxide (CeO 2 ) into the po...

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Abstract

The invention relates to a composition, a porous carbon fiber thermal insulation material high-surface-emissivity anti-oxidation coating prepared from the composition and a preparation method of the porous carbon fiber thermal insulation material high-surface-emissivity anti-oxidation coating. The composition comprises the following ingredients: transition metal boride, refractory metal silicide,silicon carbide powder, polycarbosilane and cerium oxide. The preparation method comprises the following steps: preparing pulp; coating the pulp on a porous carbon fiber thermal insulation material; drying the porous carbon fiber thermal insulation material coated with the pulp, then performing thermal treatment on the dried porous carbon fiber thermal insulation material and sintering the porouscarbon fiber thermal insulation material after thermal treatment in sequence, so as to obtain the porous carbon fiber thermal insulation material high-surface-emissivity anti-oxidation coating. The composition is applied to preparation of the coating, so that the sintering temperature can be reduced; the prepared coating has the advantages of being comparatively high in emissivity, comparatively low in high temperature thermal conductivity and good in ultrahigh temperature stability. Therefore, the coating is hopefully applied to a thermal protection system of a hypersonic vehicle.

Description

technical field [0001] The invention relates to the technical field of ultra-high temperature heat insulation materials, in particular to a composition, a high-emissivity anti-oxidation coating on the surface of a porous carbon fiber heat insulation material prepared by using the composition, and a preparation method thereof. Background technique [0002] Carbon fiber bonded carbon fiber composites are a class of carbon / carbon composites with low density and high porosity. It has excellent properties such as high porosity, low density, low thermal conductivity, high temperature stability, etc. It is most suitable for the matrix or skeleton of lightweight heat insulation and ablation-resistant heat-resistant materials. It is also a widely used in 2000 Thermal insulation material in inert gas environment above ℃. [0003] Although carbon fiber bonded carbon fiber composites have excellent ultra-high temperature properties, such as high temperature mechanical properties, high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/87
CPCC04B41/009C04B41/5071C04B41/87C04B35/83C04B38/00C04B41/507C04B41/5059C04B41/5045C04B41/4983C04B41/4539C04B41/0072
Inventor 张如炳叶长收侯先波安志民
Owner BEIJING JIAOTONG UNIV
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