Composition, porous carbon fiber thermal insulation material high-surface-emissivity anti-oxidation coating prepared from composition and preparation method of porous carbon fiber thermal insulation material high-surface-emissivity anti-oxidation coating

A technology of porous carbon fiber and anti-oxidation coating, which is applied in applications, ceramic products, household appliances, etc., can solve the problems of lowering the coating formation temperature, and achieve the effects of lowering the sintering temperature, improving the attenuation of radiation performance, and lowering the preparation temperature

Active Publication Date: 2019-03-15
BEIJING JIAOTONG UNIV
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  • 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, porous carbon fiber thermal insulation material high-surface-emissivity anti-oxidation coating prepared from composition and preparation method of porous carbon fiber thermal insulation material high-surface-emissivity anti-oxidation coating
  • Composition, porous carbon fiber thermal insulation material high-surface-emissivity anti-oxidation coating prepared from composition and preparation method of porous carbon fiber thermal insulation material high-surface-emissivity anti-oxidation coating
  • Composition, porous carbon fiber thermal insulation material high-surface-emissivity anti-oxidation coating prepared from composition and preparation method of porous carbon fiber thermal insulation material high-surface-emissivity anti-oxidation coating

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preparation example Construction

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

[0066] (1) Preparation of slurry for brushing

[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 suitable viscosity, the usage amount of the organic solvent satisfies the following conditions: mixing the organic solvent and polycarbosilane The mass percentage content of polycarbosilane in the solution is 5 to 30%, for example, 5%, 10%, 15%, 20%, 25% or 30%.

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

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

Embodiment 1

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

[0084] (2) The porous carbon fiber thermal insulation material was cut into 3.0cm×3.0cm×1.0cm fiberboard, and polished with 500-mesh, 1000-mesh, 2000-mesh, and 3000-mesh SiC sandpaper, ultrasonically cleaned for 20min, and dried in an oven at 80°C for later use.

[0085] (3) grinding the polycarbosilane into powder, dissolving the ground polycarbosilane (PCS) powder into a xylene solution to prepare a PCS solution, and the PCS content in the solution is 10% (mass percentage); Hafnium Boride (HfB 2 ), molybdenum silicide (MoSi 2 ), silicon carbide (S...

Embodiment 2

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

[0090] (2) The porous carbon fiber thermal insulation material was cut into 3.0cm×3.0cm×1.0cm fiberboard, and polished with 500-mesh, 1000-mesh, 2000-mesh, and 3000-mesh SiC sandpaper, ultrasonically cleaned for 20min, and dried in an oven at 80°C for later use.

[0091] (3) grinding the polycarbosilane into powder, dissolving the ground polycarbosilane (PCS) powder into a xylene solution to prepare a PCS solution, and the PCS content in the solution is 10% (mass percentage); Hafnium Boride (HfB 2 ), molybdenum silicide (MoSi 2 ), silicon carbide (SiC...

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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 insulating materials, in particular to a composition, a high emissivity anti-oxidation coating on the surface of a porous carbon fiber heat insulating material prepared by using the composition, and a preparation method thereof. Background technique [0002] Carbon fiber bonded carbon fiber composites are a kind 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 making the matrix or skeleton of lightweight thermal insulation and ablation-resistant heat-resistant materials. It is also a widely used 2000 Insulation material in an 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 Applications(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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