Preparation method of SiC aerogel/ceramic coating structure integrated heat prevention and insulation composite material

A technology of ceramic coating and composite material is applied in the field of preparation of SiC aerogel/ceramic coating structure integrated anti-thermal insulation composite material, which can solve the problems of poor oxidation resistance, small block size, application obstacles, etc. Achieve high mechanical properties and high temperature resistance, improve material properties, and simple preparation methods

Active Publication Date: 2022-03-25
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its poor oxidation resistance and small block size, its application is greatly hindered and limited.

Method used

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  • Preparation method of SiC aerogel/ceramic coating structure integrated heat prevention and insulation composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Preparation of SiC airgel: Dissolve polycarbosilane and vinyl compound in an organic solvent to prepare a uniformly dispersed silicon carbide precursor solution with a concentration of 30wt%; add 0.8 wt% Karstedt catalyst catalyzes hydrosilylation reaction for 8 hours to obtain silicon carbide precursor gel; supercritically dry the silicon carbide precursor gel to obtain silicon carbide precursor aerogel; The precursor airgel is subjected to high-temperature heat treatment to obtain silicon carbide airgel. The heat treatment temperature is 1600°C and the holding time is 3h.

[0043] (2) ZrB 2 Preparation of high-temperature oxygen-consuming coating: ZrB 2 , SiC is mixed evenly according to the mass ratio of 2:1; the mixed powder and silica sol are mixed and stirred according to the mass ratio of 2:3 until the solid and liquid are uniform, and the coating slurry is obtained; the obtained coating slurry is sprayed with a spray gun After drying naturally on the surfa...

Embodiment 2

[0049] (1) Preparation of SiC airgel: Dissolve polycarbosilane and vinyl compound in an organic solvent to prepare a uniformly dispersed silicon carbide precursor solution with a concentration of 20wt%; add 0.8 wt% Karstedt catalyst catalyzes hydrosilylation reaction for 8 hours to obtain silicon carbide precursor gel; supercritically dry the silicon carbide precursor gel to obtain silicon carbide precursor aerogel; The precursor airgel is subjected to high-temperature heat treatment to obtain silicon carbide airgel. The heat treatment temperature is 1600°C and the holding time is 3h.

[0050] (2) ZrB 2 High temperature oxygen consumption coating, ZrO 2 The preparation of the high-temperature heat-shielding coating and the oxide high-radiation coating is the same as in Example 1.

[0051] High-strength SiC airgel with a thickness of 30mm, ZrB 2 High temperature oxygen consumption coating thickness is 100um, ZrO 2 High-temperature thermal insulation coating is 100um, and ox...

Embodiment 3

[0054] (1) Preparation of SiC airgel: Dissolve polycarbosilane and vinyl compound in an organic solvent to prepare a uniformly dispersed silicon carbide precursor solution with a concentration of 15wt%; add 0.8 wt% Karstedt catalyst catalyzes hydrosilylation reaction for 8 hours to obtain silicon carbide precursor gel; supercritically dry the silicon carbide precursor gel to obtain silicon carbide precursor aerogel; The precursor airgel is subjected to high-temperature heat treatment to obtain silicon carbide airgel. The heat treatment temperature is 1600°C and the holding time is 3h.

[0055] (2) ZrB 2 High temperature oxygen consumption coating, ZrO 2 The preparation of the high-temperature heat-shielding coating and the oxide high-radiation coating is the same as in Example 1.

[0056] High-strength SiC airgel with a thickness of 30mm, ZrB 2 High temperature oxygen consumption coating thickness is 100um, ZrO 2 High-temperature thermal insulation coating is 100um, and ox...

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Abstract

The invention belongs to the field of heat insulation materials, and discloses a preparation method of a SiC aerogel / ceramic coating structure integrated heat prevention and insulation composite material, the material is composed of four layers of structures, from a cold end face to a hot end face, the four layers of structures are high-strength SiC aerogel, a ZrB2 high-temperature oxygen consumption coating, a ZrO2 high-temperature heat insulation coating and an oxide high-radiation coating in sequence, therefore, the SiC aerogel / ceramic coating structure integrated heat prevention and insulation composite material is obtained. The material obtained by the technology has the advantages of excellent ablation resistance, excellent oxidation resistance, low density, high strength, low thermal conductivity, high temperature resistance of 1800 DEG C and the like.

Description

technical field [0001] The invention belongs to the field of heat insulation materials, and in particular relates to a preparation method of a SiC airgel / ceramic coating structure integrated anti-heat insulation composite material. Background technique [0002] With the development of aerospace technology, aerospace vehicles have higher and higher requirements for thermal protection systems. The service environment of aerospace vehicles is extremely severe, requiring them to be able to withstand high aerodynamic heating temperatures and pressures in an aerobic environment for a long time. Strength and impact resistance, etc., and can be washed by high temperature and strong airflow for a long time without oxidation and ablation. [0003] SiC airgel has low density, good high-temperature stability and good high-temperature resistance, and can be used for a long time in an inert atmosphere at 2000 ° C. It is the most potential new generation of ultra-high temperature thermal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89C04B35/571C04B35/624
CPCC04B41/89C04B41/52C04B41/009C04B35/571C04B35/624C04B2235/6567C04B2235/9607C04B41/507C04B41/4543C04B41/5042C04B41/4533C04B41/5027C04B41/0072
Inventor 闫森旺孙小飞王刚张雷李虹屿李红霞
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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