Composite aerogel thermal insulation material as well as preparation method and application thereof

A technology of composite aerogel and thermal insulation material, which is applied in the field of composite aerogel thermal insulation material and its preparation, and can solve the problems of volume shrinkage, skeleton structure destruction, nanopore structure destruction and the like
CN112456961AActive Publication Date: 2021-03-09南京龙宇光电材料科技有限公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
南京龙宇光电材料科技有限公司
Publication Date
2021-03-09

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Abstract

The invention relates to the technical field of thermal insulation materials for aerospace, and provides a composite aerogel thermal insulation material as well as a preparation method and applicationthereof. The preparation method comprises the following steps: mixing SiO2 aerogel and Al2O3 aerogel, grinding, mixing the mixed powder with water, and carrying out thermocuring in a mold to obtain acomposite aerogel thermal insulation material, wherein the SiO2 aerogel and the Al2O3 aerogel are prepared by adopting an improved sol-gel method. By doping the Al2O3 aerogel with the SiO2 aerogel, contact points among Al2O3 aerogel particles are reduced, and surface / body diffusion is inhibited, so that high-temperature sintering and alpha conversion of Al2O3 are inhibited, and the purpose of improving the high-temperature resistance and the heat insulation performance of Al2O3 is achieved. When the composite aerogel thermal insulation material is used for thermal insulation, the external temperature of the thermal insulation material is lower than 200 DEG C under the conditions that the internal temperature is 1200 DEG C and the thickness of the thermal insulation material is 1 cm, and the aviation thermal insulation requirement can be met.
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Description

technical field

[0001] The invention relates to the technical field of thermal insulation materials for aerospace, in particular to a composite airgel thermal insulation material and its preparation method and application. Background technique

[0002] With the rapid development of the aerospace industry, the requirements for thermal insulation materials in aerospace vehicles are getting higher and higher. Due to its high porosity and nano-sized porous structure, airgel has extremely low thermal conductivity and excellent high temperature resistance, which can meet the increasingly demanding needs of the aerospace field.

[0003] Among many aerogels, aluminum oxide (Al 2 o 3 ) Airgel has the most outstanding high temperature resistance and heat insulation performance, and can be used as a heat insulation layer for aviation vehicles. However, when the working temperature exceeds 1000 °C, Al 2 o 3 The aerogel undergoes α-phase transition, leading to volume shrinkage and d...

Claims

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