Preparation method of blocky SiO2-Y2O3 compound aerogel

A composite airgel, sio2-y2o3 technology, applied in the field of preparation of bulk SiO2-Y2O3 composite airgel, can solve the problems of poor thermal stability at high temperature, and achieve the effect of improving thermal stability and performance

Active Publication Date: 2013-05-08
江苏安珈新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to improve the currently studied SiO 2 To provide a high temperature resistant bulk SiO 2 -Y 2 o 3 Preparation method of composite airgel

Method used

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  • Preparation method of blocky SiO2-Y2O3 compound aerogel

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example 1

[0021] Tetraethyl orthosilicate, hydrochloric acid, deionized water, and absolute ethanol were mixed in a molar ratio of 1:0.1:8:10 at 45°C and stirred for 90 minutes to obtain a clear transparent solution. Then add yttrium chloride hexahydrate to the clear solution according to the molar ratio of tetraethylorthosilicate and yttrium chloride hexahydrate at 1:0.05, and continue to stir evenly at 60°C for 120 minutes to obtain a colorless transparent solution. Finally, add ammonia water to the colorless transparent solution and adjust the pH value of the mixed solution to 6.8 to obtain SiO 2 -Y 2 o 3 Composite sol solution. SiO will be obtained 2 -Y 2 o 3 Pour the composite sol solution into the mold and place it in an oven at 40°C for 3 hours to react at a constant temperature to obtain SiO 2 -Y 2 o 3 Composite wet gel. Then add ethanol aging solution to the sample in the mold for aging treatment, solvent replacement 3 times, each 24h, and finally get block SiO 2 -Y ...

example 2

[0023] Tetraethyl orthosilicate, hydrochloric acid, deionized water, and absolute ethanol were mixed in a molar ratio of 1:0.02:6:15 at 50°C and stirred for 120 minutes to obtain a clear transparent solution. Then add yttrium chloride hexahydrate to the clear solution according to the molar ratio of tetraethylorthosilicate and yttrium chloride hexahydrate at 1:0.03, and continue to stir evenly at 65°C for 100 minutes to obtain a colorless transparent solution. Finally, add ammonia water to the colorless transparent solution and adjust the pH value of the mixed solution to 7.5 to obtain SiO 2 -Y 2 o 3 Composite sol solution. SiO will be obtained 2 -Y 2 o 3The composite sol solution was poured into the mold and placed in a 40°C oven for constant temperature reaction for 1h to obtain SiO 2 -Y 2 o 3 Composite wet gel. Then add ethanol aging solution to the sample in the mold for aging treatment, solvent replacement 5 times, each 12h, and finally get block SiO 2 -Y 2 o ...

example 3

[0025] Tetraethyl orthosilicate, hydrochloric acid, deionized water, and absolute ethanol were mixed in a molar ratio of 1:0.2:10:20 at 30°C and stirred for 30 minutes to obtain a clear transparent solution. Then add yttrium chloride hexahydrate to the clear solution according to the molar ratio of tetraethylorthosilicate and yttrium chloride hexahydrate at 1:0.005, and continue to stir evenly at 70°C for 80 minutes to obtain a colorless transparent solution. Finally, add ammonia water to the colorless transparent solution and adjust the pH of the mixed solution to be 8 to obtain SiO 2 -Y 2 o 3 Composite sol solution. SiO will be obtained 2 -Y 2 o 3 Pour the composite sol solution into the mold and place it in an oven at 30°C for 5 hours to react at a constant temperature to obtain SiO 2 -Y 2 o 3 Composite wet gel. Then add acetone aging solution to the sample in the mold for aging treatment, solvent replacement 4 times, 24 hours each time, and finally obtain block Si...

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Abstract

The invention relates to a preparation method of a blocky SiO2-Y2O3 compound aerogel. The preparation method comprises the steps of: uniformly mixing tetraethyl orthosilicate, an acid catalyst, deionized water, absolute ethyl alcohol, yttrium chloride hexahydrate, ammonia water and the like to obtain a colorless clear SiO2-Y2O3 compound sol solution, drying to obtain a compound wet gel, carrying out solvent replacement on the compound wet gel and then drying to obtain the blocky SiO2-Y2O3 compound aerogel. The high-temperature thermal stability performance of a SiO2 aerogel material is improved by adopting a rare earth element doping mode so that the prepared SiO2-Y2O3 compound aerogel has all excellent characteristics of the original SiO2 aerogel, and has the advantages of higher temperature use range, complex structure, high specific area, low heat conductivity, low density and the like. The preparation method is simple and easy to operate, has the profound significance for improving the high-temperature thermal stability of the widely applied SiO2 aerogel material, and provides a new idea for improving the performance of the aerogel material.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nanocomposite materials with high temperature and heat insulation characteristics, and in particular relates to a block SiO 2 -Y 2 o 3 Preparation method of composite airgel. Background technique [0002] Airgel is a three-dimensional nano-network structure composed of colloidal particles or polymer molecules, and is a new type of porous material. Airgel materials have the characteristics of high specific surface area, high porosity, low refractive index, ultra-low density, super adsorption, etc., so they have broad application prospects in thermal, optical, electrical, acoustic and other aspects. Especially in terms of heat, the nanoporous network structure of airgel can effectively inhibit solid-phase heat transfer and gas-phase heat transfer, and has excellent thermal insulation characteristics. It is currently the solid material with the lowest thermal conductivity in the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/00
Inventor 沈晓冬张君君崔升仲亚
Owner 江苏安珈新材料科技有限公司
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