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Method for preparing silicon aluminum composite aerogel material with high temperature resistance and high formability

A technology of composite airgel and formability, which is applied in the field of preparation of silicon-aluminum composite airgel materials, and can solve the problems of difficult formability of airgel and shrinkage not mentioned

Active Publication Date: 2015-01-21
SHANGHAI GRAND SOUND BEYOND NOISE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2001, Tatsuro Horiuchi et al. prepared silicon-aluminum composite aerogels. Although the specific surface area can reach 150 m after treatment at 1200 ° C 2 / g, but shrinkage is still not mentioned
Afterwards, many domestic researchers also studied silicon-aluminum composite aerogels, but it is still difficult to prepare aerogels with high temperature resistance, small shrinkage and good formability.

Method used

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  • Method for preparing silicon aluminum composite aerogel material with high temperature resistance and high formability
  • Method for preparing silicon aluminum composite aerogel material with high temperature resistance and high formability
  • Method for preparing silicon aluminum composite aerogel material with high temperature resistance and high formability

Examples

Experimental program
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Effect test

Embodiment 1

[0025] First, take a certain amount of aluminum sec-butoxide and put it into a mixed solution of deionized water, acetone and ethanol, heat the solution to above 60°C through a heating device, stir at a constant temperature until it is clear, and cool the sol to room temperature to obtain Pure alumina sol. Wherein the mol ratio of aluminum sec-butoxide, ethanol, acetone and deionized water is 1:0:10:0.2, nitric acid is added in the above-mentioned prepared pure alumina sol, and then mixed with trimethylethoxysilane in a certain proportion Mix and stir thoroughly for 10 minutes, then add aniline, acetone and deionized water, and stir for another 20 minutes to obtain the silica-aluminum composite sol. The molar ratio of aluminum sec-butoxide, trimethylethoxysilane, nitric acid, acetone, aniline and deionized water is 1:0.1:0.003:0:1.5:0.

[0026] Cover the newly formed wet gel with a small amount of alcohol to age for 1 day, and then replace it with alcohol 3 times, each time f...

Embodiment 2

[0029] Put a certain amount of aluminum isopropoxide into a mixed solution of deionized water and ethanol, heat the solution to above 60°C through a heating device, stir at a constant temperature until it is clarified, and cool the sol to room temperature to obtain pure alumina Sol. Wherein the mol ratio of aluminum isopropoxide, ethanol and deionized water is 1:20:0, add nitric acid catalyst in the above-mentioned prepared pure alumina sol, then mix with trimethylmethoxysilane in a certain proportion, fully After stirring for 10 minutes, add aniline, acetone and deionized water, and stir for another 20 minutes to obtain the silica-aluminum composite sol. The molar ratio of aluminum isopropoxide, trimethylmethoxysilane, nitric acid, acetone, aniline and deionized water is 1:0.2:0.4:20:3:0.5.

[0030] Cover the newly formed wet gel with a small amount of alcohol to age for 1 day, and then replace it with alcohol 3 times, each time for 24 hours. Then prepare partially hydroly...

Embodiment 3

[0033] Take a certain amount of aluminum sec-butoxide and put it into the mixed solution of deionized water and isopropanol, raise the temperature of the solution to above 60°C through a heating device, stir at a constant temperature until it is clarified, and cool the sol to room temperature to obtain pure Alumina sol. Among them, the molar ratio of aluminum sec-butoxide, isopropanol and deionized water is 1:40:0.9, add hydrochloric acid catalyst to the above-mentioned prepared pure alumina sol, and then mix it with ethyl orthosilicate in a certain proportion, and fully stir After 8 minutes, add aniline, acetone and deionized water, and stir for another 20 minutes to obtain the silica-aluminum composite sol. The molar ratio of aluminum sec-butoxide, tetraethylorthosilicate, hydrochloric acid, acetone, aniline and deionized water is 1:0.05:0.2:2:0.28:1.5.

[0034] Cover the newly formed wet gel with a small amount of alcohol to age for 1 day, and then replace it with alcohol ...

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Abstract

The invention relates to a method for preparing a silicon aluminum composite aerogel material with high temperature resistance and high formability. The method comprises the following steps: preparing pure alumina sol on a water area heater at the temperature of over 60 DEG C, cooling and stirring until the solution restores to room temperature after the sol is clarified; adding a silicon precursor, a catalyst and other solvents into the solution, stirring for several minutes, and standing, wherein the obtained wet gel is subjected to aging modification and replacement of one part of hydrolyzed aluminum alkoxide solution; and finally, performing high-temperature superfluid modification and drying, thereby obtaining massive aerogel, and performing high-temperature treatment at the temperature of 1200 DEG C, thereby obtaining the silicon aluminum composite aerogel of which the linear shrinkage is less than 8 percent. According to the preparation method of the composite material, wide application of the high-temperature-resistant aerogel material in the fields of aerospace, military affairs and civil use is further accelerated.

Description

technical field [0001] The invention belongs to the technical field of preparation of airgel materials, and relates to a preparation method of a silicon-aluminum composite airgel material with high temperature resistance and good formability. Background technique [0002] Airgel is a nanoporous material with high porosity, high specific surface area and low density. Its unique nanostructure makes airgel a super insulating material with extremely low thermal conductivity. With the development of the aerospace industry, the demand for high-efficiency thermal insulation and lightweight thermal insulation materials is becoming more and more urgent. For example, the speed of today's supersonic aircraft (missiles, rockets, space shuttles, etc.) is getting faster and faster. When they travel through the atmosphere, they will rub against the air violently, and the heat-resistant temperature of the outer layer of anti-ablation heat insulation material needs to reach 1200 °C or even...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/00
CPCC04B30/00
Inventor 沈军王文琴祖国庆邹丽萍连娅张志华
Owner SHANGHAI GRAND SOUND BEYOND NOISE NEW MATERIAL
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