Preparation method of high temperature-resistant alumina aerogel material

A technology of alumina aerogel and alumina sol is applied in the field of preparation of high temperature resistant alumina aerogel materials to achieve the effects of enhancing skeleton structure, improving temperature resistance and high transparency
CN103342537BActive Publication Date: 2015-04-08IBIH ADVANCED MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
IBIH ADVANCED MATERIALS CO LTD
Publication Date
2015-04-08

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Abstract

The invention relates to a preparation method of a high temperature-resistant alumina aerogel material. The technology comprises the processes of: preparing alumina sol by adopting an in situ generation method; innovatively leading in a modified liquid in a supercritical drying process by adopting the originated supercritical modifying technology in manners of ageing and solvent substitution, so as to obtain block aerogel which is high in mechanical strength and easy to process; carrying out pretreatment at high temperature of 1000 DEG C, and carrying out gas-phase modification of hexamethyl disilazane, so as to prepare the alumina aerogel of which the linear contraction is just 5% and the specific surface area can be up to 280 m<2> / g after high-temperature treatment at 1200 DEG C. By adopting the synthesis method, application of the alumina aerogel in high-temperature fields such as high-temperature catalysis, catalyst carriers and high-temperature heat insulation is greatly facilitated.
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Description

technical field

[0001] The invention belongs to the technical field of preparation of airgel materials, and relates to a preparation method of a high-temperature-resistant alumina airgel material. Background technique

[0002] As a nanoporous material with high porosity (>90%), high specific surface area, and low density, silica airgel has been successfully applied in Cherenkov detectors, super heat insulating materials, catalyst supports, etc. With the development of catalysis and thermal insulation fields, the demand for high temperature resistant aerogels is becoming more and more urgent. For example when dealing with gaseous emissions or catalytic combustion, certain catalytic reactions are carried out at temperatures above 1000°C. Another example is that when a supersonic vehicle travels through the atmosphere, due to the severe friction with the air, the heat-resistant temperature of the outer heat insulation material needs to reach 1200°C or even higher. Silica a...

Claims

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