Block alumina aerogel with high temperature resistance and high specific surface area and preparation method thereof

A technology of alumina airgel and high specific surface area, which is applied to ceramic products, other household appliances, household appliances, etc., can solve the problems of high price, many influencing factors, and complicated preparation process, and achieve high specific surface area and high temperature resistance Good performance and large specific surface area

Inactive Publication Date: 2011-08-10
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the problems that these methods exist is that the salt it adopts is alkoxide, which is expensive compared with inorganic salts and is not conducive to large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The steps of the preparation method of a high-temperature-resistant high-specific-surface-area massive alumina airgel described in the present invention are as follows:

[0017] (1) Preparation of alumina sol: weigh 3.1g AlCl 3 ·6H 2 O is the precursor of alumina airgel, 0.06g YCl 3 ·6H 2 O is an additive, put it in a 100ml beaker, add 1ml (0.017mol) of absolute ethanol and 0.5ml (0.028mol) of deionized water, and stir fully at 5°C to dissolve the aluminum salt. After a colorless and transparent solution is formed, drop in 1.32ml (0.02mol) of propylene oxide was stirred and dispersed evenly to obtain alumina sol.

[0018] (2) Aging and replacement: put the alumina sol obtained in step (1) at room temperature for 2 hours to form a gel, then add absolute ethanol for aging and replacement, and the amount of absolute ethanol can be filled with the alumina sol. The aging and replacement time was 5 days, and the absolute ethanol impregnated with alumina sol was replaced 3...

Embodiment 2

[0022] The steps of the preparation method of a high-temperature-resistant high-specific-surface-area massive alumina airgel described in the present invention are as follows:

[0023] (1) Preparation of alumina sol: weigh 3.1g AlCl 3 ·6H 2 O is the precursor of alumina airgel, 0.32g YCl 3 ·6H 2 O is an additive, put it in a 100ml beaker, add 2.62ml (0.046mol) of absolute ethanol and 1.1ml (0.059mol) of water, stir fully at 15°C to dissolve the aluminum salt, and after a colorless and transparent solution is formed, drop 2.65 ml (0.04mol) of propylene oxide, stirred and dispersed evenly to obtain alumina sol.

[0024] (2) Aging and replacement: put the alumina sol obtained in step (1) at room temperature for 2 hours to form a gel, then add absolute ethanol for aging and replacement, and the amount of absolute ethanol can be filled with the alumina sol. The aging and replacement time was 2 days, during which the absolute ethanol impregnated with alumina sol was replaced twi...

Embodiment 3

[0028] The steps of the preparation method of a high-temperature-resistant high-specific-surface-area massive alumina airgel described in the present invention are as follows:

[0029] (1) Preparation of alumina sol: weigh 3.1g AlCl 3 ·6H 2 O is the precursor of alumina airgel, 0.0925g YCl 3 ·6H 2 O is the additive, put it in a 100ml beaker, add 1ml (0.017mol) of absolute ethanol and 1ml (0.056mol) of deionized water, and stir fully at 10°C to dissolve the aluminum salt. After a colorless and transparent solution is formed, drop 2ml ( 0.03mol) of propylene oxide, stirred and dispersed evenly to obtain alumina sol.

[0030] (2) Aging and replacement: the alumina sol obtained in step (1) is allowed to stand at room temperature for 1 hour to form a gel, then add absolute ethanol for aging and replacement, and the amount of absolute ethanol can be filled with the alumina sol. The aging and replacement time was 4 days, during which the absolute ethanol impregnated with alumina ...

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Abstract

The invention relates to a block alumina aerogel with high temperature resistance and high specific surface area, which comprises the following components in percentage by weight: 5 to 26.0 percent of yttrium oxide serving as an additive and the balance of alumina. The invention also relates to a method for preparing the block alumina aerogel with high temperature resistance and high specific surface area. In the method, inorganic aluminum salt is used as a precursor, YC13 is used as an additive, mixed solution of absolute ethyl alcohol and water is used as a solvent, and epoxide is used as a gel network inductive agent. The method comprises the following steps of: preparing sol by a sol-gel method; and preparing the transparent block alumina aerogel by supercritical drying. The block alumina aerogel prepared by the method has the characteristics of large specific surface area and good high temperature resistance performance and has an adjustable density in the range of 0.05g/cm3 to 0.1g/cm3. In the invention, sintering and phase variation of the alumina aerogel are inhibited by adding the additive when the alumina aerogel is used at high temperature, and the high specific surface area is kept.

Description

technical field [0001] The invention relates to an alumina airgel, in particular to a block-shaped alumina airgel with high temperature resistance and high specific surface area and a preparation method thereof. Background technique [0002] Airgel is an ultra-light porous condensed matter with a three-dimensional network structure that uses gas as a dispersion medium. The solid phase and pore structure are both on the nanoscale. The pore size and colloid particle size are in the range of 1-100nm and 2-60nm respectively, the porosity can reach 80-99.8%, and the specific surface area can reach 1000m 2 More than / g, the density is as low as 3kg / m 3 , is a typical nanomaterial. Due to its unique nano-network structure, airgel has broad application prospects in thermal insulation, sound insulation, environmental protection, catalysis, adsorption, and high-performance capacitors. At present, the airgel material of silica system is widely studied and applied. However, due to th...

Claims

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Application Information

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IPC IPC(8): C04B35/113C04B38/00C04B111/28
Inventor 胡子君陈晓红周洁洁孙陈诚姚先周李俊宁
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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