High-temperature-resistant SiO2-Gd2O3 composite aerogel and preparation method thereof

A composite aerogel, high temperature resistant technology, applied in the preparation/processing of rare earth metal compounds, chemical instruments and methods, silicon compounds, etc., can solve the problems of not exceeding 650 ℃, difficulty in forming rare earth oxide aerogels, etc. Achieve uniform distribution, shorten the preparation cycle, and overcome molding difficulties.

Active Publication Date: 2021-02-05
CHANGSHA RONGLAN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is aimed at existing SiO 2 The maximum service temperature of airgel does not exceed 800°C, and the long-term stable service temperature does not exceed 650°C. Provide high temperature resistant SiO 2 -Gd 2 o 3 Composite airgel and its preparation method, using silicon-based airgel as a structural carrier, compounding with rare earth to prepare SiO with good formability 2 -Gd 2 o 3 Composite airgel, which not only solves the problem of difficult formation of rare earth oxide airgel, but also suppresses SiO by rare earth 2 high temperature sintering, which improves the SiO 2 The temperature resistance performance of SiO 2 -Gd 2 o 3 Composite airgel will show greater potential in fields such as heat insulation, catalysis, and nuclear industry

Method used

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  • High-temperature-resistant SiO2-Gd2O3 composite aerogel and preparation method thereof
  • High-temperature-resistant SiO2-Gd2O3 composite aerogel and preparation method thereof
  • High-temperature-resistant SiO2-Gd2O3 composite aerogel and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0045] High temperature resistant SiO 2 -Gd 2 o 3 The preparation method of composite airgel comprises the following steps:

[0046] 1) Add ethyl orthosilicate and ethanol into the reaction kettle at a molar ratio of 1:2.5, stir at 5°C, and stir at a stirring rate of 350r / min for 15min;

[0047] 2) Mix concentrated nitric acid and ethanol evenly in a ratio of 1:1500;

[0048] 3) Add the solution obtained in step 2) to the solution obtained in step 1) by spraying, keep the temperature in the kettle at 5°C and stir for 10min at a speed of 500r / min, and control the pH value of the material in the reactor to 1.2 , to obtain clarified SiO 2 Sol solution, let stand for 4h;

[0049] 4) Using deionized water to sonicate hydrated gadolinium nitrate until it is completely dissolved, the added amount of hydrated gadolinium nitrate is 10.0wt% of the total mass of the precursor salt, and the molar ratio of deionized water to gadolinium nitrate is 1:100;

[0050] 5) Add the solution o...

Embodiment 2

[0059] High temperature resistant SiO 2 -Gd 2 o 3 The preparation method of composite airgel comprises the following steps:

[0060] 1) Add ethyl orthosilicate and ethanol into the reaction kettle at a molar ratio of 1:6, stir at 10°C, and stir at a rate of 300r / min for 20min;

[0061] 2) Mix glacial acetic acid and ethanol evenly in a ratio of 1:500;

[0062] 3) Add the solution obtained in step 2) to the solution obtained in step 1) by spraying, keep the temperature in the kettle at 10°C and stir for 30min at a speed of 1000r / min, and control the pH value of the material in the reactor to 2.5 , to obtain clarified SiO 2 Sol solution, let stand for 6h;

[0063] 4) Using deionized water to sonicate hydrated gadolinium nitrate until it is completely dissolved, the added amount of hydrated gadolinium nitrate is 5wt% of the total mass of the precursor salt, and the molar ratio of deionized water to gadolinium nitrate is 1:40;

[0064] 5) Add the solution obtained in step 4)...

Embodiment 3

[0073] High temperature resistant SiO 2 -Gd 2 o 3 The preparation method of composite airgel comprises the following steps:

[0074] 1) Add tetraethyl orthosilicate and acetone in a molar ratio of 1:1 into the reaction kettle, stir at 2°C, and stir at a stirring rate of 200r / min for 10min;

[0075] 2) Mix concentrated hydrochloric acid and ethanol evenly in a ratio of 1:3000;

[0076] 3) Add the solution obtained in step 2) to the solution obtained in step 1) by spraying, keep the temperature in the kettle at 2°C and stir for 20min at a speed of 800r / min, and control the pH value of the material in the reactor to 2.0 , to obtain clarified SiO 2 Sol solution, let stand for 4h;

[0077] 4) Using deionized water to sonicate the hydrated gadolinium sulfate until it is completely dissolved, the added amount of the hydrated gadolinium sulfate is 25wt% of the total mass of the precursor salt, and the molar ratio of deionized water to gadolinium sulfate is 1:80;

[0078] 5) Add ...

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Abstract

The invention discloses high-temperature-resistant SiO2-Gd2O3 composite aerogel and a preparation method thereof. The preparation method comprises the following steps of: uniformly mixing organosilicone alkoxide, an acidic catalyst, deionized water, a solvent, soluble gadolinium salt, a gel initiator and the like to obtain a colorless clear SiO2-Gd2O3 composite sol solution, standing at a certainenvironment temperature, waiting for gelation and aging, then drying a sample by adopting a supercritical drying method, and finally carrying out heat treatment in an air atmosphere to obtain the high-temperature-resistant SiO2-Gd2O3 composite aerogel. The preparation method is simple to operate, and the prepared aerogel not only retains the advantages of low density and low thermal conductivity of pure SiO2 aerogel, but also has higher temperature resistance due to the addition of rare earth elements. The prepared material can be used in the fields of aerospace, petroleum and petrochemical engineering, ships and the like, can also be used in the field of nuclear industry, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nanocomposite materials, and relates to the preparation of inorganic nanocomposite materials with high temperature and heat insulation characteristics, in particular to high temperature resistant SiO 2 -Gd 2 o 3 Composite airgel and its preparation method. Background technique [0002] Airgel is a highly dispersed solid material in which nanoscale colloidal particles aggregate to form a nanoporous network structure, and the gaps are filled with gaseous dispersion media. Airgel materials have special properties such as high porosity, high surface activity, high specific surface energy and specific surface area, and have broad application prospects in the fields of optics, electricity, catalysis, and thermal insulation. [0003] SiO 2 Airgel is a kind of heat insulation material that has received extensive attention. It is a porous material prepared by a special drying process f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/224C01F17/10C01B33/158
CPCC01F17/224C01F17/10C01B33/1585C01P2004/82C01P2002/85C01P2006/12C01P2004/01
Inventor 阳立芬杨斌高庆福杨佳李勇熊熙宋牧伍善文
Owner CHANGSHA RONGLAN MACHINERY
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