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high temperature sio 2 -gd 2 o 3 Composite aerogel and preparation method thereof

A composite airgel, high temperature resistant technology, applied in the preparation/treatment of rare earth metal compounds, chemical instruments and methods, silicon compounds, etc., can solve the problems of not exceeding 650 °C, difficulty in forming rare earth oxide airgel, etc. Achieve uniform distribution, shorten the preparation cycle, high activity and stability

Active Publication Date: 2022-08-02
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 sio <sub>2</sub> -gd <sub>2</sub> o <sub>3</sub> Composite aerogel and preparation method thereof
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  • high temperature sio <sub>2</sub> -gd <sub>2</sub> o <sub>3</sub> Composite aerogel and preparation method thereof

Examples

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 aerogel comprises the following steps:

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

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

[0048] 3) The solution obtained in step 2) was added to the solution obtained in step 1) by spraying, and the temperature in the kettle was kept at 5°C and stirred for 10 min at a speed of 500 r / min, and the pH value of the material in the reaction kettle was controlled to be 1.2 , to obtain clarified SiO 2 Sol solution, let stand for 4h;

[0049] 4) using deionized water to ultrasonicate the hydrated gadolinium nitrate to completely dissolve, the addition of the hydrated gadolinium nitrate is 10.0wt% of the total mass of the precursor salt, and the molar ratio of deionized water and gadolinium n...

Embodiment 2

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

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

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

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

[0063] 4) using deionized water to ultrasonically dissolve the hydrated gadolinium nitrate until completely dissolved, the addition of the hydrated gadolinium nitrate is 5wt% of the total mass of the precursor salt, and the mol ratio of deionized water and gadolinium nitrate is 1:...

Embodiment 3

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

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

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

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

[0077] 4) using deionized water to ultrasonically dissolve gadolinium sulfate hydrate to completely dissolve, the addition of gadolinium sulfate hydrate is 25wt% of the total mass of the precursor salt, and the mol ratio of deionized water and gadolinium sulfate is 1:80;

[00...

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Abstract

The invention discloses high temperature resistant SiO 2 ‑Gd 2 O 3 Composite aerogel and preparation method thereof, by uniformly mixing organosilicon alkoxide, acidic catalyst, deionized water, solvent, soluble gadolinium salt, gel initiator, etc., to obtain colorless and clear SiO 2 ‑Gd 2 O 3 The composite sol solution is then placed at a certain ambient temperature, waiting for gelation and aging, and then the sample is dried by supercritical drying method, and finally heat-treated in an air atmosphere to obtain high temperature resistant SiO 2 ‑Gd 2 O 3 Composite Aerogel. The preparation method is simple to operate, and the prepared aerogel not only retains pure SiO 2 The aerogel has the advantages of low density and low thermal conductivity, and due to the addition of rare earth elements, it has higher temperature resistance. The material prepared by the invention can be used not only in the fields of aerospace, petroleum and petrochemical, ships, etc., but also in the field of nuclear industry, and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nano-composite materials, relates to the preparation of inorganic nano-composite materials with high temperature heat insulation characteristics, and in particular relates to high temperature resistant SiO 2 -Gd 2 O 3 Composite aerogel and preparation method thereof. Background technique [0002] Aerogel is a highly dispersed solid material in which nano-scale colloidal particles aggregate with each other to form a nano-porous network structure, and the voids are filled with gaseous dispersion medium. Aerogel 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 Aerogels are a class of thermal insulation materials that have received extensive attention. They are porous mate...

Claims

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Application Information

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Patent Type & Authority Patents(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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