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A kind of large-size silicon carbide airgel and its preparation method

A silicon carbide and aerogel technology, applied in the field of silicon carbide aerogel preparation, can solve the problems of high cost, complicated preparation process, and expensive price, and achieve the effects of low equipment requirements, high preparation efficiency, and non-toxic solvents

Active Publication Date: 2021-09-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The ceramic aerogels of the existing systems generally have the following disadvantages: 1) brittleness; 2) the preparation process is complicated and the cost is high; 3) it is difficult to make a size suitable for practical application, and usually the airgel powder is prepared
In the previous research process, the applicant's research group has developed a silicon carbide airgel (see document ACS Nano, 12, 3103-3111), which is composed of a large number of 20-50nm silicon carbide, this material overcomes the The brittleness of traditional airgel materials is overcome, but it still faces the defects of complex preparation process, low output and high price, which limits its large-scale industrial application

Method used

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  • A kind of large-size silicon carbide airgel and its preparation method
  • A kind of large-size silicon carbide airgel and its preparation method
  • A kind of large-size silicon carbide airgel and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0043] This embodiment has prepared the density is 2mg / cm 3 Silicon carbide airgel, the specific steps are as follows:

[0044] 1) Using dimethyldimethoxysilane (mass fraction 10wt.%) as a sol raw material, water as a crosslinking agent (mass fraction 10wt.%) and absolute ethanol as a solvent (mass fraction 80wt.%) to prepare silicon Oxygen sol;

[0045] 2) Disperse 2g of chopped carbon fibers (length about 1mm, mass fraction 1wt.%) in 100ml of silica sol, and perform mechanical stirring for 10min, so that the chopped carbon fibers are uniformly dispersed in the siloxane sol;

[0046] 3) The method of vacuum filtration is adopted to make the carbon fibers dispersed in the sol overlap each other into a three-dimensional structure block;

[0047] 4) Heating to the curing temperature (100°C) in the air, and heat preservation for 4 hours;

[0048] 5) The temperature is raised to 1200°C in argon with a pressure of 0.1Mpa, and the temperature is kept for 2 hours, and the gel is c...

Embodiment 2

[0051] This embodiment prepared 4mg / cm 3 Silicon carbide airgel, the specific steps are as follows:

[0052] 1) Using methyltrimethoxysilane (mass fraction 10wt.%) sol as raw material, water as crosslinking agent (mass fraction 70wt.%) and absolute ethanol as solvent (mass fraction 20wt.%) to prepare siloxane sol ;

[0053] 2) Disperse 2g of chopped carbon fibers (length about 1mm, mass fraction 2wt.%) in 100ml of silica sol, and perform ultrasonication for 15min, so that the chopped carbon fibers are uniformly dispersed in the siloxane sol;

[0054] 3) Using the method of vacuum filtration, the chopped carbon fibers dispersed in the sol are overlapped to form a three-dimensional block;

[0055] 4) Heating to the curing temperature (100°C) in the air, and heat preservation for 4 hours;

[0056] 5) The temperature is raised to 1500° C. in argon with a pressure of 0.1 MPa, and the temperature is kept for 2 hours, and the gel is cracked to form silicon carbide nanowires;

[0...

Embodiment 3

[0059] This embodiment prepared 15mg / cm 3 Silicon carbide airgel, the specific steps are as follows:

[0060] 1) Using methyltrimethoxysilane (mass fraction 40wt.%) sol as raw material, water as crosslinking agent (mass fraction 50wt.%) and absolute ethanol as solvent (mass fraction 10wt.%) to prepare siloxane sol ;

[0061] 2) Disperse 2g of chopped carbon fibers (length about 1mm, mass fraction 2wt.%) in 100ml of silica sol, and perform ultrasonication for 15min, so that the chopped carbon fibers are uniformly dispersed in the siloxane sol;

[0062] 3) Using the method of vacuum filtration, the chopped carbon fibers dispersed in the sol are overlapped to form a three-dimensional block;

[0063] 4) Apply a pressure of 10kPa to the block;

[0064] 5) Heating to the curing temperature (100°C) in the air, and heat preservation treatment for 4 hours;

[0065] 6) In argon with a pressure of 0.25 MPa, the temperature is raised to 1550 ° C, and the temperature is kept for 2 hour...

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Abstract

The invention discloses a large-size silicon carbide airgel and a preparation method thereof, belonging to the technical field of silicon carbide airgel preparation. With a three-dimensional porous network microstructure constructed from nanometer (diameter 20-100nm) to submicron (diameter 0.1-0.5μm) silicon carbide nanowires, the aerogel is a silicon carbide gas with a practical size Gel, easy to realize industrial scale production. The prepared silicon carbide airgel has ultra-high porosity (>90%), and is suitable for heat insulation, catalyst carrier, filtration, energy storage and other materials. The method for preparing the above-mentioned large-size silicon carbide airgel disclosed by the present invention has a simple process, does not need the high cost and time-consuming drying equipment and process involved in the traditional airgel preparation technology, has low requirements for equipment, and has high production efficiency. , silicon carbide airgel with practical size can be prepared, and it is easy to realize industrial scale production.

Description

technical field [0001] The invention belongs to the technical field of silicon carbide airgel preparation, and in particular relates to a large-size silicon carbide airgel and a preparation method thereof. Background technique [0002] Airgel is a kind of solid with ultra-low density, ultra-high porosity (>90%) and ultra-high specific surface area. Energy saving, catalytic filtration, sensing and other aspects have huge potential application value. In the field of thermal insulation, aerogel is regarded as the material with the best thermal insulation performance so far because of its ultra-low thermal conductivity. At present, the most mature preparation technology is silica aerogel, and the aerogel referred to in the market defaults to silica aerogel. The long-term service temperature of silica airgel can reach 650°C. Compared with traditional heat insulation materials such as polyurethane foam, polystyrene foam and other organic materials, the service temperature doe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B38/06C04B38/00
CPCC04B35/571C04B35/573C04B38/068C04B2235/5248C04B2235/6562C04B2235/77C04B38/0045C04B38/0074C04B38/0067
Inventor 王红洁卢德苏磊牛敏蔡志新
Owner XI AN JIAOTONG UNIV
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