Block boron carbide-silicon carbide composite aerogel preparation method

A composite airgel and boron carbide technology, which is applied in ceramic products, applications, household appliances, etc., can solve the problems of performance degradation, large volume and limited use, etc., and achieve the effect of excellent product performance, wide application range and wide application range

Active Publication Date: 2018-06-12
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although radiation-resistant concrete has high temperature resistance and good structural performance, its large volume limits its use in emergency transportation
Although fibrous polymer shielding materials have the advantages of light weight, small size and easy handling, their performance at high temperatures will be greatly reduced

Method used

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  • Block boron carbide-silicon carbide composite aerogel preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Mix and stir 1 mol of resorcinol, 2 mol of formaldehyde, 15 mol of deionized water and 18 mol of absolute ethanol to obtain solution A. 0.5 mol of nano boron carbide powder with a particle size of 30 nm, 1 mol of 3-aminopropyltriethylsilane and 5 mol of absolute ethanol were ultrasonically mixed to obtain solution B. Add solution B into solution A and mix evenly to obtain light yellow composite sol solution. Pour it into the mold, let it stand for 70 minutes, add absolute ethanol for solvent replacement, and replace it every 8 hours, a total of 4 replacements. The replaced composite wet gel was subjected to CO 2 Supercritical drying treatment, in which the pressure of the kettle body is controlled at 10 MPa, the temperature is controlled at 45° C., and the reaction time is 10 hours to obtain a boron carbide-silicon carbide precursor. The obtained boron carbide-silicon carbide precursor was heated to 1500°C at a heating rate of 3°C / min under the protection of an argon ...

Embodiment 2

[0026] Mix and stir 1 mol of resorcinol, 2 mol of formaldehyde, 5 mol of deionized water and 26 mol of absolute ethanol to obtain solution A. 0.1 mol of nano boron carbide powder with a particle size of 20 nm, 1.5 mol of 3-aminopropyltriethylsilane and 8 mol of absolute ethanol were ultrasonically mixed to obtain solution B. Add solution B into solution A and mix evenly to obtain light yellow composite sol solution. Pour it into the mold, and after standing for 60 minutes, add absolute ethanol for solvent replacement, and replace it every 12 hours, a total of 3 replacements. The replaced composite wet gel was subjected to CO 2 Supercritical drying treatment, in which the pressure of the kettle body is controlled at 9 MPa, the temperature is controlled at 48° C., and the reaction time is 13 hours to obtain a boron carbide-silicon carbide precursor. The obtained boron carbide-silicon carbide precursor was heated to 1550°C at a heating rate of 2°C / min under the protection of a ...

Embodiment 3

[0028] Mix and stir 1 mol of resorcinol, 2 mol of formaldehyde, 10 mol of deionized water and 20 mol of absolute ethanol to obtain solution A. 0.3 mol of nano boron carbide powder with a particle size of 40 nm, 0.5 mol of 3-aminopropyltriethylsilane and 10 mol of absolute ethanol were ultrasonically mixed to obtain solution B. Add solution B into solution A and mix evenly to obtain light yellow composite sol solution. Pour it into the mold, let it stand for 50 minutes, add absolute ethanol for solvent replacement, and replace it every 15 hours, and replace it 4 times in total. The replaced composite wet gel was subjected to CO 2 Supercritical drying treatment, in which the pressure of the kettle body is controlled at 11MPa, the temperature is controlled at 50°C, and the reaction time is 12 hours to obtain a boron carbide-silicon carbide precursor. The obtained boron carbide-silicon carbide precursor was heated to 1450°C at a heating rate of 4°C / min under the protection of an...

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Abstract

The invention relates to a block boron carbide-silicon carbide composite aerogel preparation method. The method includes: stirring nano boron carbide powder, resorcinol, formaldehyde, 3-aminopropyl triethyl silicane, absolute ethyl alcohol and deionized water according to a mole ratio to obtain faint yellow composite sol solution, and standing to obtain wet gel; subjecting the wet gel to solvent replacement, drying the wet gel according to a CO2 supercritical drying technique to obtain a boron carbide-silicon carbide precursor, and adopting a carbon thermal reduction technique in an inert atmosphere to obtain block boron carbide-silicon carbide composite aerogel. The block boron carbide-silicon carbide composite aerogel prepared according to the method has advantages of high specific surface, low density, high porosity, high temperature resistance and the like, a technical process is simple and easy in operation, and preparation of the block boron carbide-silicon carbide composite aerogel hopefully has a promising application prospect in fields of chemical equipment, high-temperature kilns and the like.

Description

technical field [0001] The invention belongs to a composite material preparation process, in particular to a preparation method of block boron carbide-silicon carbide composite airgel. In particular, the sol-gel method combined with CO 2 A method for preparing bulk boron carbide-silicon carbide composite airgel by supercritical drying and carbothermal reduction technology. Background technique [0002] With the progress of science and technology, my country's nuclear industry is developing vigorously. It is estimated that by 2020, the annual amount of spent fuel unloaded from nuclear reactors will reach more than 1,000 tons. If an accident occurs during storage and transportation, extremely strong nuclear radiation will be generated, which requires corresponding rapid nuclear accident emergency protection equipment to prevent and emergency rescue. At present, nuclear radiation shielding materials are concentrated as radiation-proof concrete and fiber polymer composite mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/571C04B35/624C04B38/06G21F1/02
CPCC04B35/563C04B35/571C04B35/624C04B38/0605C04B2235/3821C04B2235/3826C04B2235/5454C04B2235/6023C04B2235/606C04B2235/656C04B2235/6562C04B2235/6567C04B2235/658C04B2235/6583C04B2235/77C04B2235/96C04B2235/9607G21F1/026C04B38/0045
Inventor 崔升锁浩余数温沈晓冬黄舜天
Owner NANJING UNIV OF TECH
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