Preparation method of high temperature-resistant boron carbide-silicon carbide compound aerogel

A technology of composite airgel and boron carbide, which is applied in the field of composite material preparation technology, can solve the problems of large volume of concrete materials, inability to use emergency and rapid use, poor neutron absorption effect, etc., and achieve low density, low thermal conductivity, high neutron Effect of Absorbing Sections

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

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Problems solved by technology

Traditional radiation protection materials are widely used, but if concrete materials are used as radiation protection materials, although they have high temperature resistance and radiation protection properties, the concrete materials are bulky and cannot be used in an emergency; although lead is a good radiation protection material, it has It has defects such as low temperature resistance, toxicity, and poor neutron absorption effect.

Method used

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  • Preparation method of high temperature-resistant boron carbide-silicon carbide compound aerogel
  • Preparation method of high temperature-resistant boron carbide-silicon carbide compound aerogel

Examples

Experimental program
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Embodiment 1

[0025] 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. 0.1 mol of boric acid and 5 mol of absolute ethanol were ultrasonically mixed to obtain solution B. Add solution B and 1mol 3-aminopropyltriethylsilane to solution A and mix evenly to obtain a 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 8 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 12MPa, the temperature is controlled at 50°C, and the drying time is 8 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 atmosphere, and the holding time was 5 hours, ...

Embodiment 2

[0027] 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. 1.5 mol of boric acid and 8 mol of absolute ethanol were ultrasonically mixed to obtain solution B. Add solution B and 0.5mol 3-aminopropyltriethylsilane to solution A and mix evenly to obtain a pale yellow composite sol solution. Pour it into the mold, let it stand for 30 minutes, add absolute ethanol for solvent replacement, replace it every 12 hours, and replace it 3 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 8MPa, the temperature is controlled at 60°C, and the drying 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 helium atmosphere, and the holding time was 6 hours, the...

Embodiment 3

[0029] 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. 2 mol of boric acid and 10 mol of absolute ethanol were ultrasonically mixed to obtain solution B. Add solution B and 1.5mol 3-aminopropyltriethylsilane into solution A, mix well and stir to obtain a pale yellow composite sol solution. Pour it into the mold, let it stand for 40 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 drying 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 argon atmosphere, and the holding time was 7...

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Abstract

The invention relates to a preparation method of a high temperature-resistant boron carbide-silicon carbide compound aerogel. The method comprises taking absolute ethyl alcohol and deionized water assolvent, mixing a preferable boron source with m-dihydroxybenzene, formaldehyde and 3-aminopropyl triethyl silane at a certain molar ratio to obtain a solution, namely, light yellow compound gel; performing aging and solvent replacement on the wet gel and then drying the wet gel through the supercritical drying technology to obtain a boron carbide-silicon carbide precursor, and under protection ofinert gas and through carbon thermal reduction, obtaining the high temperature-resistant boron carbide-silicon carbide compound aerogel. The preparation method of the high temperature-resistant boroncarbide-silicon carbide compound aerogel is simple and reliable in preparation process and rich and simple in raw materials; the prepared high temperature-resistant boron carbide-silicon carbide compound aerogel can be widely applied to the fields such as chemical equipment and high-temperature kiln.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation technology, and in particular relates to a preparation method of high temperature resistant boron carbide-silicon carbide composite airgel. Background technique [0002] Nuclear energy is the most promising alternative energy source. Nuclear power is a resource-rich, energy-efficient, reliable, and clean energy source that has attracted the attention, attention, and active promotion of all countries. Nuclear safety is the premise, basis and lifeline for the sustainable development of nuclear energy. Traditional radiation protection materials are widely used, but if concrete materials are used as radiation protection materials, although they have high temperature resistance and radiation protection properties, the concrete materials are bulky and cannot be used in an emergency; although lead is a good radiation protection material, it has It has defects such as low temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/563C04B35/624C04B41/91
CPCC04B35/563C04B35/571C04B35/573C04B35/624C04B41/009C04B41/5353C04B41/91C04B2235/658C04B2235/77C04B2235/96
Inventor 崔升锁浩余数温沈晓冬郁可葳
Owner NANJING TECH UNIV
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