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Preparation method of fiber composite boron carbide-aluminum oxide aerogel material

A technology of alumina airgel and composite boron carbide, which is applied in the direction of airgel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problem that the heat insulation performance cannot meet the technical indicators, restrict the healthy development of the photovoltaic industry, and high-purity graphite Insufficient felt technology and other issues, to achieve the effect of high neutron absorption cross section, low thermal conductivity, low price and easy availability

Inactive Publication Date: 2020-01-21
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The thermal insulation materials in existing single / polycrystalline furnaces at home and abroad mainly use high-purity graphite felt materials, which are expensive and have high high-temperature thermal conductivity (0.44W·m at 1500°C -1 ·K -1 ) and short replacement cycle, and the domestic production of high-purity graphite felt is insufficient in technology, and the heat insulation performance is difficult to meet the technical indicators of single / polycrystalline silicon growth furnace crystal furnace
Due to its ultra-low thermal conductivity, airgel materials have become the most ideal thermal insulation materials at present, but the maximum service temperature of existing commercial airgel products at home and abroad is less than 1000°C, which is difficult to apply to ultra-high temperature equipment
Therefore, in the thermal insulation market of ultra-high temperature furnaces such as mono / polysilicon growth furnaces, foreign companies have almost monopolized the market with the help of high-purity graphite felt materials, seriously restricting the healthy development of my country's photovoltaic industry

Method used

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  • Preparation method of fiber composite boron carbide-aluminum oxide aerogel material

Examples

Experimental program
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Effect test

example 1

[0025] 1 mol of boric acid, 30 mol of deionized water and 10 mol of absolute ethanol were ultrasonically dispersed, and heated and stirred at 50°C to obtain solution A. 1 mol of resorcinol, 2 mol of formaldehyde and 8.5 mol of absolute ethanol were mixed and stirred uniformly to obtain solution B. Mix 1 mol of aluminum chloride hexahydrate, 20 mol of absolute ethanol and 10 mol of deionized water and stir evenly. Mix solution A and solution C and add to solution B for mixing, and add 0.5 mol of anhydrous citric acid and stir evenly to obtain a light yellow sol solution. Pour it into the mold that has been cut into the carbon fiber felt, let it stand for 30 minutes, put it in an oven at 40°C for 5 hours of aging treatment, add absolute ethanol for solvent replacement, and replace it every 8 hours, a total of 3 replacements. The replaced wet gel was subjected to CO 2 Supercritical drying treatment, in which the pressure of the kettle body is controlled at 8 MPa, the temperatur...

example 2

[0027] 1 mol of boric acid, 70 mol of deionized water and 30 mol of absolute ethanol were ultrasonically dispersed, heated and stirred at 80°C to obtain solution A. 1 mol of resorcinol, 2 mol of formaldehyde and 32 mol of absolute ethanol were mixed and stirred uniformly to obtain solution B. Mix 1mol aluminum chloride hexahydrate, 40mol absolute ethanol and 50mol deionized water and stir evenly. Mix solution A and solution C and add to solution B for mixing, and add 2 mol of anhydrous citric acid and stir evenly to obtain a light yellow sol solution. Pour it into a mold that has been cut into carbon fiber felt, let it stand for 60 minutes, put it in an oven at 70°C for 5 hours of aging treatment, add absolute ethanol for solvent replacement, and replace it every 24 hours, a total of 6 replacements. The replaced wet gel was subjected to CO 2 Supercritical drying treatment, in which the pressure of the kettle body is controlled at 12.5MPa, the temperature is controlled at 55°...

example 3

[0029] 1 mol of boric acid, 50 mol of deionized water and 20 mol of absolute ethanol were ultrasonically dispersed, and heated and stirred at 65°C to obtain solution A. 1 mol of resorcinol, 2 mol of formaldehyde and 20 mol of absolute ethanol were mixed and stirred uniformly to obtain solution B. Mix 2mol aluminum chloride hexahydrate, 60mol absolute ethanol and 60mol deionized water and stir evenly. Mix solution A and solution C and add to solution B for mixing, and add 1 mol of anhydrous citric acid and stir evenly to obtain a light yellow sol solution. Pour it into a mold that has been cut into carbon fiber felt, let it stand for 45 minutes, put it in an oven at 60°C for 5 hours of aging treatment, add absolute ethanol for solvent replacement, and replace it every 16 hours, a total of 5 replacements. The replaced wet gel was subjected to CO 2 Supercritical drying treatment, in which the pressure of the kettle body is controlled at 10MPa, the temperature is controlled at 5...

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Abstract

The invention relates to a preparation method of a fiber composite boron carbide-aluminum oxide aerogel material, which comprises the following steps: uniformly mixing a boron source, resorcinol, formaldehyde, aluminum chloride hexahydrate, absolute ethyl alcohol and deionized water according to a molar ratio to obtain a faint yellow composite sol solution; impregnating cut fiber felt; standing toobtain fiber composite wet gel; subjecting the fiber composite wet gel to solvent replacement and drying treatment to obtain a fiber composite boron carbide-aluminum oxide aerogel precursor; and preparing the fiber composite boron carbide-aluminum oxide aerogel through a carbon thermal reduction technology under inert atmosphere protection. The preparation process is simple, the price of raw materials is low, the problem that a heat preservation and insulation material in an existing single / polycrystal furnace depends on import can be solved, and the method can be applied to the fields of refractory materials, engineering ceramics, nuclear industry, aerospace and the like.

Description

technical field [0001] The invention belongs to a composite material preparation process, in particular to a preparation method of a fiber composite boron carbide-alumina airgel material. Background technique [0002] The thermal insulation materials in existing single / polycrystalline furnaces at home and abroad mainly use high-purity graphite felt materials, which are expensive and have high high-temperature thermal conductivity (0.44W·m at 1500°C -1 ·K -1 ) and short replacement cycle, and the domestic production of high-purity graphite felt technology is insufficient, and the heat insulation performance is difficult to meet the technical indicators of single / polycrystalline silicon growth furnace crystal furnace. Due to its ultra-low thermal conductivity, airgel materials have become the most ideal thermal insulation materials at present, but the maximum service temperature of existing commercial airgel products at home and abroad is less than 1000 °C, which is difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 崔升王伟黄舜天戴涛赵一帆沈晓冬
Owner NANJING UNIV OF TECH
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