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Preparation method of high-temperature resistant silicon carbide aerogel heat-insulation composite material

A composite material and aerogel technology, which is applied in the field of preparation of high-temperature-resistant silicon carbide airgel thermal insulation composite materials, can solve unsatisfactory problems, and achieve the effects of low cost, easy-to-obtain raw materials, and simple equipment

Active Publication Date: 2013-02-06
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

al 2 o 3 Airgel has higher temperature resistance and can be used normally at 1000°C. However, with the development of technology, the temperature requirements for materials are getting higher and higher. In many cases, materials need to reach 1200°C in the atmosphere. °C or even higher temperature resistance, traditional oxide aerogels and carbon aerogels cannot meet the needs of applications, and it is necessary to develop an aerogel insulation material that can withstand higher temperatures

Method used

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  • Preparation method of high-temperature resistant silicon carbide aerogel heat-insulation composite material

Examples

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example 1

[0016] Mix resorcinol, formaldehyde, 3-aminopropyltriethoxysilane, water, and ethanol in a molar ratio of 1:2:1.5:3:17 to form a carbon-silicon mixed sol; pour the mixed sol into the In the mold with pretreated aluminum silicate fiber cotton, keep the sol liquid level just submerged fiber cotton, after sealing, carry out sol-gel reaction at 25°C for 4 hours to obtain fiber-reinforced carbon-silicon composite gel; After taking out the carbon-silicon composite gel, dry it in a 50°C oven under normal pressure for 12 hours to obtain a fiber-reinforced carbon-silicon composite aerogel; place the fiber-reinforced carbon-silicon composite aerogel in a tube furnace, Next, heat up to 1500°C with a heating rate of 1°C / min, keep it warm for 5 hours, and obtain a silicon carbide product containing residual carbon after being cooled to room temperature; Calcined in the atmosphere for 2 hours to obtain a fiber-reinforced high-temperature-resistant silicon carbide airgel heat-insulating comp...

example 2

[0018] Mix resorcinol, formaldehyde, 3-aminopropyltriethoxysilane, tetraethyl orthosilicate, water, and ethanol in a molar ratio of 1:2:1.8:0.2:4:34 to make carbon-silicon Mixed sol: Pour the mixed sol into a mold equipped with pretreated aluminum silicate fiber cotton, keep the sol liquid level just submerged in the fiber cotton, and perform sol-gel reaction at 40°C for 8 hours after sealing to obtain fiber reinforcement Carbon-silicon composite gel; take out the fiber-reinforced carbon-silicon composite gel and dry it in a 60°C oven under normal pressure for 12 hours to obtain fiber-reinforced carbon-silicon composite aerogel; place the fiber-reinforced carbon-silicon composite aerogel In a tube furnace, under the protection of argon, the temperature was raised to 1550°C at a heating rate of 1°C / min, kept for 4 hours, and a silicon carbide product containing residual carbon was obtained after cooling to room temperature; the fiber containing residual carbon was The reinforce...

example 3

[0021] Mix resorcinol, formaldehyde, 3-aminopropyltriethoxysilane, tetraethylorthosilicate, water, and ethanol in a molar ratio of 1:2:1:1:4:69 to make carbon-silicon Mixed sol; pour the mixed sol into a mold with pretreated aluminum silicate fiber cotton, keep the sol liquid level just submerged in the fiber cotton, and perform sol-gel reaction at 60°C for 12 hours after sealing to obtain fiber reinforcement Carbon-silicon composite gel; take out the fiber-reinforced carbon-silicon composite gel and dry it in a 70°C oven under normal pressure for 48 hours to obtain fiber-reinforced carbon-silicon composite aerogel; place the fiber-reinforced carbon-silicon composite aerogel In a tube furnace, under the protection of argon, the temperature was raised to 1600°C at a heating rate of 2°C / min, kept for 3 hours, and a silicon carbide product containing residual carbon was obtained after cooling to room temperature; the fiber containing residual carbon was The reinforced airgel samp...

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Abstract

The invention belongs to the field of preparation of nano porous materials, and relates to a preparation method of a high-temperature resistant silicon carbide aerogel heat-insulation composite material. The high-temperature resistant silicon carbide aerogel heat-insulation composite material is a heat-insulation material composed of aluminum silicate fiber felts and silicon carbide aerogel and capable of resisting high temperature of 1200 DEG C at the air atmosphere. The preparation method includes steps of uniformly mixing benzenediol, formaldehyde, a silicon source, water and ethanol to obtain a mixture, treating the mixture by a gel-sol method, ageing and drying the mixture to obtain fiber reinforced carbon-silicon composite aerosol, subjecting the fiber reinforced carbon-silicon composite aerosol to carbon thermal reduction under argon gas protection, calcining in air so as to obtain the fiber reinforced high-temperature resistant silicon carbide aerogel heat-insulation composite material. The preparation method requires simple materials and is easy and convenient to operate, and the composite material is easy to produce in scale.

Description

technical field [0001] The invention belongs to the field of preparation technology of nanoporous materials, and in particular relates to a preparation method of a high-temperature-resistant silicon carbide airgel heat-insulating composite material. Background technique [0002] Airgel is a kind of nanoporous material composed of nanoparticles aggregated with each other. It has many special properties, such as high specific surface area, low density and high porosity, so it has broad application prospects in the fields of heat insulation, adsorption and catalysis. There are dozens of reported aerogels, which can be divided into three categories: oxide aerogels, organic (carbon) aerogels, and carbide aerogels according to their components. In terms of thermal insulation applications, the most researched is SiO 2 Aerogel, Al 2 o 3 Aerogels and carbon aerogels. SiO 2 The normal service temperature of airgel and its composite materials is up to 800°C. Above 800°C, the pore ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/624
Inventor 沈晓冬孔勇崔升仲亚
Owner NANJING UNIV OF TECH
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