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SiO2 aerogel/SiC foam composite thermal insulation material and preparation method thereof

A heat-insulating material and aerogel technology, applied in chemical instruments and methods, carbon compounds, silicon compounds, etc., can solve problems such as inability to guarantee long-term reliable use, poor mechanical properties of carbon foam, and easy damage, so as to improve mechanical properties and heat insulation performance, reduce density, reduce the effect of shrinkage

Inactive Publication Date: 2018-12-18
SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, carbon foam has poor mechanical properties, is easy to damage, and is easy to age at high temperatures, which cannot guarantee long-term reliable use. Therefore, based on the above requirements, the technical solution in the present invention is proposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Put melamine foam in a crucible, put it into a quartz tube furnace, and heat it up to 900°C under the protection of nitrogen to pyrolyze it to obtain carbon foam;

[0020] (2) Put the carbon foam prepared in step (1) into the CVI furnace, 3 SiCl 3 is the precursor raw material, H 2 As the carrier gas and dilution gas, the mass flow controller is used to control the gas flow rate to 60mL / min, and the raw material is brought into the reaction chamber by bubbling method. The deposition temperature is 900°C, the pressure is normal pressure, and the time is 12h. SiC foam was obtained at room temperature.

[0021] (3) Mix 15% tetraethyl orthosilicate, 45% ethanol, and 30% deionized water evenly, then add dilute hydrochloric acid with a concentration of 1% to promote hydrolysis, and mechanically stir at 2500rpm for 2 hours to form a sol ;

[0022] (4) Add dilute ammonia water with a concentration of 1% to the sol obtained in step (3), keep the temperature of the kett...

Embodiment 2

[0027] (1) Put melamine foam in a crucible, put it into a quartz tube furnace, and heat it up to 1100°C under the protection of nitrogen to pyrolyze it to obtain carbon foam;

[0028] (2) Put the carbon foam prepared in step (1) into the CVI furnace, 3 SiCl 3 is the precursor raw material, H 2 As the carrier gas and dilution gas, the mass flow controller is used to control the gas flow rate to 120mL / min, and the raw material is brought into the reaction chamber by bubbling method. The deposition temperature is 1200°C, the pressure is normal pressure, and the time is 36h. SiC foam was obtained at room temperature.

[0029] (3) Mix 30% tetraethyl orthosilicate, 40% ethanol, and 30% deionized water evenly, then add dilute hydrochloric acid with a concentration of 5% to promote hydrolysis, and mechanically stir at 3000rpm for 8 hours to form a sol ;

[0030] (4) Add dilute ammonia water with a concentration of 3% to the sol obtained in step (3), keep the temperature of the k...

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Abstract

The invention aims to provide a SiO2 aerogel / SiC foam composite thermal insulation material and a preparation method thereof. The composite thermal insulation material is characterized in that gaps ina SiC foam reinforcement are uniformly filled with the SiO2 aerogel, the density of the composite thermal insulation material is 1-10 Kg / m3, the thermal conductivity of the composite thermal insulation material is 0.018-0.026 W / m.K, the SiC foam skeleton has an open pore structure, the porosity of the SiC foam skeleton is 90-97%, the pore diameter of the SiC foam skeleton is 100-1000 [mu]m, and the specific surface area of of the SiO2 aerogel is 400-600 m<2> / g. SiC foam is prepared by a chemical vapor infiltration technology with carbon foam obtained through pyrolysis of melamine foam as atemplate, and undergoes a sol-gel process and normal-pressure drying to obtain the SiO2 aerogel / SiC foam composite thermal insulation material. The SiO2 aerogel is compounded with the SiC foam, and the SiC foam skeleton has a supporting effect, so the shrinkage of the composite foam is reduced, the density of the composite foam is reduced, the mechanical properties and the thermal insulation property of the composite foam are improved, the composite carbon foam can be used at a high temperature for a long term, and the composite foam has stable and reliable performances, and is not prone to age.

Description

technical field [0001] The invention relates to a composite thermal insulation material and a preparation method thereof, in particular to a composite SiC foam thermal insulation material and a preparation method thereof. Background technique [0002] SiC foam is a new type of green ceramic material, which is composed of many pores arranged in various ways in space. Due to its open three-dimensional network skeleton structure, it has a low volume density (0.25-0.65g / m 3 ), high porosity (70-90%), wide distribution of pore size (from nanometer to millimeter), developed specific surface area and other unique physical characteristics. Combined with these advantages of the ceramic matrix itself, it can endow the material with good temperature adaptability, oxidation resistance, corrosion resistance, low thermal expansion coefficient, good thermal stability, low thermal conductivity, high permeability, good fluid adsorption, and selective permeability. Excellent properties such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/00C01B33/145C01B32/977
CPCC01B32/977C01B33/145C01P2006/12C01P2006/17C04B30/00C04B2201/32C04B2201/50C04B14/064C04B14/324
Inventor 柳炀其他发明人请求不公开姓名
Owner SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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