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Preparation method of fiber-reinforced Al2O3-SiO2 aerogel material with wave transmission and heat insulation integrated function

A fiber-reinforced, aerogel technology, applied in the field of aerogel material preparation, can solve problems such as low thermal conductivity, and achieve the effects of low thermal conductivity, high wave transmittance and simple process

Active Publication Date: 2017-05-10
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a hypersonic vehicle flies at a speed of Mach 4-5, the temperature of the outer surface of the cabin can reach 400-600°C. With the advent of aircraft and aerospace aircraft, the flight speed of these aircraft will be as high as Mach 8 or more, and the reentry process will last for about 10 minutes, resulting in a wide field of view suitable for installing radome, such as the nose of the aircraft and the leading edge of the wing. The temperature can be as high as 1200°C. These parts are bound to encounter severe aerodynamic heating problems. In order to prevent external heat from entering the body through the wave-transparent window or cover without affecting the normal communication requirements of the aircraft, it is urgent to prepare a new type of high-temperature resistant , lightweight, low thermal conductivity, high wave-transmitting high-efficiency heat insulation material

Method used

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  • Preparation method of fiber-reinforced Al2O3-SiO2 aerogel material with wave transmission and heat insulation integrated function
  • Preparation method of fiber-reinforced Al2O3-SiO2 aerogel material with wave transmission and heat insulation integrated function
  • Preparation method of fiber-reinforced Al2O3-SiO2 aerogel material with wave transmission and heat insulation integrated function

Examples

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Effect test

example 1

[0028] After uniformly mixing aluminum chloride hexahydrate, ethanol, water, and tetraethylorthosilicate at a molar ratio of 1:5:60:0.128, uniformly stir at a temperature of 50° C. and a stirring rate of 500 rpm for 2 hours. Then add 50% of silicon nitride powder with excellent wave-transmitting properties into the above sol system, and continue to stir uniformly for 2 hours at a temperature of 50° C. and a stirring rate of 500 rpm to obtain a homogeneous mixture with silicon nitride powder. Add propylene oxide at a molar ratio of 8:1 to aluminum chloride hexahydrate, stir at 500rpm for 0.5h, then pour the mixture into a mold with high-purity quartz fibers to react until it gels, and leave it for 30h Add ethanol aging solution, and replace in an oven at 50°C for 3 times, each time for 12h. Then the wet gel was subjected to ethanol supercritical drying treatment, the reaction temperature was 250°C, the pressure in the autoclave was 10MPa, and the drying time was 2h, to obtain f...

example 2

[0030] After uniformly mixing aluminum nitrate nonahydrate, ethanol, water, and methyl orthosilicate in a molar ratio of 1:10:30:0.5, uniformly stir at a temperature of 25° C. for 0.5 h. Then add 30% boron carbide powder with excellent wave-transmitting properties into the above sol system, and continue to uniformly stir for 0.5 h at a temperature of 25° C. to obtain a uniform mixture with boron carbide powder. Add cis-2,3 butylene oxide at a molar ratio of 5:1 to aluminum nitrate nonahydrate, stir for 1 hour, and pour the mixture into a mold with polycrystalline mullite fibers to react until gelling, and place After 20 hours, ethanol aging solution was added, and replaced in an oven at 45°C for 5 times, 18 hours each time. Then the wet gel is subjected to ethanol supercritical drying treatment, the reaction temperature is 270 ° C, the pressure in the autoclave is 14 MPa, and the drying time is 4 h, and the fiber-reinforced AlOOH-SiO is obtained. 2 airgel material. Finally, ...

example 3

[0032] After uniformly mixing aluminum nitrate nonahydrate, ethanol, water, and methyltriethoxysilane at a molar ratio of 1:25:40:0.75, uniformly stir at a temperature of 40° C. at a stirring rate of 550 rpm for 1 h. Then add 80% boron nitride powder with excellent wave-transmitting properties into the above sol system, and continue to uniformly stir for 1 hour at a temperature of 40° C. and a stirring rate of 550 rpm to obtain a uniform mixture with boron nitride powder. Add oxetane at a molar ratio of 6:1 to aluminum nitrate nonahydrate, stir at a stirring rate of 400rpm for 2h, then pour the mixture into a mold with aluminum silicate fibers to react until it gels, and let it stand for 15h After that, ethanol aging solution was added, and the replacement was carried out in an oven at 70°C for 3 times, each time for 12 hours. Then the wet gel was subjected to carbon dioxide supercritical drying treatment, the reaction temperature was 70°C, the pressure in the autoclave was 12...

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Abstract

The invention relates to a preparation method of a fiber-reinforced Al2O3-SiO2 aerogel material with a wave transmission and heat insulation integrated function. The preparation method includes mixing a silicon source with an aluminum source, subjecting the mixture to hydrolysis reaction, taking epoxide as a coagulant, functional powder with excellent wave transmission performance as an additive and inorganic high-temperature-resistant ceramic fibers as a reinforcement body, performing melting-gelling, ageing and supercritical drying to obtain precursor compound aerogel, and subjecting the precursor compound aerogel to air heat calcination in a muffle furnace to finally obtain the fiber-reinforced Al2O3-SiO2 aerogel material with the wave transmission and heat insulation integrated function. The preparation method has the advantages of simplicity of raw materials, simplicity and convenience in process, simplicity in technological process operation and easiness in mass production.

Description

technical field [0001] The invention belongs to the field of preparation technology of airgel materials, and relates to a wave-transparent and heat-insulating integrated fiber-reinforced Al 2 o 3 -SiO 2 Preparation method of airgel material. Background technique [0002] Aviation weaponry plays a huge role in modern warfare and has become a key factor affecting the outcome of a war. Especially with the continuous increase of the flight speed of hypersonic vehicles such as missiles, the problem of high temperature thermal environment caused by aerodynamic heating has become more and more severe. When a hypersonic vehicle flies at a speed of Mach 4-5, the temperature of the outer surface of the cabin can reach 400-600°C. With the advent of aircraft and aerospace aircraft, the flight speed of these aircraft will be as high as Mach 8 or more, and the reentry process will last for about 10 minutes, resulting in a wide field of view suitable for installing radome, such as the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02C04B38/00
CPCC04B30/02C04B2201/32C04B2201/20C04B14/303C04B14/06C04B38/0045C04B38/0067
Inventor 沈晓冬吴晓栋邵高峰崔升李砚涵刘思佳
Owner NANJING UNIV OF TECH
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