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A fiber-reinforced al2o3-sio2 airgel high-efficiency thermal insulation composite material and its preparation method

A technology of al2o3-sio2 and composite materials, which is applied in the field of inorganic materials, can solve the problems of low opacifying agent addition, uneven distribution, and poor high-temperature heat insulation performance of materials, so as to improve high-temperature heat insulation performance and stability, and process The effect of simplicity, excellent thermal insulation performance and high temperature stability

Active Publication Date: 2019-05-24
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle size of the opacifying agent is generally on the order of a few microns, and it is difficult to impregnate the inside of the fiber mat, so that the amount of opacifying agent added is low and the distribution is uneven, resulting in poor thermal insulation properties of the material

Method used

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  • A fiber-reinforced al2o3-sio2 airgel high-efficiency thermal insulation composite material and its preparation method

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preparation example Construction

[0025] A fiber reinforced Al 2 o 3 -SiO 2 A method for preparing an airgel high-efficiency thermal insulation composite material, the specific steps of the method are:

[0026](1) Determine the number of layers of fiber felt or fiber paper according to the thickness of the required heat insulation material, spread the opacifying agent particles evenly on the fiber felt or fiber paper, then stack the fiber felt or fiber paper together, and then use aluminum oxide The fiber thread sews the fiber mat or fiber paper together and fixes it; according to the temperature environment of the heat insulation material, the content of opacifying agent on each layer of fiber mat or fiber paper can be different, the content of opacifying agent in the high temperature part is high, and the content of opacifying agent in the low temperature part is low , to realize the gradient distribution of the opacifying agent content in the thickness direction.

[0027] (2) Stir the mixture of aluminum...

Embodiment 1

[0034] (1) Take 200mm×200mm×5mm alumina fiber felt (density 0.128g / cm 3 ) 4 sheets, and evenly spread 1.0g of zirconium silicate powder on 3 of the fiber mats, stack the above 4 fiber mats neatly, put the fiber mat without zirconium silicate on the top layer, and use alumina fiber wire to Fiber mats are sewn together;

[0035] (2) Mix 127.0g of aluminum sec-butoxide, 375.0g of absolute ethanol and 5.0g of deionized water in a 60°C water bath and stir for 60min to obtain a clear and transparent alumina sol;

[0036] (3) 1.35g of silica nanopowder is added to the alumina sol, and stirred until uniformly dispersed;

[0037] (4) Add 69.0 g of methanol, 1.5 g of deionized water, and 1.3 g of acetic acid to the sol obtained in step (3), and after stirring evenly, impregnate the fiber mat in (1); let it stand until it gels;

[0038] (5) Put the material in (4) into absolute ethanol, age for 3 days, and replace absolute ethanol 3 times in the middle;

[0039] (6) The material in (5...

Embodiment 2

[0042] (1) Take 200mm×200mm×3mm alumina fiber felt (density 0.096g / cm 3 ) 8 pieces, and evenly spread 0.8g of zirconium silicate powder on 7 pieces of fiber mats, stack the above 8 pieces of fiber mats neatly, put the fiber mats without zirconium silicate on the top layer, and use alumina fiber wire to Fiber mats are sewn together;

[0043] (2) Mix 369g of aluminum sec-butoxide, 414g of absolute ethanol and 5.4g of deionized water in a 60°C water bath and stir for 60min to obtain a clear and transparent alumina sol;

[0044] (3) Add 27g of fumed silica to the alumina sol, and stir until uniformly dispersed;

[0045] (4) Add 84 g of ethanol, 0.9 g of deionized water, and 1.1 g of acetic acid to the sol obtained in step (3), impregnate the fiber mat in (1), and let it stand until it gels;

[0046] (5) Put the material in (4) into absolute ethanol, age for 3 days, and replace absolute ethanol 3 times in the middle;

[0047] (6) The material in (5) is subjected to supercritical...

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Abstract

The invention relates to a fiber-enhanced Al2O3-SiO2 aerogel efficient heat isolation composite material and a preparation method thereof. The composite material is prepared from the following ingredients in percentage by mass: 25 percent to 90 percent of Al2O3-SiO2 aerogel base bodies, 5 percent to 45 percent of enhanced fiber and 5 percent to 30 percent of light-shielding agents, wherein the light shielding agents are zirconium dioxide or zirconium silicate. The highest use temperature of the prepared material can reach 1200 DEG C; good heat insulation performance is realized in the range of 25 DEG C to 1200 DEG C.

Description

technical field [0001] The invention discloses a fiber reinforced Al 2 o 3 -SiO 2 The invention discloses an airgel high-efficiency thermal insulation composite material and a preparation method thereof, belonging to the field of inorganic materials. Background technique [0002] Airgel materials have low density, high porosity, and low thermal conductivity. They can be used as large-area thermal insulation materials for hypersonic aircraft, and can also be used as thermal insulation materials for buildings, kilns, etc. With the increasing shortage of energy worldwide, aerogels with excellent thermal insulation properties have become one of the hot research areas of efficient thermal insulation materials. Currently, the SiO 2 Doped or modified fiber reinforced Al 2 o 3 -SiO 2 The highest service temperature of airgel composite insulation materials can reach 1200°C (Chem. Mater., 2013, 25, 4757-4764.). [0003] Although fiber-reinforced airgel insulation technology ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B30/02
CPCC04B30/02C04B2201/32C04B14/303C04B14/06C04B14/4625C04B14/306C04B14/046C04B38/0045
Inventor 李俊宁杨海龙吴文军徐云辉胡子君
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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