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High temperature-resistant mullite type aerogel composite material and preparation method thereof

A composite material and airgel technology, applied in the field of mullite airgel composite materials and its preparation, can solve the problems of porous structure collapse, poor stability, unstable performance, etc., and achieve uniform properties of sol and gel Effect

Active Publication Date: 2017-06-16
北京华夏特材科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Silica airgel composite material is the most widely studied and applied material, with good formability and moderate strength, but because silica airgel is easy to sinter at high temperature, the porous structure collapses, the stability is poor, and the high temperature section is almost transparent to infrared. , thus, silica aerogels are generally used in environments below 700°C
Commonly used infrared shielding agents include silicon carbide, titanium dioxide, potassium hexatitanate whiskers and zirconium quartz (the application of infrared shielding agents in high-temperature-resistant and high-performance heat insulation materials). average, making the final performance unstable

Method used

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Effect test

Embodiment 1

[0034] Such as figure 1 As shown, the preparation method of a high temperature resistant mullite airgel composite material of the present embodiment comprises the following steps:

[0035] S1, hydrolyzing silicon source, aluminum source and titanium source respectively to obtain silica sol, aluminum sol and titanium sol;

[0036] Described silicon source comprises tetraethoxysilane and methyltriethoxysilane, and the mol ratio of described tetraethoxysilane and methyltriethoxysilane is 1:0.1; The molar concentration of silicon element is adjusted to 0.5mol / L.

[0037] The aluminum source is aluminum isopropoxide; the aluminum sol is obtained by wetting, ball milling, chelating, heat preservation, acidolysis and concentration, and the mole of aluminum element in the aluminum sol is obtained by water The concentration was adjusted to 0.5mol / L.

[0038] The titanium source is butyl titanate; the butyl titanate is chelated, diluted and hydrolyzed to obtain the titanium sol, and ...

Embodiment 2

[0044] Such as figure 1 As shown, the preparation method of a high temperature resistant mullite airgel composite material of the present embodiment comprises the following steps:

[0045] S1, hydrolyzing silicon source, aluminum source and titanium source respectively to obtain silica sol, aluminum sol and titanium sol;

[0046] Described silicon source comprises tetraethoxysilane and methyltriethoxysilane, and the mol ratio of described tetraethoxysilane and methyltriethoxysilane is 1:0.3; The molar concentration of silicon element is adjusted to 0.8mol / L.

[0047] The aluminum source is aluminum isopropoxide; the aluminum sol is obtained by wetting, ball milling, chelating, heat preservation, acidolysis and concentration, and the mole of aluminum element in the aluminum sol is obtained by water The concentration was adjusted to 0.8mol / L.

[0048] The titanium source is butyl titanate; the butyl titanate is chelated, diluted and hydrolyzed to obtain the titanium sol, and ...

Embodiment 3

[0054] Such as figure 1 As shown, the preparation method of a high temperature resistant mullite airgel composite material of the present embodiment comprises the following steps:

[0055] S1, hydrolyzing silicon source, aluminum source and titanium source respectively to obtain silica sol, aluminum sol and titanium sol;

[0056] Described silicon source comprises tetraethoxysilane and methyltriethoxysilane, and the mol ratio of described tetraethoxysilane and methyltriethoxysilane is 1:0.5; The molar concentration of silicon element was adjusted to 1.0mol / L.

[0057] The aluminum source is aluminum isopropoxide; the aluminum sol is obtained by wetting, ball milling, chelating, heat preservation, acidolysis and concentration, and the mole of aluminum element in the aluminum sol is obtained by water The concentration was adjusted to 1.0 mol / L.

[0058] The titanium source is butyl titanate; the butyl titanate is chelated, diluted and hydrolyzed to obtain the titanium sol, an...

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Abstract

The invention relates to a high temperature-resistant mullite type aerogel composite material and a preparation method thereof. The preparation method comprises the following steps: 1, respectively hydrolyzing a silicon source, an aluminum source and a titanium source to obtain silica sol, alumina sol and titanium sol; 2, compounding the silica sol, alumina sol and titanium sol according to a preset volume ratio to form composite soil; and carrying out standing gelling on the composite soli to obtain composite gel, and drying the composite gel to obtain the aerogel material; or impregnating a fiber coil or a prefabricated component in the composite sol, carrying out standing gelling to obtain a wet gel composite material, and drying the wet gel composite material to obtain the aerogel material. The silicon-aluminum-titanium ternary composite sol is prepared, the formula is flexibly blended through a single-component stable sol system, all functional components are obtained through compounding active nano-sol particles, and the sols and the gel have homogenous properties and have no phase separation phenomenon.

Description

technical field [0001] The invention relates to the technical field of multi-component airgel prepared by sol-gel, in particular to a high-temperature-resistant mullite-type airgel composite material and a preparation method thereof. Background technique [0002] Airgel is a porous material composed of nano-skeleton structure and the pores formed therein, with extremely high porosity (>90%). Due to the special structural characteristics of airgel, it can effectively inhibit heat conduction and convection. It is recognized as the solid material with the best thermal insulation performance (the thermal conductivity can be as low as 0.007W / (m K)), and it is also considered It is one of the most promising materials in the future. [0003] With the development of aerospace industry and high temperature smelting technology, higher and higher requirements are put forward for thermal insulation materials. Although traditional refractory fibers such as aluminum silicate fiber an...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/66C04B35/185C04B35/624C04B35/626
CPCC04B35/185C04B35/624C04B35/62655C04B35/66C04B38/0045C04B2235/3218C04B2235/3234C04B2235/3418C04B2235/606C04B38/0074C04B38/0067
Inventor 姜成英刘薇
Owner 北京华夏特材科技发展有限公司
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