High-temperature resistant aluminium oxide aerogel heat-proof composite material and method for making same

A technology of alumina aerogel and composite material, which is applied in the field of high temperature resistant alumina aerogel heat insulation composite material and its preparation, can solve the problems of high brittleness, low strength, poor ability to block infrared radiation, etc., and achieves a small pore size , high porosity, good barrier effect

Active Publication Date: 2007-09-26
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] The first purpose of the present invention is to solve the problems of low strength and high brittleness of the existing alumina airgel materials, and to provide a high-temperature-resistant aluminum alloy with excellent high-efficiency heat insulation performance and high-temperature resistance, as well as good mechanical properties. Alumina airgel thermal insulation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The product of this embodiment is composed of aluminum silicate fiber felt and alumina airgel.

[0017] Preparation method: Mix aluminum sec-butoxide, absolute ethanol, and deionized water in a molar ratio of 1:16:0.6, heat to 60°C with a reflux device and stir for 45 minutes. The formed sol is colorless and transparent. When the sol drops to room temperature , adding methanol, deionized water and glacial acetic acid mixture to obtain alumina sol, wherein the molar ratio of methanol, deionized water and glacial acetic acid to aluminum sec-butoxide is 5: 0.168: 0.448: 1; The bulk density is 0.20g / cm 3 In the aluminum silicate fiber felt mold, make the two compound, gel after 1 hour, then add absolute ethanol to make it soak the sample, aging at room temperature for 2 days, put it into the autoclave, pre-filled with N 2 To 2MPa, heat up to 270°C at a rate of 1°C / min, keep the temperature constant for 1 hour, release the pressure slowly at a rate of 70KPa / min, after reach...

Embodiment 2

[0019] The product of this embodiment is composed of mullite fiber preform and alumina airgel doped with opacifying agent.

[0020] Preparation method: Mix aluminum isopropoxide, isopropanol, and deionized water in a molar ratio of 1:12:0.6, heat to 80°C with a reflux device and stir for 50 minutes. When the sol drops to room temperature, add methanol, deionized water, and Alumina sol was obtained from the oxalic acid mixture, wherein the molar ratio of methanol, deionized water, glacial acetic acid to aluminum sec-butoxide was 6:0.1:0.622:1. According to the ratio of alumina sol and opacifying agent of 100ml / lg, titanium dioxide was added and stirred for 10 minutes to disperse to obtain doped alumina sol. Set the bulk density to 0.18g / cm 3 The mullite fiber preform is mixed with alumina sol doped with titanium dioxide, gels after 0.5 hours, then isopropanol is added to soak the sample, aged at room temperature for 1 day, and then placed in an autoclave , pre-filled with 1.0...

Embodiment 3

[0022] The product of this embodiment is composed of aluminum silicate fiber felt and alumina airgel.

[0023] Preparation method: Mix aluminum nitrate, absolute ethanol, and deionized water at a molar ratio of 1:32:4, heat to 60°C with a reflux device and stir for 50 minutes, and when the sol drops to room temperature, add methanol, deionized water, and oxalic acid to mix Alumina sol was obtained from the solution, wherein the molar ratio of methanol, deionized water and oxalic acid to aluminum sec-butoxide was 8:0.25:0.448:1. Set the bulk density to 0.15g / cm 3 The aluminum silicate fiber felt is mixed with alumina sol, after 0.5 hours of gelation, absolute ethanol is added to make it soaked in the sample, aged at room temperature for 1.5 days, then put into an autoclave, pre-filled with N 2 to 0.5MPa, heat up to 270°C at a rate of 1°C / min, keep the temperature constant for 1 hour, release the pressure slowly at a rate of 100KPa / min, and then release the pressure with N 2 R...

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Abstract

The invention discloses a thermostable aluminum oxide aerogel heat-proof composite material and preparing method, which comprises the following steps: allocating aluminum oxide collosol; mixing inorganic ceramic fiber felt and inorganic ceramic fiber precast product; aging; drying; getting the product. This composite material possesses good mechanics behavior, compactibility, high factor of porosity, small bore diameter and good obstruct action for solid heat diffusion and convection of air heat diffusion, which can meet the need of aviation, aerospace, military and household.

Description

technical field [0001] The invention relates to an airgel heat-insulating composite material and a preparation method thereof, in particular to a high-temperature-resistant alumina airgel heat-insulation composite material and a preparation method thereof. Background technique [0002] With the development of the aerospace industry, the requirements of aircraft for thermal insulation materials are becoming more and more stringent. The heat insulation effect and mechanical properties of the high temperature section can no longer meet the requirements of practical applications. Therefore, the use of nanotechnology to develop airgel thermal insulation composite materials has become the leading direction for the development of high-efficiency thermal insulation materials. This is because airgel materials are considered to be solid materials with the best thermal insulation properties due to their high porosity and fine nanoporous network structure, whi...

Claims

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Application Information

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IPC IPC(8): C09K3/18
Inventor 冯坚张长瑞高庆福冯军宗武纬
Owner NAT UNIV OF DEFENSE TECH
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