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Preparation method of high-temperature-resistant aluminum oxide-silicon oxide aerogel composite material

A silica airgel and composite material technology, applied in the field of thermal insulation materials, can solve the problems of poor infrared radiation blocking ability, difficult forming, low strength, etc., achieve good thermal insulation performance and mechanical properties, increase the degree of compactness, Effect of suppressing heat conduction

Pending Publication Date: 2021-12-24
GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inherent low strength, high brittleness, poor ability to block infrared radiation, and difficulty in forming of alumina-silica airgel materials limit the application of alumina-silica airgel in industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: A kind of preparation method of high temperature resistant alumina-silica airgel composite material, it is characterized in that, the steps are as follows:

[0028] (1) Fully disperse and mix nano-alumina airgel powder, micron silicon carbide infrared light-shielding agent and alumina short fiber to obtain mixture A, wherein, in parts by mass, nano-alumina airgel powder: micron carbonization Silicon infrared sunscreen agent: alumina short fiber=60:45:8;

[0029] (2), the mixture A in the step (1) was pressed and formed under 7.5MPa, and kept under pressure for 40s to obtain an alumina composite material;

[0030] (3) Preparation of silica sol: Mix silicon source, ethanol and water evenly, then add catalyst and stir evenly to obtain silica sol;

[0031] (4) Impregnation treatment: pressurize and impregnate the alumina composite material obtained in step (2) into the silica sol obtained in step (3) to obtain an alumina-silica wet gel material;

[0032] (5)...

Embodiment 2

[0037] A method for preparing a high-temperature resistant alumina-silica airgel composite material, characterized in that the steps are as follows:

[0038] (1) Fully disperse and mix nano fumed alumina powder, micron alumina airgel powder, micron zirconia infrared sunscreen, chopped glass fiber and chopped mullite fiber to obtain a mixture A, wherein In parts, nanometer fumed alumina powder: micron alumina airgel powder: micron zirconia infrared sunscreen agent: chopped glass fiber: chopped mullite fiber=55:4:40:3:2;

[0039] (2), the mixture A in the step (1) was pressed and formed under 6MPa, and the pressure was maintained for 70s to obtain an alumina composite material;

[0040] (3) Preparation of silica sol: Mix silicon source, ethanol and water evenly, then add catalyst and stir evenly to obtain silica sol;

[0041] (4) Impregnation treatment: immerse the alumina composite material obtained in step (2) in the silica sol obtained in step (3) under normal pressure to ob...

Embodiment 3

[0046] A method for preparing a high-temperature resistant alumina-silica airgel composite material, characterized in that the steps are as follows:

[0047] (1) Fully disperse and mix nano-alumina airgel powder, nano-fumed alumina powder, nano-titanium dioxide infrared sunscreen and chopped carbon fiber to obtain a mixture A, wherein, in parts by mass, nano-alumina airgel Powder: nano fumed alumina powder: nano titanium dioxide infrared sunscreen agent: chopped carbon fiber=20:25:35:2;

[0048] (2), the mixture A in the step (1) is pressed and formed under 5 MPa, and the pressure is maintained for 100s to obtain an alumina composite material;

[0049] (3) Preparation of silica sol: Mix silicon source, ethanol and water evenly, then add catalyst and stir evenly to obtain silica sol;

[0050] (4) Impregnation treatment: pressurize and impregnate the alumina composite material obtained in step (2) into the silica sol obtained in step (3) to obtain an alumina-silica wet gel mate...

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Abstract

The invention discloses a preparation method of a high-temperature-resistant aluminum oxide-silicon oxide aerogel composite material, wherein the preparation method comprises the following steps: (1) sufficiently dispersing and mixing nano aluminum oxide powder, micron aluminum oxide powder, an infrared opacifying agent and short fibers to obtain a mixture A; (2) performing compression molding on the mixture A to obtain an aluminum oxide composite material; (3) uniformly mixing a silicon source, ethanol and water to obtain silicon dioxide sol; (4) dipping the aluminum oxide composite material by adopting silicon dioxide sol; and (5) performing drying treatment to obtain the high-temperature-resistant aluminum oxide-silicon oxide aerogel composite material. According to the preparation method disclosed by the invention, compounding of aluminum oxide and silicon oxide aerogel is realized through impregnation, a complex preparation process is avoided, the preparation period is shortened, the silicon oxide aerogel is fixed in the aluminum oxide composite material, the compactness of the aluminum oxide composite material is further increased, the composite material has relatively good mechanical properties, and great shrinkage of the aluminum oxide composite material at high temperature is avoided.

Description

technical field [0001] The invention belongs to the field of thermal insulation materials, and in particular relates to a preparation method of a high-temperature-resistant alumina-silica airgel composite material. Background technique [0002] As the flight speed of the aircraft is getting faster and the surface temperature is getting higher and higher, the thermal insulation effect and mechanical properties of conventional aluminum silicate or mullite fibers can no longer meet the thermal protection requirements of aerospace vehicles in the high temperature section. The use of nano-airgel thermal insulation composites has become the leading direction for efficient thermal insulation. [0003] Airgel is currently the most ideal lightweight thermal insulation material. It is a lightweight, amorphous and porous solid material composed of nano colloidal particles or polymer molecules. It has extremely low density, high specific surface area and high porosity. . The pore size...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02C04B38/00
CPCC04B30/02C04B2201/32C04B14/064C04B14/303C04B20/008C04B14/324C04B14/4625C04B38/0045C04B14/306C04B14/42C04B14/4656C04B14/305C04B14/386
Inventor 张东生董会娜姚栋嘉张继承刘喜宗吴恒赵严潘广镇李帅帅
Owner GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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