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Silicon-aluminium aerogel composite material and manufacturing method thereof

A composite material and aerogel technology, applied in the field of materials, can solve the problems affecting high temperature thermal insulation performance, high temperature structural instability, etc., and achieve the effects of excellent mechanical properties, excellent thermal insulation performance, and low and high temperature thermal conductivity.

Active Publication Date: 2010-04-28
海鹰空天材料研究院(苏州)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome one or more or even all of the above-mentioned problems existing in the prior art, especially the problem that a single pure alumina airgel is unstable at high temperature due to crystal transformation at high temperature and thus affects its high-temperature thermal insulation performance, the present invention The following technical solutions are provided:

Method used

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  • Silicon-aluminium aerogel composite material and manufacturing method thereof

Examples

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preparation example Construction

[0051] (1) Preparation of silica sol: silica sol is formulated with silicon alkoxide, solvent for silica sol, catalyst for silica sol and water;

[0052] (2) Preparation of aluminum sol: aluminum salt, chelating agent, solvent for aluminum sol and catalyst and water for aluminum sol are mixed with aluminum sol;

[0053] (3) Preparation of silicon-aluminum composite sol: mix the silica sol and the aluminum sol uniformly to obtain the silicon-aluminum composite sol, preferably, according to making the SiO in the silicon-aluminum composite aerogel 2 Mixing the silica sol and the aluminum sol in a ratio of 0.01% to 100% based on the moles of the silicon-aluminum composite airgel;

[0054] (4) Dipping: the silicon-aluminum composite sol is immersed in the inorganic fiber material through an impregnation process to obtain a mixture of the silicon-aluminum composite sol and the inorganic fiber material;

[0055] (5) Gelling: the mixture obtained in step (4) is placed in an environme...

Embodiment 1

[0083] The silica-alumina airgel composite material prepared in this example is an aluminum silicate fiber reinforced silica-alumina airgel composite material, and the SiO in the silica-alumina composite airgel 2 The molar ratio relative to the silicon-aluminum composite airgel is 10%. The silica sol is prepared under the following conditions: methyl orthosilicate, absolute ethanol, deionized water, and ammonia water in a molar ratio of 1:1:1:0.0002, and a basic catalyst to form a silica sol. The preparation conditions of the aluminum sol are that the molar ratio of aluminum sec-butoxide, ethyl acetoacetate, ethanol, water and ammonia water is 1: 0.001: 16: 3: 0.002, and the aluminum sol is formulated with a basic catalyst, and then the obtained Silica sol and aluminum sol are mixed evenly to prepare silicon-aluminum composite sol, and the mixing ratio of silica sol and aluminum sol is based on making the SiO in the silicon-aluminum composite airgel 2 The molar ratio relative...

Embodiment 2

[0085] The silicon-aluminum airgel composite material prepared in this embodiment is mullite fiber reinforced silicon-aluminum composite airgel, and the SiO in the silicon-aluminum composite airgel 2 The molar ratio relative to the silicon-aluminum composite airgel is 40%. The silica sol is prepared under the following conditions: tetraethyl orthosilicate, absolute ethanol, deionized water, and ammonia water in a molar ratio of 1:1:1:0.0002, and a basic catalyst to form a silica sol. The preparation conditions of the aluminum sol are that the molar ratio of aluminum isopropoxide, acetylacetone, ethanol, water and ammonia water is 1: 0.01: 12: 4: 0.002, and the aluminum sol is formulated with a basic catalyst, and then the prepared silicon The sol and the aluminum sol are uniformly mixed to prepare the silicon-aluminum composite sol. Directly add the silica-alumina composite sol to the container with a bulk density of 0.2g / cm 3 , In the mold of mullite fiber with a single fib...

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Abstract

The invention provides a silicon-aluminium aerogel composite material, comprising (1) silicon-aluminium compound aerogel and (2) inorganic fiber material. The invention further provides a method for manufacturing silicon-aluminium aerogel composite material with simple technology, comprising the steps of preparing silica sol, preparing aluminium sol, preparing silicon-aluminium compound sol, dipping sol, gelatinizing, ageing, overcritical drying, etc. With excellent high-temperature resistant performance, nice mechanical property and lower thermal conductivity at high temperature, the silicon-aluminium aerogel composite material can meet the high demand of thermal protection in respect of aviation, space flight and military affairs and can be applied to the civil heat insulation field.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to an airgel composite material and a preparation method thereof. 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 of airgel (<50nm) is smaller than the mean free pat...

Claims

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Application Information

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IPC IPC(8): C04B30/02
CPCC04B30/02C04B2111/28C04B2111/00982
Inventor 艾素芬詹万初张继承邹军锋张昊赵英民
Owner 海鹰空天材料研究院(苏州)有限责任公司
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