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Modified aluminum oxide aerogel composite material and preparation 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 excellent thermal insulation, excellent mechanical properties, and reduce solid heat transfer effects.

Active Publication Date: 2011-01-26
海鹰空天材料研究院(苏州)有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome one or more or even all of the above-mentioned problems in the prior art, especially the problem that the high-temperature structure of a single pure alumina airgel is unstable due to crystal transformation at high temperature, which affects its high-temperature thermal insulation performance, and uses The specificity of the large sol particles of the silica sol aqueous solution system further solves the problem of improving the high temperature stability of the silica-alumina airgel composite material.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0051] (1) Preparation of aluminum sol prefabricated solution: mix aluminum salt, chelating agent, and aluminum sol solvent evenly to prepare aluminum sol prefabricated solution;

[0052] (2) Preparation of the silica-alumina composite sol: adding the silica sol aqueous solution to the alumina sol prefabricated solution and mixing, then adding an alkaline catalyst, and hydrolyzing to obtain the silica-alumina composite sol;

[0053] (3) 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;

[0054] (4) Gelling: placing the mixture in an environment of 60° C. to 80° C. to gel the silica-alumina composite sol in the mixture to obtain a silica-alumina composite gel;

[0055] (5) Aging: Aging for 24 hours to 48 hours by adding an alcohol solvent for aging; and

[0056] (6) Supercritical drying: performing supercritical dryin...

Embodiment 1

[0079] 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 1%. The silica sol aqueous solution used is a silica sol low-sodium aqueous solution (silicon content is 25%, sodium content is 2 The molar ratio relative to the silicon-aluminum composite airgel is calculated as 1%. After the aluminum salt, the chelating agent and the aluminum sol are formulated into a mixed solution, the aqueous solution of the silica sol is added, and then ammonia water as a basic catalyst is added to prepare the silica-aluminum composite sol. Then, directly add the silica-alumina composite sol into the container with a bulk density of 0.2g / cm 3 , In a mold of aluminum silicate fiber material with a single fiber diameter of 1 μm, it is impregnated by gravity. Carry out gelation ...

Embodiment 2

[0081] 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 5%. The silica sol aqueous solution used is a low-sodium silica sol aqueous solution with a silicon content of 25%. Materials used also include aluminum sec-butoxide, ethyl acetoacetate, ethanol and ammoniacal liquor (the molar ratio is 1: 0.001: 16: 3: 0.002), and the addition amount of silica sol aqueous solution is based on making the SiO in the silicon-aluminum composite airgel 2 The molar ratio relative to the silicon-aluminum composite airgel is calculated as 5%. The same method similar to Example 1 was used to prepare the silica-alumina composite sol. Then, directly add the silica-alumina composite sol into the container with a bulk density of 0.2g / cm 3 , In the mold of mullite fiber with a single fiber...

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Abstract

The invention provides a silicon-aluminum aerogel composite material which comprises silicon-aluminum composite aerogel (1) and an inorganic fiber material (2), wherein the silicon-aluminum composite aerogel is prepared from a silicasol aqueous solution. The invention also provides a method for preparing the silicon-aluminum aerogel composite material, which comprises the steps of preparing the silicon-aluminum composite aerogel, dipping sol, gelatinizing, ageing, overcritically drying and the like. With excellent high-temperature resistance, good mechanical property and low thermal conductivity at high temperature, the silicon-aluminum aerogel composite material can meet the high requirement of thermal protection in the fields of aviation, aerospace and military affairs and can also be applied to the field of civil heat insulation.

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] Traditional thermal insulation materials have high density and high mass, which greatly limits their use on aircraft. Compared with traditional thermal insulation materials, nanoporous airgel thermal insulation materials achieve equivalent thermal insulation effects with lighter weight and smaller volume, and are favored by material researchers in the aerospace field of various countries. Airgel has a unique three-dimensional nano-network structure (skeleton 2-5nm), high specific surface area (500-1200m 2 / g), nanometer-sized pores (about 20nm), the porosity is as high as 95%, which can effectively inhibit solid-state heat conduction and gas convective heat transfer, and is currently the solid material with the lowest thermal conductivity (0.015W / m K at room temperature) , so it is also...

Claims

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Application Information

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IPC IPC(8): C04B30/02
CPCC04B30/02C04B2111/28C04B14/064C04B14/303C04B14/38C04B38/0045C04B40/02
Inventor 艾素芬邹军锋张昊张继承詹万初
Owner 海鹰空天材料研究院(苏州)有限责任公司
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