Preparation method of high-temperature-resisting aerogel material

An airgel and high-temperature-resistant technology, which is applied in the field of preparation of high-temperature-resistant airgel materials, can solve problems such as insufficient temperature resistance, potential safety hazards, and failure to consider material temperature resistance, so as to overcome shrinkage, inhibit sintering, The effect of inhibiting growth

Active Publication Date: 2018-07-06
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, this method uses ethanol as the medium in the supercritical drying process, and the process needs to be heated to 300°C, which has many potential safety hazards, and this method does not consider the temperature resistance of the material above 1200°C
For the improvement of the temperature resistance of alumina, researchers believe that doping other oxides is an effective method, but it only improves the crystal transformation and inhibits sintering to a certain extent. At present, it is prepared by doping other oxides. The aerogel still has the problem of insufficient temperature resistance

Method used

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  • Preparation method of high-temperature-resisting aerogel material
  • Preparation method of high-temperature-resisting aerogel material
  • Preparation method of high-temperature-resisting aerogel material

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[0036] The present invention provides a kind of preparation method of high temperature resistant airgel material, described method comprises the following steps:

[0037] (1) Preparation of sol: Silicone sol is prepared by using organosilicon ester as raw material, acid reagent as catalyst and organic solvent as dispersant. The organic silicon ester is preferably methyl orthosilicate or ethyl orthosilicate; the acidic reagent is selected from the group consisting of hydrochloric acid, hydrofluoric acid and nitric acid, and the concentration of the acidic reagent is 0.001~0.1mol / L ( For example, 0.001, 0.005, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09 or 0.1mol / L); the organic solvent is selected from the group consisting of methanol, ethanol, acetone and acetonitrile.

[0038] (2) Nanocrystal assembly process: dissolving oxide nanopowder in an organic solvent to obtain the first mixed solution, then adding the silica sol prepared in step (1) to the first mixed soluti...

Embodiment 1

[0054] ①sol preparation

[0055] Weigh 160 g of methyl orthosilicate and 160 g of acetonitrile into a 500 mL beaker, seal it with a plastic wrap and perform magnetic stirring for 1 min. After mixing evenly, add 60g of hydrochloric acid with a concentration of 0.003mol / L as a catalyst. This process needs to be added slowly and stirred by magnetic force for 5 minutes; add the above mixed solution into a 1000mL three-necked flask, heat and magnetically stir at 70°C, And accompanied by reflux for 30 minutes, the first solution of the siliceous sol precursor was obtained; 160 g of methyl orthosilicate was added to the obtained first solution of the siliceous sol precursor, and heating and magnetic stirring were continued at 70° C., and the reaction was carried out for 16 hours. A siliceous sol (silica sol) is obtained. Dilute the siliceous sol, distill 300 g of the solvent contained in the siliceous sol, add 600 g of acetonitrile and mix evenly to obtain the diluted siliceous sol,...

Embodiment 2

[0068] Embodiment 2 is basically the same as Embodiment 1, except that: during the heat treatment process, the heat treatment temperature is 1100°C.

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Abstract

The invention relates to a preparation method of a high-temperature-resisting aerogel material. The method comprises the following steps: (1) preparing sol; (2) carrying out a nano-crystal assemblingprocess to prepare aerogel wet gel which takes an oxide nano-crystal as a framework; (3) preparing an aerogel material; (4) carrying out a heat treatment process to prepare the high-temperature-resisting aerogel material. According to the preparation method provided by the invention, a nano-crystal assembling technology and heat treatment are combined to prepare the high-temperature-resisting aerogel material with a microcosmic core-shell structure; the core-shell structure forms a network framework under high temprature so that the growth of the oxide nano-crystal is inhibited and the shrinkage problem caused by the fact that the structure of oxide aerogel collapses in a high-temperature utilization process is effectively solved. The aerogel material prepared by the preparation method hasa good high-temperature-resisting property; the heat-resisting temperature is 1000 DEG C or more and the high-temperature-resisting aerogel material even can bear the high temperature of 1300 DEG C or more.

Description

technical field [0001] The invention relates to the technical field of airgel preparation, in particular to a preparation method of a high-temperature-resistant airgel material. Background technique [0002] Due to its high porosity and fine nanoporous network structure, airgel materials can effectively inhibit heat conduction and heat convection. It is considered to be the solid material with the best thermal insulation performance, and has been widely used in various spacecraft and aircraft. under heat protection. At present, there are many researches on silica airgel thermal insulation materials at home and abroad. It is a very effective material in the field of medium temperature insulation, but silica airgel has poor high temperature stability, and the long-term use temperature is not higher than 650°C. , so it is difficult to apply in a higher temperature environment. Therefore, seeking high-temperature-resistant airgel thermal insulation composite materials is the m...

Claims

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Application Information

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IPC IPC(8): C04B35/117C04B35/14C04B35/488C04B35/63C04B35/622C04B38/00
CPCC04B35/117C04B35/14C04B35/488C04B35/622C04B35/6316C04B38/0045C04B2235/77C04B2235/9615C04B2235/963C04B2235/6562C04B2235/6567C04B38/0054C04B38/0067C04B38/0074
Inventor 张恩爽刘韬刘斌李文静胡杨赵英民裴雨辰
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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