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A kind of high temperature resistant al-si-b-o ceramic airgel material and its synthesis method

A technology of al-si-b-o and synthesis method, which is applied in the direction of ceramic products, other household utensils, household utensils, etc., and can solve the problems of low use temperature of airgel and poor heat insulation performance at high temperature

Active Publication Date: 2021-09-14
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical defects of low airgel use temperature and poor high-temperature heat insulation performance in the prior art, the present invention provides a high-temperature-resistant Al-Si-B-O ceramic airgel material and its synthesis method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix aluminum sec-butoxide, ethanol, and deionized water at a molar ratio of 1:13:0.8, stir at 60°C for 30 minutes to form a clear and transparent solution, cool to room temperature to obtain aluminum sol; mix ethyl orthosilicate, deionized water , ethanol, and nitric acid were mixed and uniformly stirred at a molar ratio of 1:10:15:0.1 to obtain silica sol; aluminum sol, silica sol, and trimethyl borate were mixed and stirred at aluminium:silicon:boron molar ratio 1:0.3:0.5 respectively Evenly, add the mixed solution of methanol, deionized water, and acetic acid (the amount of the mixed solution added is 4:0.16:0.45:1 according to the molar ratio of the three to aluminum), stir and mix evenly, tightly cover the lid of the hydrothermal kettle, and let it stand. After 2 hours, the gel was formed, and the gel was sealed and aged for 24 hours, and supercritically dried with ethanol as a medium to obtain a high-temperature-resistant Al-Si-B-O ceramic airgel material. The pre...

Embodiment 2

[0024] Mix aluminum isopropoxide, ethanol, and deionized water at a molar ratio of 1:22:5, stir at 60°C for 40 minutes to form a clear and transparent solution, cool to room temperature to obtain aluminum sol; mix methyl orthosilicate, deionized water , ethanol, and nitric acid are mixed and uniform at a molar ratio of 1:10:15:0.1, and stirred to obtain a silica sol; aluminum sol, silica sol, and trimethyl borate are respectively pressed at aluminium: silicon: a boron molar ratio of 1:0.25:0.3 is mixed and Stir evenly, mix acetylacetone, methanol and aluminum in a molar ratio of 0.5:8:1 to form a catalyst, add the catalyst to the mixed sol according to the amount of 1mL catalyst per 20mL sol, stir vigorously for 10min, and let it stand for 2 hours to form a gel. The gel is subjected to supercritical drying with ethanol as a medium and heat-treated at 1000°C for 0.5h to obtain a high-temperature-resistant Al-Si-B-O ceramic airgel material. The specific surface area of ​​ceramic...

Embodiment 3

[0026]Mix aluminum nitrate, ethanol, and deionized water at a molar ratio of 1:10:12, stir at 60°C for 40 minutes to form a clear and transparent solution, cool to room temperature to obtain aluminum sol; mix ethyl orthosilicate, deionized water, ethanol and nitric acid are mixed and uniformly stirred to obtain silica sol in a molar ratio of 1:16:8:0.1; aluminum sol, silica sol, and phenylboronic acid are respectively mixed and stirred uniformly by aluminium: silicon: boron molar ratio 1:0.8:0.2, and added ring Propylene oxide (the molar ratio of propylene oxide to aluminum is 6:1), vigorously stirred for 10 minutes, and left to stand for 2 hours, the gel was formed; the gel was supercritically dried with carbon dioxide as the medium to obtain high-temperature-resistant Al-Si-B-O ceramics airgel material. The specific surface area of ​​ceramic airgel material is 520m 2 / g, the porosity is 85%, the thermal conductivity is 0.045W / m.K, the material is calcined at 1500℃, the line...

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Abstract

The invention provides a high-temperature-resistant Al-Si-B-O ceramic airgel material, which uses a sol-gel process to uniformly disperse an aluminum precursor, a silicon precursor, and a boron precursor in a solvent, and then undergoes hydrolysis and polycondensation After the reaction, co-gel, and then synthesize a high-temperature-resistant Al-Si-B-O ceramic airgel material through a supercritical drying process. The present invention is passed in Al 2 o 3 The introduction of Si and B elements into the airgel can not only significantly delay Al 2 o 3 The sintering and phase transformation of nanoparticles can also form an aluminoborosilicate glass phase film covering the surface of the aerogel at a high temperature of 1500 ° C, effectively blocking the continuous transfer of heat from the outside of the aerogel to the inside, thereby improving the performance of the aerogel. al 2 o 3、 Al 2 o 3 ‑SiO2 2 The high-temperature thermal stability and high-temperature heat insulation performance of the base airgel can significantly increase the service temperature of the aerogel, and can be used as a high-temperature heat-insulation protective material for aerospace vehicles.

Description

technical field [0001] The invention relates to a synthesis method of a ceramic airgel material, in particular to a high-temperature-resistant Al-Si-B-O ceramic airgel material and a synthesis method thereof, which can be used in thermal protection systems of aerospace vehicles. Background technique [0002] The mesopore size (2~50nm) possessed by airgel can constrain the movement of gas molecules to a certain extent (O 2 , N 2 The flat free path of the molecule is about 70nm), which reduces the heat transfer generated by the collision of gas molecules, so the macroscopic thermal conductivity of airgel is extremely low, and it is a super thermal insulation material with excellent performance. Aerogels are mainly divided into organic aerogels and inorganic aerogels. Organic aerogels will burn and carbonize at high temperatures, so inorganic aerogels are mainly used in high-temperature environments. At present, the inorganic aerogels used as high-temperature insulation mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/515C04B35/622C04B35/624
CPCC04B35/515C04B35/622C04B35/624C04B38/0045C04B38/0074C04B2235/9607C04B2235/9615
Inventor 杨景锋陈守兵张新瑞王齐华王廷梅
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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