a kind of sio 2 @c Nanocomposite material and its preparation method

A nano-composite material and nano-composite technology are applied in the field of energy material preparation, which can solve the problems of poor toughness and low aerogel strength, and achieve the effects of improving strength and toughness, simple preparation method and strong controllability.

Active Publication Date: 2021-01-12
NORTH CHINA INST OF AEROSPACE ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the traditional SiO 2 The technical problem of low airgel strength and poor toughness, the invention provides a SiO 2 @C nanocomposite material and its preparation method, uniform carbon-coated SiO synthesized by this method 2 Nanoscale particles have a rich pore structure, the particle size of the material is within 100nm, and the pore size is concentrated below 20nm. Its microstructure is conducive to reducing the solid heat conduction and convective heat conduction of the material. It is a potential thermal insulation material

Method used

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  • a kind of sio <sub>2</sub> @c Nanocomposite material and its preparation method
  • a kind of sio <sub>2</sub> @c Nanocomposite material and its preparation method
  • a kind of sio <sub>2</sub> @c Nanocomposite material and its preparation method

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Embodiment 1

[0031] First disperse or dissolve ethyl orthosilicate in ethanol and hydrochloric acid, mix and fully stir at room temperature for more than half an hour. Subsequently, the solution was reacted at 60° C. for 2 hours. After that, 3ml of ammonia water was added dropwise to the solution, and after stirring at room temperature for half an hour, it was sealed and transferred to a dry environment (relative humidity less than 60%) for aging for about 10 days. The resulting SiO 2 The airgel product was dried and ground into powder, and 200 mg was placed in a quartz tube for chemical vapor deposition. Heating to 690°C in an argon atmosphere; then passing through acetylene gas, and reacting at this temperature for 1 hour to obtain SiO 2 @C core-shell nanostructure thermal insulation material.

[0032] SiO obtained by this method 2 SEM characterization of @C nanocomposites as figure 1 shown. N of the material 2 The isotherm adsorption-desorption curve is as figure 2 shown. The ...

Embodiment 2

[0034] First disperse or dissolve ethyl orthosilicate in ethanol and hydrochloric acid, mix and fully stir at room temperature for more than half an hour. Subsequently, the solution was reacted at 60° C. for 2 hours. After that, 3ml of ammonia water was added dropwise to the solution, and after stirring at room temperature for half an hour, it was sealed and transferred to a dry environment (relative humidity less than 60%) for aging for about 10 days. The resulting SiO 2 The airgel product was dried and ground into powder, and 200 mg was placed in a quartz tube for chemical vapor deposition. Heating to 890°C in an argon atmosphere; then, pass through acetylene gas and react at this temperature for 1 hour to obtain SiO 2 @C core-shell nanostructure thermal insulation material.

[0035] SiO obtained by this method 2 SEM characterization of @C nanocomposites as Figure 4 shown. N of the material 2 The isotherm adsorption-desorption curve is as Figure 5 shown. The pore ...

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Abstract

The invention discloses a carbon-coated silica (SiO2@C) nano composite material and a preparation method thereof, and belongs to the field of preparation of energy materials. According to the method, SiO2 aerogel powder and acetylene gas are adopted as raw materials, and a carbon layer is coated on the surface of the SiO2 aerogel by using a chemical vapor deposition method so as to form the SiO2@C nano composite material. The preparation method is simple, and the thickness of the carbon layer and the size of a pore size can be adjusted controllably, and high reproducibility is achieved; the prepared SiO2@C nano composite material has a rich pore structure, the particle diameter of the material is within 100 nm, and the pore size is focused at 20 nm or below; and the microstructure of the material is beneficial to reduction of solid heat conduction and convection heat conduction of the material, and the composite material has high strength and high toughness, and is a potential thermal insulation material.

Description

technical field [0001] The present invention relates to a SiO 2 The @C nanocomposite material and its preparation method belong to the technical field of energy material preparation. Background technique [0002] Since high-efficiency thermal insulation materials can reduce the loss of heat energy in the process of generation, transportation, storage and use, thereby improving energy utilization, it is considered to be an important way to save energy and reduce economic losses. In recent decades, especially after the energy crisis in the 1870s, thermal insulation materials and their technologies have been paid more and more attention. Whether it is in aerospace, construction, industrial pipelines, low-temperature storage and transportation, or metallurgy, energy storage, thermal batteries, thermal protective clothing and other fields, it has been widely used. [0003] At present, there are many kinds of thermal insulation materials, which can be mainly divided into three c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12C01B32/05B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C01B33/12C01P2004/03C01P2004/64C01P2006/16C01P2006/17C01P2006/32C01B32/05
Inventor 李晖王瑞杰米涛李鑫刘巧宾
Owner NORTH CHINA INST OF AEROSPACE ENG
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