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Multi-band composite electromagnetic wave absorbing material and preparation method and application thereof

A technology for absorbing materials and electromagnetic waves, applied in the field of nanomaterials, can solve problems such as radar wave absorption and stealth that cannot be applied to high-temperature components, and achieve the effects of easy mass production, environmental friendliness, and good repeatability

Active Publication Date: 2022-05-10
HARBIN INST OF TECH AT WEIHAI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the combination of carbon materials and magnetic materials is one of the effective ways to obtain high-performance absorbing materials, but this method has disadvantages
At high temperature, the magnetic absorber will lose its magnetism so that it cannot be applied to the radar absorbing stealth of high temperature components

Method used

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  • Multi-band composite electromagnetic wave absorbing material and preparation method and application thereof
  • Multi-band composite electromagnetic wave absorbing material and preparation method and application thereof
  • Multi-band composite electromagnetic wave absorbing material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]Step 1, the SnCl of 0.8mol (0.1-1mol is equivalent to 0.8mol technical effect) 2 2H 2 O was dissolved in a mixed solution of 10 mL of absolute ethanol and 5 mL of deionized water, and stirred for 30 min; 4 mL of tetraethyl orthosilicate (TEOS) was added to the above mixed solution to form a Sn / Si composite gel; sealed and aged for 2 days and dried Finally, soak in NaOH solution (2mol / L) and stir for 15min, wash and filter, and dry at 60°C for 24h; then grind, calcinate at 550°C, the heating rate is 10°C / min, and the holding time is 4h to obtain porous SnO 2 ;

[0041] Step 2, take 10mmol porous SnO 2 Nanoparticles are mixed with 0.1g of aluminum powder and calcined at 500°C for 3 hours to reduce the aluminum powder and generate a certain concentration of oxygen vacancies to obtain tin dioxide (D-SnO2) containing oxygen vacancies. 2 ). as attached image 3 As shown in the X-ray photoelectron spectrum, there are three obvious peaks at 530.28eV, 531.50eV and 532.28eV a...

Embodiment 2

[0047] Same as Example 1, the only difference is that in step 3, the mass ratio GO:D-SnO 2 =20:1.

[0048] The D-SnO that this embodiment makes 2 SEM images of / rGO composites figure 1 (b), shown by figure 1 (b) It can be seen that D-SnO 2 Distributed on the rGO matrix, the diameter is small, forming a loose and porous structure.

[0049] The D-SnO that this embodiment makes 2 The schematic diagram of the absorbing performance of the / rGO composite material in the frequency range of 2-18GHz is as follows figure 2 (b), shown by figure 2 (b) It can be seen that the prepared D-SnO 2 The lowest reflection loss RL value of the / rGO composite material is -35.65dB (8.15GHz), and the effective absorption bandwidth is 13.02GHz; and with the change of the thickness of the composite material, the best absorption peak appears in different frequency bands, that is, it satisfies multi-frequency absorb.

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Abstract

The invention discloses a multi-band composite electromagnetic wave absorbing material as well as a preparation method and application thereof, and relates to the technical field of nano materials. The raw materials of the multi-band composite electromagnetic wave absorbing material comprise tin dioxide containing oxygen vacancies and reduced graphene oxide. The mass ratio of the reduced graphene oxide to the tin dioxide containing the oxygen vacancies is (20-30): 1. According to the invention, SnO2 nano spherical particles containing rich oxygen vacancies are adopted to improve impedance matching of the composite electromagnetic wave absorbing material, and rich interfaces (oxygen vacancy defects) are introduced to improve conductivity loss and polarization loss of the composite electromagnetic wave absorbing material. The preparation process is good in repeatability, low in cost, environment-friendly, clean, non-toxic and easy for large-scale production.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a multi-band composite electromagnetic wave absorbing material and its preparation method and application. Background technique [0002] With the rapid development of modern electromagnetic wave communication technology, electromagnetic radiation pollution in the environment has become a problem that cannot be ignored. It can not only interfere with the normal operation of electronic and electrical equipment, but also pose a great threat to human health. Therefore, electromagnetic wave absorbing materials have attracted more and more attention of scientists. At the same time, the rapid development of modern electronic countermeasure technology makes various weapons (such as missiles, aircraft, tanks, ships, etc.) in future wars face a huge threat. Therefore, in order to continuously improve the ability of weapons' battlefield survival, defense penetration and deep st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/02C01B32/184H05K9/00C09K3/00
CPCC01G19/02C01B32/184H05K9/0083C09K3/00C01P2004/03C01P2004/64C01P2002/72
Inventor 夏龙黄小萧李天天安煜葛孔禹钟博姜大海
Owner HARBIN INST OF TECH AT WEIHAI
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