(Si0.2Ti0.2Nb0.2Ta0.2V0.2)C高熵陶瓷的低温制备及吸波性能

doi:10.11896/cldb.22050232

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Abstract Seeking electromagnetic shielding materials with good physical properties is one of the hot spots in electromagnetic wave absorption. High entropy ceramics have the advantages of high temperature thermal stability and good oxidation resistance, but the high synthesis temperature and lack of research on wave-absorbing properties limit their development in the field of high-temperature wave absorption. In this work, polycrystalline rock salt type (Si_0.2Ti_0.2Nb_0.2Ta_0.2V_0.2)C high entropy carbide ceramics were synthesized by molten salt method, and their phase composition, microscopic morphology and wave absorption properties were investigated. The results show that the diffraction peak of the sample shar-pened gradually with the increase of the reaction temperature and the absorption performance improved significantly. When the reaction temperature is 1 500 ℃, the lowest reflection loss reaches -34.68 dB at 3.72 GHz. Compared with the reported high-entropy carbide ceramics, the coa-ting thickness is reduced by 13.3% (1.5 mm to 1.3 mm) for the same effective absorption bandwidth (2.3 GHz), and the dielectric loss mainly comes from polarization loss and conductivity loss. The high-entropy carbide ceramics prepared in this paper can provide a new avenue for research on the preparation of new environmentally adapted, high-temperature resistant and shock-resistant high-performance single-phase absor-bing materials.

Key words： high-entropy carbide ceramic microwave absorbing material microwave absorbing performance dielectric loss molten salt method

Published: 10 February 2024 Online: 2024-02-19

CLC number:

TB332

Fund:National Natural Science Foundation of China General Project (51578448, 52272089),National Natural Science Youth Fund Project (51308447, 52202113), Shaanxi Province Outstanding Youth Science Foundation (2021JC-43), China Postdoctoral Fund (2021M702550), Scientific Research Program Funded by Shaanxi Provincial Education Department (20JY042,19JK0463).

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	ZHANG Hao
	HUANG Zongyue
	ZHANG Yanbin
	WEI Jian

Cite this article:

ZHANG Hao,HUANG Zongyue,ZHANG Yanbin, et al. Low-temperature Preparation and Microwave Absorbing Properties of (Si_0.2Ti_0.2Nb_0.2Ta_0.2V_0.2)C High-entropy Ceramic[J]. Materials Reports, 2024, 38(3): 22050232-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22050232 OR http://www.mater-rep.com/EN/Y2024/V38/I3/22050232

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