One-step synthesis and electromagnetic absorption properties of high entropy rare earth hexaborides (HE REB6) and high entropy rare earth hexaborides/borates (HE REB6/HE REBO3) composite powders

被引:119
作者
Zhang, Weiming [1 ]
Zhao, Biao [2 ]
Xiang, Huimin [1 ]
Dai, Fu-Zhi [1 ]
Wu, Shijiang [3 ]
Zhou, Yanchun [1 ]
机构
[1] Aerosp Res Inst Mat & Proc Technol, Sci & Technol Adv Funct Composite Lab, Beijing 100076, Peoples R China
[2] Zhengzhou Univ Aeronaut, Sch Mat Sci & Engn, Henan Key Lab Aeronaut Mat & Applicat Technol, Zhengzhou 450046, Peoples R China
[3] Zibo Firststar New Mat Inc Co Ltd, Zibo 255000, Peoples R China
基金
中国国家自然科学基金;
关键词
high entropy rare earth hexaborides (HE REB6); one-step synthesis; electromagnetic wave absorbing properties; synergistic dielectric and magnetic losses; wide effective absorption bandwidth; MICROWAVE ABSORBING PROPERTIES; INTERFERENCE SHIELDING EFFECTIVENESS; LOW THERMAL-CONDUCTIVITY; MAGNETIC-PROPERTIES; WAVE ABSORPTION; HYDROTHERMAL SYNTHESIS; METAL BORIDES; ENERGY-BANDS; BROAD-BAND; PERFORMANCE;
D O I
10.1007/s40145-020-0417-2
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Considering the emergence of severe electromagnetic interference problems, it is vital to develop electromagnetic (EM) wave absorbing materials with high dielectric, magnetic loss and optimized impedance matching. However, realizing the synergistic dielectric and magnetic losses in a single phase material is still a challenge. Herein, high entropy (HE) rare earth hexaborides (REB6) powders with coupling of dielectric and magnetic losses were designed and successfully synthesized through a facial one-step boron carbide reduction method, and the effects of high entropy borates intermedia phases on the EM wave absorption properties were investigated. Five HE REB(6)ceramics including (Ce0.2Y0.2Sm0.2Er0.2Yb0.2)B-6, (Ce0.2Eu0.2Sm0.2Er0.2Yb0.2)B-6, (Ce0.2Y0.2Eu0.2Er0.2Yb0.2)B-6, (Ce0.2Y0.2Sm0.2Eu0.2Yb0.2)B-6, and (Nd0.2Y0.2Sm0.2Eu0.2Yb0.2)B(6)possess CsCl-type cubic crystal structure, and their theoretical densities range from 4.84 to 5.25 g/cm(3). (Ce0.2Y0.2Sm0.2Er0.2Yb0.2)B(6)powders with the average particle size of 1.86 mu m were found to possess the best EM wave absorption properties among these hexaborides. TheRL(min)value of (Ce0.2Y0.2Sm0.2Er0.2Yb0.2)B(6)reaches -33.4 dB at 11.5 GHz at thickness of 2 mm; meanwhile, the optimized effective absorption bandwidth (E-AB) is 3.9 GHz from 13.6 to 17.5 GHz with a thickness of 1.5 mm. The introduction of HE REBO3(RE = Ce, Y, Sm, Eu, Er, Yb) as intermediate phase will give rise to the mismatching impedance, which will further lead to the reduction of reflection loss. Intriguingly, the HEREB6/HEREBO(3)still possess wide effective absorption bandwidth of 4.1 GHz with the relative low thickness of 1.7 mm. Considering the better stability, low density, and good EM wave absorption properties, HE REB(6)ceramics are promising as a new type of EM wave absorbing materials.
引用
收藏
页码:62 / 77
页数:16
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