材料科学技术(英文版)2021，Vol.77Issue(18) ：58-65.

(Cr0.2Mn0.2Fe0.2Co0.2Mo0.2)B:A novel high-entropy monoboride with good electromagnetic interference shielding performance in K-band

Haiming Zhang Biao Zhao Fu-Zhi Dai Huimin Xiang Zhili Zhang Yanchun Zhou
材料科学技术(英文版)2021，Vol.77Issue(18) ：58-65.
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(Cr0.2Mn0.2Fe0.2Co0.2Mo0.2)B:A novel high-entropy monoboride with good electromagnetic interference shielding performance in K-band

Haiming Zhang 1Biao Zhao 2Fu-Zhi Dai 3Huimin Xiang 3Zhili Zhang 4Yanchun Zhou3
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作者信息

  • 1. Science and Technology on Advanced Functional Composite Laboratory,Aerospace Research Institute of Materials&Processing Technology,No.1 South Dahongmen Road,Beijing,100076,China;School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing,100044,China
  • 2. Henan Key Laboratory of Aeronautical Materials and Application Technology,School of Material Science and Engineering,Zhengzhou University of Aeronautics,Zhengzhou,450046,China
  • 3. Science and Technology on Advanced Functional Composite Laboratory,Aerospace Research Institute of Materials&Processing Technology,No.1 South Dahongmen Road,Beijing,100076,China
  • 4. School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing,100044,China
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Abstract

A novel equimolar high-entropy(HE)transition metal monoboride,(Cr0.2Mn0.2Fe0.2Co0.2Mo0.2)B,was designed and prepared in powder and bulk form by high temperature elemental reac-tion method and spark plasma sintering(SPS)method,respectively.XRD analysis shows that HE(Cr0.2Mn0.2Fe0.2Co0.2Mo0.2)B possesses orthorhombic structure with Pnma space group.Through Rietveld refinement,the lattice parameters of HE(Cr0.2Mn0.2Fe0.2Co0.2Mo0.2)B are a=5.6675,b=2.9714,c=4.2209 and the theoretical density is 6.95 g/cm3.The Vickers hardness and electrical conductivity of HE(Cr0.2Mn0.2Fe0.2Co0.2Mo0.2)B bulk with relative density of 90％is 12.3±0.5 GPa and 0.49±0.04×106 S/m,respectively.Due to high electrical conductivity,HE(Cr0.2Mn0.2Fe0.2Co0.2Mo0.2)B bulk with 3.0 mm thickness displays superior EMI shielding performance in 18.0-26.5 GHz(K-band),and the average values of SET,SER,and SEA are 23.3 dB,13.9 dB,and 9.4 dB,respectively.The EMI shielding mechanism of HE(Cr0.2Mn0.2Fe0.2Co0.2Mo0.2)B mainly results from reflection.

Key words

High-entropy ceramics/Transition metal monoboride/Electromagnetic interference(EMI)shielding/Mechanical properties/Electrical conductive ceramics

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基金项目

出版年

2021
材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI
影响因子：0.657
ISSN：1005-0302
被引量5
参考文献量65
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