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

被引：36

作者：

Zhang, Haiming ^{[1
,2
]}

Zhao, Biao ^{[3
]}

Dai, Fu-Zhi ^{[1
]}

Xiang, Huimin ^{[1
]}

Zhang, Zhili ^{[2
]}

Zhou, Yanchun ^{[1
]}

机构：

[1] Aerosp Res Inst Mat & Proc Technol, Sci & Technol Adv Funct Composite Lab, 1 South Dahongmen Rd, Beijing 100076, Peoples R China

[2] Beijing Jiaotong Univ, Sch Mech Elect & Control Engn, Beijing 100044, Peoples R China

[3] Zhengzhou Univ Aeronaut, Sch Mat Sci & Engn, Henan Key Lab Aeronaut Mat & Applicat Technol, Zhengzhou 450046, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2021年 / 77卷

基金：

中国国家自然科学基金;

关键词：

High-entropy ceramics; Transition metal monoboride; Electromagnetic interference (EMI) shielding; Mechanical properties; Electrical conductive ceramics; IRON BORIDE; COMPOSITE-MATERIALS; CERAMICS; FILMS; DIBORIDES; CR2ALB2; GROWTH;

D O I：

10.1016/j.jmst.2020.09.047

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 reaction 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/cm(3). 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 x 10(6) 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. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

引用

页码：58 / 65

页数：8

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