Magnetic-electric composite coating with oriented segregated structure for enhanced electromagnetic shielding  

作　　者：Jijun Zhang Zexuan Wang Jiawei Li Yaqiang Dong Aina He Guoguo Tan Qikui Man Bin Shen Junqiang Wang Weixing Xia Jun Shen Xin-min Wang 

机构地区：[1]CAS Key Laboratory of Magnetic Materials and Devices,and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China [2]Institute of Fundamental and Frontier Sciences,University of Electronic Science and Technology of China,Chengdu 610054,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]Ningbo Key Laboratory of Polymer Materials,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China [5]College of Mechatronics and Control Engineering,Shenzhen University,Shenzhen 518060,China

出　　处：《Journal of Materials Science & Technology》2022年第1期11-20,共10页材料科学技术（英文版）

基　　金：supported by National Key Research and Development Program of China(No.2016YFB0300500);National Natural Science Foundation of China(No.51771215);Ningbo Major Special Projects of the Plan“Science and Technology Innovation 2025(No.2018B10084);China Postdoctoral Science Foundation(No.2020M673174)。

摘　　要：Manipulation of the internal architecture is essential for electromagnetic interference(EMI)shielding performance of metal-based coatings,which can address the electromagnetic pollution in large-size,complex geometries,and harsh environments.In this work,oriented segregated structure with conductive networks embedded in magnetic matrix was achieved in Fe-based amorphous coatings via Ni-Cu-P functionalization of(Fe_(0.76)Si_(0.09)B_(0.1)P_(0.05))_(99)Nb_(1)amorphous powder precursors and then thermal spraying them onto aluminum(Al)substrate.Benefiting from the unique magnetic-electric structure,the coating@Al composite delivered prominent EMI shielding performance.The EMI shielding effectiveness(SE)of modified coating@Al composite is~41 dB at 8-12 GHz,doubling the value of Al substrate and is 15 dB greater than that of Ni-Cu-P-free coating@Al composite.Microstructure analysis showed that the introduced Ni−Cu−P insertions forcefully suppress the serious oxidation of the magnetic precursors during thermal spraying and form a dense conductive network in the magnetic matrix.Electron holography observation and electromagnetism simulation clarified that the modified coating can effectively trap and attenuate the incident radiations because of the electric loss from Ni−Cu−P conductive network,magnetic loss from Fe-based amorphous coating,and the electromagnetic interactions in the oriented segregated architectures.Moreover,the optimized thermal isolation and mechanical properties brought by structural improvement enable the coating to shield complex parts in thermal shock and mechanical loading environments.Our work gives an insight on the design strategies for metal-based EMI shielding materials and enriches the fundamental understanding of EMI shielding mechanisms.

关 键 词：Fe-based amorphous coatings NI-CU-P Oriented segregated structure Electromagnetic shielding 

分 类 号：TB306[一般工业技术—材料科学与工程]