Ceramic-based electromagnetic wave absorbing materials and concepts towards lightweight, flexibility and thermal resistance

Abstract

Electromagnetic wave (EMW) absorbing materials have attracted much attention in recent years due to the dramatical increase of high-frequency electronic components and devices, which generate electromagnetic (EM) pollution and cause serious electromagnetic interference (EMI). Ceramics and associated (nano)composites are widely investigated as EMW absorbing materials because of their excellent mechanical properties, chemical/ thermal stabilities, and oxidation/corrosion resistance. In addition to outstanding EMW absorbing performance, lightweight, flexibility and thermal resistance at high temperatures strongly affect their practical applications. Therefore, this review highlights the recent progress of advanced ceramic-based EMW absorbing materials by evaluating their vital EMW absorption parameters. First, the fundamentals of EMW absorption are briefly summarized, followed by the effects of phase/chemical composition, micro/nano structure, and morphology on the EMW absorbing performance and associated mechanisms. Furthermore, modern strategies for the preparation of lightweight, flexible and thermal resistant EMW absorbing materials are comprehensively reviewed. Finally, the perspectives of advancedceramics as EMW absorbing materials are discussed as well.

High-Performance Microwave Absorption Materials: Theory, Fabrication, and Functionalization

“…However, the comprehensive absorption performances of pure silicon-based ceramics are not very good. Therefore, in order to significantly enhance the comprehensive absorption performance of silicon-based ceramic MAMs, some unique strategies have been proposed, including the nanometer procession, structure optimization, and complex engineering . This section aims to give a detailed summarization of the state-of-the-art advances of designing silicon-based ceramics MAMs, where their microwave absorption properties are compared accordingly (Table ).…”

Structural Electromagnetic Absorber Based on MoS2/PyC‐Al2O3 Ceramic Metamaterials

“…[ 29,30 ] Finally, limited by the resonant effect, traditional ceramic‐based monolithic EMAMs materials always exhibit strong frequency‐dependent absorption properties, leading to narrow EAB (<< 10 GHz), which seriously limits their engineering application. [ 16,18,19 ]…”

“…Ceramic-based EMAMs are typically prepared by the incorporation or in situ formation of absorbents in EM wave transparent ceramic matrices (e.g., Si-based and Al 2 O 3 ceramics). [16][17][18][19] The most widely used absorbents include SiC nanowires, magnetic materials (e.g., oxides and/or metals of Fe, Co, and Ni), carbon materials (e.g., graphitic carbon, carbon nanotubes (CNTs), and graphene) and transition metal carbides (TMCs; e.g., TiC). [16][17][18][19][20][21] As a semiconductor, SiC inherently possesses poor conductive loss, [21] and magnetic materials are always limited by the Curie point.…”

“…[16][17][18][19] The most widely used absorbents include SiC nanowires, magnetic materials (e.g., oxides and/or metals of Fe, Co, and Ni), carbon materials (e.g., graphitic carbon, carbon nanotubes (CNTs), and graphene) and transition metal carbides (TMCs; e.g., TiC). [16][17][18][19][20][21] As a semiconductor, SiC inherently possesses poor conductive loss, [21] and magnetic materials are always limited by the Curie point. [22] Graphitic carbon materials and TMCs possess strong conductive loss; [23][24][25][26][27][28] however, their high intrinsic electrical conductivity (σ) also leads to strong reflection.…”

“…[29,30] Finally, limited by the resonant effect, traditional ceramic-based monolithic EMAMs materials always exhibit strong frequency-dependent absorption properties, leading to narrow EAB (<< 10 GHz), which seriously limits their engineering application. [16,18,19] Metamaterials are a class of materials that can exhibit exotic electromagnetic performance effects impossible to achieve with common materials, and realize unity absorptivity of EM waves in an ultra-broad frequency bandwidth by rationally designing and realizing their meta-structures with dielectric materials loaded with a lossy phase. [29,[31][32][33] The advent of electromagnetic absorption metamaterials provides new opportunities for the developing of advanced ceramic-based EMAMs.…”