Wide-Band Tunable Microwave-Absorbing Ceramic Composites Made of Polymer-Derived SiOC Ceramic and in Situ Partially Surface-Oxidized Ultra-High-Temperature Ceramics

被引：81

作者：

Jia, Yujun ^{[1
]}

Chowdhury, Md Atiqur Rahman ^{[1
]}

Zhang, Dajie ^{[2
,3
]}

Xu, Chengying ^{[1
]}

机构：

[1] North Carolina State Univ, Dept Mech & Aerosp Engn, Raleigh, NC 27695 USA

[2] Johns Hopkins Univ, Dept Mat Sci & Engn, 3400 North Charles St, Baltimore, MD 21218 USA

[3] Johns Hopkins Appl Phys Lab, Res & Exploratory Dev Dept, 11100 Johns Hopkins Rd, Laurel, MD 20723 USA

来源：

ACS APPLIED MATERIALS & INTERFACES | 2019年 / 11卷 / 49期

基金：

美国国家科学基金会;

关键词：

microwave-absorbing materials; interfacial polarization; multifunctional ceramic composites; ultra-high-temperature ceramics (UHTCs); polymer-derived ceramics (PDCs); INTERFERENCE SHIELDING PROPERTIES; ABSORPTION PROPERTIES; ELECTROMAGNETIC ABSORPTION; ELECTRICAL-CONDUCTIVITY; CARBON NANOTUBES; OXIDATION; BEHAVIOR; MICROSTRUCTURE; PERMEABILITY; COATINGS;

D O I：

10.1021/acsami.9b16475

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Microwave-absorbing materials in a high-temperature harsh environment are highly desired for electronics and aerospace applications. This study reports a novel high-temperature microwave-absorbing ceramic composites made of polymer-derived SiOC ceramic and in situ partially surface-oxidized ultra-high-temperature ceramic (UHTC) ZrB2 nanoparticles. The fabricated composites with a normalized weight fraction of ZrB2 nanoparticles at 40% has a significantly wide microwave absorption bandwidth of 13.5 GHz (26.5-40 GHz) covering the entire K-a-band. This is attributed to the extensive nanointerfaces introduced in the composites, attenuation induced by the interference of electromagnetic wave, attenuation from the formed current loops, and the electronic conduction loss provided by the partially surface-oxidized ZrB2 nanoparticles. The minimum reflection coefficient (RC) was -29.30 dB at 29.47 GHz for a thickness of 1.26 mm for the composites with a normalized weight fraction of ZrB2 nanoparticles at 32.5%. The direct current (dc) conductivity of the nanocomposites showed a clear percolation phenomenon as the normalized weight fraction of ZrB2 nanoparticles increases to 30.49%. The results provide new insights in designing microwave-absorbing materials with a wide absorption frequency range and strong absorption loss for high-temperature harsh environment applications.

引用

页码：45862 / 45874

页数：13

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