Journal ArticleDOI
Dielectric and microwave-absorption properties of SiC nanoparticle/SiBCN composite ceramics
Reads0
Chats0
TLDR
SiC nanoparticles with different contents were mixed with liquid polyborosilazane and the compound was used to prepare SiC nanoparticle/polymer-derived SiBCN ceramics (SiC/PDCs-SiBCN).Abstract:
SiC nanoparticles with different contents (5–20 wt%) were mixed with liquid polyborosilazane. The compound was used to prepare SiC nanoparticle/polymer-derived SiBCN ceramics (SiC/PDCs-SiBCN). Thermal gravity tests (25–1400 °C) in air and helium atmosphere were used to investigate the thermal stability of SiC/PDCs-SiBCN. Dielectric and microwave-absorption properties of SiC/PDCs-SiBCN were determined at frequencies of 8.2–12.4 GHz by waveguide method. Results show that the addition of SiC nanoparticles increased the thermal stability of SiBCN ceramics. The permittivity, dielectric loss and absorption coefficient of ceramics increased as an elevated SiC content, resulting from the increase of carrier concentration. To understand the high-temperature dielectric property of SiC/PDCs-SiBCN, the permittivity of SiBCN ceramics with 15 wt% of SiC was measured at temperatures of 293–773 K. The composite ceramics were found to have a visible increase in the permittivity and dielectric loss, indicating their great potential as the high-temperature microwave absorption materials.read more
Citations
More filters
Journal ArticleDOI
The fate and role of in situ formed carbon in polymer-derived ceramics
TL;DR: In this paper, a review article highlights the recent progress in the polymer-derived ceramics (PDCs) field with the focus on the fate and role of the in situ formed carbon, and potential advanced structural and functional applications of the PDCs related to the carbon are evaluated.
Journal ArticleDOI
Strong and thermostable polymeric graphene/silica textile for lightweight practical microwave absorption composites
Wei-Li Song,Xiao-Tian Guan,Li-Zhen Fan,Yi-Bo Zhao,Wen-Qiang Cao,Chan-Yuan Wang,Mao-Sheng Cao +6 more
TL;DR: In this paper, a novel strategy to fabricate strong and thermostable polymeric graphene/silica textile composites for practical microwave absorption applications is proposed, where a unique silica textile coupled with freeze-drying method is employed as the critical factor in the formation of the polymeric composites.
Journal ArticleDOI
Progress in low-frequency microwave absorbing materials
TL;DR: In this paper, the authors summarized the progress obtained in conventional materials and new emerging structures for microwave absorption at low frequency, and the ultimate aim of these materials is to realize a wider effective absorption frequency bandwidth (fE) at a thinner coating thickness.
Journal ArticleDOI
Yolk–shell Fe3O4@ZrO2 prepared by a tunable polymer surfactant assisted sol–gel method for high temperature stable microwave absorption
TL;DR: In this article, a high-dispersed Fe3O4@ZrO2 yolk-shell structure with a Zirconia shell of homogeneous shell thickness was successfully prepared via a polymer surfactant assisted sol-gel method.
Journal ArticleDOI
Recent Progresses of High-Temperature Microwave-Absorbing Materials
TL;DR: In this paper, the authors propose that certain parts of aircraft and weapons, such as head cone, engine inlet and nozzle, need to be resistant to high-temperature and high-speed heat flow.
References
More filters
Book
Electronic processes in non-crystalline materials
TL;DR: The Fermi Glass and the Anderson Transition as discussed by the authorsermi glass and Anderson transition have been studied in the context of non-crystalline Semiconductors, such as tetrahedrally-bonded semiconductors.
Journal ArticleDOI
The effects of temperature and frequency on the dielectric properties, electromagnetic interference shielding and microwave-absorption of short carbon fiber/silica composites
TL;DR: In this paper, a dielectric spectroscopy of short carbon fiber/silica composite in the frequency range from 8.2 to 12.4 GHz at temperatures between 30 and 600°C has been performed.
Journal ArticleDOI
Polymer-Derived Ceramics: 40 Years of Research and Innovation in Advanced Ceramics
TL;DR: In this paper, the authors highlight the following scientific issues related to advanced polymer-derived ceramics research: (1) General synthesis procedures to produce silicon-based preceramic polymers.
Journal ArticleDOI
Design, preparation and properties of non-oxide CMCs for application in engines and nuclear reactors: an overview
TL;DR: SiC-based ceramic matrix composites, consisting of carbon or SiC fibers embedded in a SiC-matrix, are tough ceramics when the fiber/matrix bonding is properly optimized through the use of a thin interphase.
Book
Dielectrics and Waves
TL;DR: Macroscopic approach complex permittivity and permaebility polarization and magnetization couloumb and dipole fields space-charge fields correlations between electric and magnetic phenomena Maxwell's field equations electromagnetic waves in unbounded space descriptions of dielectrics by various sets of parameters forces field energy and radiation polarized radiation dipole radiation boundary conditions Fresnel's equations reflection and refraction of plane waves by loss-free dielectric standing waves interference optics skin effect as discussed by the authors.