Synthesis and EMW absorbing properties of nano SiC modified PDC–SiOC
- 16 May 2016
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry C
- Vol. 4 (25), 5962-5969
- https://doi.org/10.1039/c6tc01142j
Abstract
Nano SiC modified silicon oxycarbide (n-SiC/SiOC) ceramics were prepared through the pyrolysis of a mixture of liquid polysiloxane and n-SiC with an average grain diameter of 30 nm. After adding n-SiC, palingenetic SiC nanograins with an average grain diameter smaller than 10 nm, and nanosized free carbon were gradually separated from the amorphous SiOC phase when the annealing temperature increased from 1100 °C to 1450 °C. The various interfaces among n-SiC, in situ formed SiC nanograins, nanosized carbon and amorphous SiOC phases can obtain interfacial scattering. Eventually, the electric dipole polarization and interfacial scattering enhanced the absorption properties. The minimal reflection coefficient (RCmin) of the n-SiC/SiOC ceramics annealed at 1400 °C (n-SiC/SiOC-1400) reached −61 dB at 8.6 GHz. The widest effective absorption bandwidth (EAB) reached 3.5 GHz in the X-band, which indicates that the n-SiC/SiOC ceramics can be considered as high-performance microwave absorbing materials because of the strong absorption capability and wide absorption bandwidth.Keywords
Funding Information
- National Natural Science Foundation of China (51302206, 51521061)
This publication has 47 references indexed in Scilit:
- Dielectric and EMW absorbing properties of PDCs-SiBCN annealed at different temperaturesJournal of the European Ceramic Society, 2013
- Polymer/carbon based composites as electromagnetic interference (EMI) shielding materialsMaterials Science and Engineering: R: Reports, 2013
- Dielectric properties of SiC fiber-reinforced SiC matrix composites in the temperature range from 25 to 700°C at frequencies between 8.2 and 18GHzJournal of Nuclear Materials, 2013
- Electromagnetic Wave Absorption Properties of ZnO-Based Materials Modified with ZnAl2O4 NanograinsThe Journal of Physical Chemistry C, 2013
- A review and analysis of microwave absorption in polymer composites filled with carbonaceous particlesJournal of Applied Physics, 2012
- Multifunctional hybrids for electromagnetic absorptionActa Materialia, 2011
- Effect of Multiwall Carbon Nanotubes on Electrical and Dielectric Properties of Yttria‐Stabilized Zirconia CeramicJournal of the American Ceramic Society, 2006
- Electrical Characterization of Polymethylsiloxane/MoSi2‐Derived Composite CeramicsJournal of the American Ceramic Society, 2001
- Interpretation of Raman spectra of disordered and amorphous carbonPhysical Review B, 2000
- Modeling Density Contributions in Preceramic Polymer/Ceramic Powder SystemsJournal of the American Ceramic Society, 1986