The microstructure of SiCN ceramics and their excellent electromagnetic wave absorbing properties
Source abstract
Abstract
Abstract In order to increase the controllability of the deposition process of SiCN ceramics, SiCN ceramics were introduced into porous Si 3 N 4 substrates by low pressure chemical vapor infiltration (LPCVI) using a simpler gaseous mixture of SiCl 3 CH 3 /NH 3 /H 2 to substitute the gaseous mixture of SiCl 4 /C 3 H 6 /NH 3 /H 2 . The as-prepared SiCN ceramics attained the microstructure of nano-sized graphite crystals distributing in amorphous SiCN phase. The SiCN ceramics with this unique microstructure had suitable relative complex permittivity, leading to excellent electromagnetic (EM) wave absorbing performance. The minimum reflection coefficient of SiCN–Si 3 N 4 ceramics was −40 dB (>99.99% absorption) at 11.1 GHz with the thickness of 3 mm. When the thickness was 3.25 mm, reflection coefficient of SiCN–Si 3 N 4 ceramics was lower than −10 dB (>90% absorption) at the whole X-band.
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Research context
OpenAlex topics: Electromagnetic wave absorption materials · Advanced Antenna and Metasurface Technologies · Microwave Dielectric Ceramics Synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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