Preparation and Properties of Si₃N₄-SiC Radar Wave-Absorbing Nanocomposites

Abstract:

The vacuum-sintering technology was adopted to prepared Si₃N₄-SiC composite ceramic, a type of Radar Wave-Absorbing materials (RAW). The mechanical performances of the composite materials were tested and the influences of SiC powers on the mechanics performances and microstructure of Si₃N₄ ceramics were investigated. The results show that the sintering density, the content of size ofβ-Si₃N₄ and the strength of Si₃N₄-SiC all decrease along with the increase of SiC powers in sample, compared with the pure matrix Si₃N₄ .Meanwhile, Relationship between SiC content and relative permittivity of Si₃N₄-SiC within the frequency range of 8.2–12.4 GHz (X-band) was studied. The average of relative permittivityεof Si₃N₄-SiC increased from 7.878 to 13.88 and the average of dielectric loss tanδincreased from 5.6×10^-3 to 0.7869 when the content of SiC increased from 0 to 15 wt.%. The excellent microwave absorbing abilities of Si₃N₄–SiC ceramic were attributed to the interfacial polarization at interface between Si₃N₄ and SiC and at grain boundary between SiC nanocrystals.

• Periodical: Key Engineering Materials (Volume 697)
• Pages: 462-466
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.697.462
• Online since: July 2016
• Authors: Ping Ping Zhang*, Hong Sheng Wang, Ling Li, Lai Lv, Qing Li Zhang
• Keywords: Dielectric Properties, Silicon Carbide, Silicon Nitride, X-Band

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