Preparation and Properties of Si₃N₄-BaTiO₃ Composite Ceramics

Abstract:

Si₃N₄-BaTiO₃ composite ceramics, a type of high dielectric materials applied in the multifunction radome, were prepared by gas pressure-sintering method. The influences of BaTiO₃ power content on the mechanical performances, dielectric properties and microstructure of Si₃N₄-BaTiO₃ composite ceramics were investigated. The results showed that the sintering density, the elastic modulus and the flexural strength of Si₃N₄-BaTiO₃ composite ceramics all firstly increased and then decreased along with the increase of BaTiO₃ power in sample. Meanwhile, Relationship between BaTiO₃ power content and dielectric properties of Si₃N₄-BaTiO₃ composite ceramics within the frequency range of 8.2–12.4 GHz (X-band) was studied. The average of dielectric constant e of Si₃N₄-BaTiO₃ composite ceramics increased from 7.33 to 9.98 and the average of dielectric loss tand increased from 2.8 ´ 10^-3 to 0.0168 when the content of BaTiO₃ power increased from 0 to 25 wt.%. The increase of the dielectric properties of Si₃N₄–BaTiO₃ composite ceramics were attributed to the electronic and molecular polarization at interface between Si₃N₄ and BaTiO₃, compared with the pure matrix Si₃N₄.

• Periodical: Solid State Phenomena (Volume 281)
• Pages: 646-651
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.281.646
• Online since: August 2018
• Authors: Ping Ping Zhang*, Jing Man, Hong Sheng Wang, Qi Hong Wei, Ying Gai, Bao Xin Zhu, Ling Li
• Keywords: Barium Titanate, Dielectric Property, Silicon Nitride, X-Band

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