Dielectric Breakdown Strength and Microwave Dielectric Properties of Alumina Ceramics with CaO-SiO₂- MgO, Yb₂O₃ and ZrO₂ Additives

Abstract:

Al₂O₃ ceramics with CaO-SiO₂-MgO (CMS), Yb₂O₃ and ZrO₂ additives were fabricated by a conventional solid-state reaction method. The effects of ZrO₂ dopant on phase compositions, microwave dielectric properties and dielectric breakdown strength of Al₂O₃ ceramics were studied. XRD demonstrated that CaAl₂Si₂O₈ and Zr &Y compound phases co-existed with alumina. SEM exhibited that ZrO₂ dopant could refine the grain of alumina ceramics and improve its relative density. With ZrO₂ content increasing from 1wt% to 5wt% ε_r increased from 9.8 to 10.25, but Q×f decreased from 52823GHz to 35922GHz. The breakdown strength increased initially and reached the maximum value at ZrO₂=3wt%. When ZrO₂ content is 3wt%, the comprehensive performances were the best: E_b= 37.37kV/mm for 1mm samples and 17.26kV/mm for 3mm samples, Q×f = 37044 GHz, ε_{r =} 10.01, and τ_{f =} -52 ppm/°C.

• Periodical: Solid State Phenomena (Volume 281)
• Pages: 640-645
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.281.640
• Online since: August 2018
• Authors: Gui Fen Fan, Hao Yuan Deng, Meng Meng Hao*, Kai Wang, Yu Sheng Shi, Chen Hui Li, Wen Zhong Lu
• Keywords: Alumina, Dielectric Breakdown Strength, Microwave Dielectric Property, ZrO₂ Additive

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