Microwave Dielectric Properties of 0.9Al2O3-0.1TiO2Ceramics Prepared by Aqueous Gelcasting

doi:10.3724/SP.J.1077.2010.10365

Abstract

Abstract: Theaqueous gelcasting was used to prepare 0.9Al₂O₃-0.1TiO₂ceramics. The microstructures, phase compositions and microwave dielectricproperties of sintered 0.9Al₂O₃-0.1TiO₂ceramics were investigated. With the help of proper calcination temperature(1200℃)and continuous and slow cooling process as annealing treatment, the Al₂TiO₅secondary phase was successfully eliminated. Compared with conventional drypressing method, bigger grains, less pores and more uniform microstructures areobserved in the 0.9Al₂O₃-0.1TiO₂ ceramicsprepared by aqueous gelcasting. Therefore, much better microwave dielectricproperties are obtained in the ceramics prepared by aqueous gelcasting with e_r= 10.71, Q x f = 20421GHz, t_f= 1.3 x 10^-⁶/℃, whereas that of ceramics preparedby dry pressing are e_r = 10.89, Q x f = 11938GHz, t_f= 1.4 x 10^-⁶/℃.

Key words: ceramics, dielectricproperties, microstructures, 0.9Al₂O₃-0.1TiO₂, aqueousgelcasting

WU Jia-Min, LÜ Wen-Zhong, LIANG Jun, WANG Xiao-Hong. Microwave Dielectric Properties of 0.9Al₂O₃-0.1TiO₂Ceramics Prepared by Aqueous Gelcasting[J]. Journal of Inorganic Materials, 2011, 26(1): 102-106.

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Microwave Dielectric Properties of 0.9Al₂O₃-0.1TiO₂Ceramics Prepared by Aqueous Gelcasting

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