Influences of Eu2O3 Doping Amount and Sintering Temperature on Properties of Al2O3-based Microwave Ceramic Materials
Jing-rui KANG, Gui-xia DONG(), Yi-nan LYU, Lei LI, Wei-dan HAN, Xi ZHANG
Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials, College of Materials Science and Engineering, North China University of Science and Technology, Tangshan 063210, Hebei, China
A kind of alumina ceramic was prepared by atmospheric pressure sintering under air atmosphere using MgO-CuO-TiO2-Eu2O3 as sintering additive. The effect of Eu2O3 doping amount and sintering temperature on the phase composition, microstructure as well as dielectric properties of Al2O3-based microwave ceramic samples was studied by XRD, SEM and EDS. The results show that the Al2Eu2O9 secondary crystalline phase is present in all Al2O3 ceramics with Eu2O3 addition, and the Al2Eu2O9 phase is enhanced with the increase of Eu2O3 content. With higher Eu2O3 content, the density of Al2O3 ceramics increases first and then decreases. As sintering temperature increases, the dielectric constant and quality factor Q·f of Al2O3 ceramics increase first and then decrease. When the sintering temperature rises up to 1450℃ and the content of Eu2O3 is 0.25%(mass fraction), the relative density of the sintered body reaches to the maximum of 98.21%, and the dielectric properties of the Al2O3 ceramics are superior with the dielectric constant 10.05 and the quality factor Q·f 37984GHz.
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