Enhancement of Vickers hardness and Electrical Conductivity in 3YSZ-8YSZ Oxide System with Al₂O₃ Addition
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Abstract
Solid oxide fuel cells (SOFC), primarily composed of oxide materials, operate at temperatures ranging from 600 to 1000°C. Yttria-stabilized zirconia (YSZ) has high oxide ion conductivity at 900℃, making it a promising material for SOFC electrolytes and anode electrodes. In this study, Al2O3 was added to 3YSZ-8YSZ oxides, and the electrical conductivity and Vickers hardness were evaluated. Recommended values for the amounts of 3YSZ, 8YSZ, Al2O3, and sintering temperature were obtained by machine learning. The recommended value determined from the electrical conductivity, Vickers hardness, and sintering temperature of C0(50.0wt% 3Y-50.0wt% 8Y-0wt% Al₂O₃), C05(49.7wt% 3Y-49.7wt% 8Y-0.50wt% Al₂O₃), and C1(49.5wt% 3Y-49.5wt% 8Y-1.0wt% Al₂O₃), and other related samples. The recommended composition was determined to be R1 (48.8wt% 3Y-50.8wt% 8Y-0.35wt% Al₂O₃), and the sintering temperature was 1410°C. The crystal structure of R1 was cubic structure indexed as ICDD PDF # 00-030-1468. The electrical conductivity of R1 was observed to be more than 1000 times higher than that of sample C0 without alumina added.
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This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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