Abstract
Porous YSZ ceramics are fabricated using 3 mol% yittria-stabilized zirconia (3YSZ) and NiO with different particlesizes (0.6 and 7 μm). Nickel oxide (NiO) is added to the YSZ powder as a pore former with different amounts(40, 50, and 60 vol%) and at different sintering temperatures (1350 and 1400℃) are applied in order to evaluate the temperature effects on the pore and mechanical properties. Heat treatment is conducted after sintering at 700℃ in H₂ for the NiO reduction process; then, Ni is removed using a HNO₃ etchant solution. According to the NiO contentand sintering temperatures, 41-67% porous YSZ ceramic is obtained and the flexural strength increases, while the porosity decreases with an increasing sintering temperature. The optimum flexural strength (136.5 ± 13.4MPa) and porosity (47%) for oxygen transport porous YSZ membrane can be obtained with 40 vol% of 7 μm NiO particle at a sintering temperature of 1350℃.
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