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J. Korean Ceram. Soc. > Volume 37(7); 2000 > Article
Journal of the Korean Ceramic Society 2000;37(7): 705.
콜로이드 계면화학을 이용한 저온형 고체전해질용 $CeO_2$계 복합 산화물의 소결체 제조
황용신, 최성철
한양대학교 세라믹공학과
The Preparation for Sintered Body of $CeO_2$ Based Complex Oxide in Low Temperature Solid Oxide Fuel Cells Using Colloidal Surface Chemistry
ABSTRACT
In this study, the dispersion stability of CeO2 based complex oxide was studied, and density, porosity, and microstructure of green body were investigated using colloid surface chemistry to manufacture the Gd2O3 doped CeO2 solid electrolyte in an aqueous system. To prepare the stable slurry for slip casting, the dispersion stability was examined as a function of pH using ESA(electrokinetic sonic anplitude) analysis. The dynamic mobility of particles was enhanced with anionic and cationic dispersant were added the amount of 0.5wt% respectively, but pH value in slurries didn't move to below 6.0 because of the influence of dopants. This phenomenon also appeared in the CeO2-Y2O3 and CeO2-Sm2O3 systems, so it could be inferred that rare earth dopants such as Gd2O3, Sm2O3 and Y2O3 not only have the similar motion with changing pH in an aqueous system but also can be dissolved in the range of pH 6.0∼6.5. In CeO2-Gd2O3 system, when the anionic dispersant was added the amount of 0.5wt% and pH value in slurries was fixed at 9.5, the green body density was 4.07g/㎤, and the relative density of sintered body was 95.2%. It could be inferred from XRD analysis that Gd3+ substituted into Ce4+ site because there was no free Gd2O3 peak.
Key words: SOFC, $CeO_2$electrolyte, ESA, Dynamic mobility
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