| 옥살산 공침법에 의한 Gd-Doped CeO2 분말의 합성 및 소결 특성 |
| 한인동, 임광영, 심수만 |
| 홍익대학교 재료공학부 |
| Preparation and Sintering Characteristics of Gd-Doped CeO2 Powder by Oxalate Co-Precipitation |
| In-Dong Han, Kwang-Young Lim, Soo-Man Sim |
| School of Materials Science and Engineering, Hongik University |
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| ABSTRACT |
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GDC20($Ce_{0.8}Gd_{0.2}O_{1.9}$) powder was synthesized by oxalate co-precipitation and milling and its thermal decomposition, phase formation, and sinterability were investigated. As-prepared precipitates were non-crystalline due to the milling process and completely decomposed at 400$^{circ}C$ The powder calcined at 800$^{circ}C$ for 2 h contained fine p]sty particles with an average size of 0.69 $mu$m. Attrition milling of the calcined powder for 2 h had a little milling effect, resulting in a slight decrease in the particle size to 0.45 $mu$m. The milled powder consisted of small spherical primary particles and some large particles, which had been agglomerated during calcination. Due to the excellent sinterability of the powder, sintering of the powder compacts for 4 h showed relative densities of 78.7% at 1000$^{circ}C$ and 97.8% at 1300$^{circ}C$, respectively. Densification was found to almost complete at temperature above 1200$^{circ}C$ and a dense and homogeneous microstructure was obtained. A rapid grain growth occurred between 1200$^{circ}C$ and 1300$^{circ}C$. Grains in 0.1$sim$0.5 $mu$m sizes at 1200$^{circ}C$ grew to 0.2$sim$2 $mu$m and their size distribution became broader at 1300$^{circ}C$. |
| Key words:
SOFC, GDC, Co-precipitation, Oxalate, Sinterability |
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