| 미세구조에 따른 La0.6Sr0.4Co0.2Fe0.8O3-δ 분리막의 산소투과 및 기계적 특성 |
| 이시우, 이승영1, 이기성2, 우상국2, 김도경 |
한국과학기술원 재료공학과
1충남대학교 금속공학과
2한국에너지기술연구원 에너지재료연구팀 |
| Oxygen Permeation and Mechanical Properties of La0.6Sr0.4Co0.2Fe0.8O3-δ Membrane with Different Microstructures |
| Shi-Woo Lee, Seung-Young Lee1, Kee-Sung Lee2, Sang-Kuk Woo2, Do-Kyung Kim |
Department of Materials Science and Engineering, KAIST
1Department of Metallurgical Engineering, Chungnam National University
2Energy Materials Research Team, Korea Institute of Energy Research |
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| ABSTRACT |
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Oxygen permeability and the mechanical properties of mixed ionic-electronic conductive $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_{3-{delta}}$ perovskite-type membrane, fabricated by solid state reaction, were investigated with regard to microstructure. The microstructure of the membrane was controlled by changing the sintering temperature and holding time. The average grain size and relative density were evaluated as a function of sintering conditions. As the fraction of grain boundary decreased, oxygen permeability showed a tendency to increase. Especially the maximum oxygen flux of 0.37 ml/$cm^2$${cdot}$min was measured for the specimen sintered at 1300${circ}C$ for 10 h, which has high density and relatively large grain size. Fracture strength was dependent on the relative density of sintered body, while fracture toughness increased with average grain size. 耀 Ѐ |
| Key words:
Mixed Ionic-Electronic Conductor(MIEC), $LaSrCoFeO_3$, Perovskite, Oxygen permeable membrane |
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