Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Oxygen Permeation and Mechanical Properties of La0.6Sr0.4Co0.2Fe0.8O3-δ Membrane with Different Microstructures

미세구조에 따른 La0.6Sr0.4Co0.2Fe0.8O3-δ 분리막의 산소투과 및 기계적 특성

  • Lee, Shi-Woo (Department of Materials Science and Engineering, KAIST) ;
  • Lee, Seung-Young (Department of Metallurgical Engineering, Chungnam National University) ;
  • Lee, Kee-Sung (Energy Materials Research Team, Korea Institute of Energy Research) ;
  • Woo, Sang-Kuk (Energy Materials Research Team, Korea Institute of Energy Research) ;
  • Kim, Do-Kyung (Department of Materials Science and Engineering, KAIST)
  • 이시우 (한국과학기술원 재료공학과) ;
  • 이승영 (충남대학교 금속공학과) ;
  • 이기성 (한국에너지기술연구원 에너지재료연구팀) ;
  • 우상국 (한국에너지기술연구원 에너지재료연구팀) ;
  • 김도경 (한국과학기술원 재료공학과)
  • Published : 2002.01.01
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Abstract

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.

고상 반응법을 통해 $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_{3-{\delta}}$ 페롭스카이트계 산소투과 분리막을 제조하였으며, 미세구조에 따른 산소투과 특성 및 기계적 특성을 고찰하였다. 분리막의 미세구조는 소결온도 및 소결 유지시간을 달리함으로써 조절하였으며, 미세구조에 따른 평균 입경 및 상대밀도의 변화를 평가하였다. 입계 분율의 감소에 따라 산소투과유속이 증가하는 경향을 나타내었으며, 본 연구에서 고찰한 소결조건 중에서는 1300${\circ}C$에서 10시간 유지하여 제조한, 상대밀도가 높고 비교적 입경이 조대한 분리막 시편의 경우, 최대 0.37 ml/$cm^2$${\cdot}$min의 산소투과유속이 특정되었다. 파괴강도는 소결체의 상대밀도에 의존적이었으며, 파괴인성은 결정립의 크기에 따라 증가하는 경향을 나타내었다.

Keywords

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