Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Mechanical and Electrical Properties of $\textrm{La}_{0.68}\textrm{Ca}_{0.32}\textrm{Cr}_{0.97}\textrm{O}_{3}$ for SOFC Applications

SOFC용 $\textrm{La}_{0.68}\textrm{Ca}_{0.32}\textrm{Cr}_{0.97}\textrm{O}_{3}$의 기계적 및 전기적 특성

  • Lee, Yu-Gi (Dept. of Metallurgical Engineering, Hanyang University) ;
  • Park, Jong-Wan (Dept. of Metallurgical Engineering, Hanyang University)
  • Published : 1997.03.01
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Abstract

$La_{0.68}Ca_{0.32}Cr_{0.97}O_{3}$ interconnector films ior pimar rypn solid oxide fuel (,ells were prepared under various sinteririg conditions and their bending strength. relative ilerisit~. m t l c:lec ~ ~ - i i ; i l condl~cti\.lt\ were niexiureti in order to study their mechanical and electrical propertics Th' Irndirig sriength of $La_{0.68}Ca_{0.32}Cr_{0.97}O_{3}$ lt the room temperature \vas increased with increasing sinrering temperature dnfl tinic. The relative densit\- of more than 94% was ohtained 1)). sintering at $1400^{\circ}C$ for 5hrs. The present irlvestigiition rovcals thcit sirileririg of $La_{0.68}Ca_{0.32}Cr_{0.97}O_{3}$ at lorn. temperature xyvas greatly assisted by formation oi Ca,,,(CrO,),, Also the i,leitriczl conductivity at $1000^{\circ}C$ \vas more than 100S; cm d t e r heating at $1400^{\circ}C$ for 7hrs.

평판형 고체산화물 연료전지용 연결재료로 사용되는 $La_{0.68}Ca_{0.32}Cr_{0.97}O_{3}$박막의 소결조건을 변화시키며 곡강도, 상대밀도 및 전기전도도를 측정하였다. 그 결과 $La_{0.68}Ca_{0.32}Cr_{0.97}O_{3}$의 곡강도는 소결온도와 소결시간이 증가할수록 증가하였고, 상대밀도는 $1400^{\circ}C$, 5시간이상 소결한 시편에서 94%이상을 얻었다. $La_{0.68}Ca_{0.32}Cr_{0.97}O_{3}$의 저온소결은 $Ca_{m}(C_{r}O_{4})_{n}$에 의해 이루어졌음이 관찰되었다. 또한 $La_{0.68}Ca_{0.32}Cr_{0.97}O_{3}$의 전기전도도는 $1400^{\circ}C$, 7시간 소결한 시편의 경우 $1000^{\circ}C$에서 약 100/cm이상을 얻었다.

Keywords

References

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