Korean Chemical Engineering Research

  • 제48권2호
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  • Pages.172-177
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  • 2010
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  • 0304-128X(pISSN)
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  • 2233-9558(eISSN)
한국화학공학회 (The Korean Institute of Chemical Engineers)
권호 표지

LSC가 코팅된 고체산화물 연료전지용 금속연결재의 특성 연구

Characteristics of LSC coated Metallic Interconnect for Solid Oxide Fuel Cell

  • 표성수 (한국에너지기술연구원 연료전지연구단) ;
  • 이승복 (한국에너지기술연구원 연료전지연구단) ;
  • 임탁형 (한국에너지기술연구원 연료전지연구단) ;
  • 박석주 (한국에너지기술연구원 연료전지연구단) ;
  • 송락현 (한국에너지기술연구원 연료전지연구단) ;
  • 신동열 (한국에너지기술연구원 연료전지연구단)
  • Pyo, Seong-Soo (Fuel Cell Research Center, New and Renewable Energy Research Division, Korea Institute of Energy Research) ;
  • Lee, Seung-Bok (Fuel Cell Research Center, New and Renewable Energy Research Division, Korea Institute of Energy Research) ;
  • Lim, Tak-Hyoung (Fuel Cell Research Center, New and Renewable Energy Research Division, Korea Institute of Energy Research) ;
  • Park, Seok-Joo (Fuel Cell Research Center, New and Renewable Energy Research Division, Korea Institute of Energy Research) ;
  • Song, Rak-Hyun (Fuel Cell Research Center, New and Renewable Energy Research Division, Korea Institute of Energy Research) ;
  • Shin, Dong-Ryul (Fuel Cell Research Center, New and Renewable Energy Research Division, Korea Institute of Energy Research)
  • 투고 : 2009.11.09
  • 심사 : 2009.11.28
  • 발행 : 2010.04.30
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⟨ 이전 논문 다음 논문 ⟩

초록

본 논문에서는 SOFC 금속연결재로서 Crofer22APU를 적용하고자 표면에 전도성 산화막($La_{0.8}Sr_{0.2}CoO_3$)을 습식코팅 후, SOFC 작동환경에서 산화거동, 전기적 특성변화 및 미세구조 변화를 관찰하였다. 코팅 전 샌드블러스트 장치를 이용한 Crofer22APU 표면처리를 통하여 코팅막/금속의 접합특성을 개선시킬 수 있었으며, 320 mesh의 입자크기를 갖는 알루미나 분말을 이용하여 표면처리한 경우 접착특성이 극대화되었다.$La_{0.8}Sr_{0.2}CoO_3$ 코팅된 시편의 전기적 특성 평가는 4-wire 법을 이용하여 SOFC 작동환경에서 약 4,000 시간 장기성능 평가하였으며 $12mW{\cdot}cm^2$의 낮은 면저항값을 얻을 수 있었다. 실험종료 후 미세구조 분석결과에서도 전도성 산화막($La_{0.8}Sr_{0.2}CoO_3$) 코팅이 금속의 부식으로 인한 산화층의 생성속도를 늦추고 이로 인한 금속의 전기적 특성이 감소하는 것을 방지하는데 유효함을 확인하였다.

This study reports the high-temperature oxidation kinetics, ASR(area specific resistance), and interfacial microstructure of metallic interconnects coated with conductive oxides in oxidation atmosphere at $800^{\circ}C$, The conductive material LSC($La_{0.8}Sr_{0.2}CoO_3$, prepared by Solid State Reaction) was coated on the Crofer22APU. The contact behavior of coating layer/metal substrate was increased by sandblast. The electrical conductivity of the LSC coated Crpfer22APU was measured by a DC two probe four wire method for 4000hr, in air at $800^{\circ}C$. Microstructure and composition of the coated layer interface were investigated by SEM/EDS. These results show that a coated LSC layer prevents the formation and growth of oxide scale such as $Cr_2O_3$ and enhances the long-term stability and electrical performance of metallic interconnects for SOFCs.

키워드

참고문헌

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