| Issue |
Korean Chemical Engineering Research,
Vol.48, No.2, 172-177, 2010
Vol.48, No.2, 172-177, 2010
LSC가 코팅된 고체산화물 연료전지용 금속연결재의 특성 연구
Characteristics of LSC coated Metallic Interconnect for Solid Oxide Fuel Cell
본 논문에서는 SOFC 금속연결재로서 Crofer22APU를 적용하고자 표면에 전도성 산화막 (La0.8Sr0.2CoO3)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. La0.8Sr0.2CoO3 코팅된 시편의 전기적 특성 평가는 4-wire 법을 이용하여 SOFC 작동환경에서 약 4,000 시간 장기성능 평가하였으며 12 mW·cm2의 낮은 면저항값을 얻을 수 있었다. 실험종료 후 미세구조 분석결과에서도 전도성 산화막(La0.8Sr0.2CoO3) 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 ℃. The conductive material LSC(La0.8Sr0.2CoO3, 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 ℃. 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 Cr2O3 and enhances the long-term stability and electrical performance of metallic interconnects for SOFCs.
[References]
- Lashtabeg A, Skinner SJ, J. Mater. Chem., 16, 3161, 2006
- Yakabe H, Hishinuma M, Uratani M, Matsuzaki Y, Yasuda I, J. Power Sources, 86(1-2), 423, 2000
- Zhu WZ, Deevi SC, Mat. Sci. and Eng., A348, 227, 2003
- Schafer W, Koch A, Herold-Schmidt U, Stolten D, Solid State Ionics, 1235, 1996
- Koch S, Hendriksen PV, Solid State Ion., 168(1-2), 1, 2004
- Zhu WZ, Deevi SC, Mat. Res. Bull, 38, 957, 2003
- Kim JH, Song RH, Hyun SH, Solid State Ion., 174(1-4), 185, 2004
- Yang Z, Xia G, Stevenson JW, Electrochem. Solid-State Lett., 8, 168, 2005
- Yang Z, Xia GG, Maupin GD, Stevenson JW, Surf. Coat. Technol., 201, 4476, 2006
- Stoermer AO, Rupp JLM, Gauckler LJ, Solid State Ion., 177(19-25), 2075, 2006
- Zhu WZ, Deevi SC, Mat. Res. Bull, 38, 957, 2003
- Chen X, Hou PY, Jacobson CP, Visco SJ, De Jonghe LC, Solid State Ion., 176(5-6), 425, 2005
- Kim HM, Hyun SH, Kim HS, Inter. J. Hydro Energy, 33, 1758, 2008
- Yang Z, Weil KS, Paxton DM, Stevenson JW, J. Electrochem. Soc., 150, 1188, 2003
- Ebnesajjad and Sina, “Surface Treatment of Materials for Adhesion Bonding,” William Andrew Publishing, 2006
- Pawlowski L, “The Science and Engineering of Thermal Spray Coatings,” John Wiley & Sons Ltd., 1995
- Snogren RC, “Handbook on Surface Preparation,” Palmerton publishing, 1974
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