期刊
JOURNAL OF POWER SOURCES
卷 172, 期 2, 页码 775-781出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2007.05.022
关键词
solid oxide fuel cell; interconnect alloy; oxidation resistance; spinel; Cr volatility; area specific resistance
A new low thermal expansion, low-Cr, Fe-Co-Ni base alloy was developed and evaluated as interconnect for intermediate-temperature solid oxide fuel cells (SOFCs). This alloy demonstrated good oxidation resistance, low oxide scale area specific resistance and a reasonable match in coefficient of thermal expansion with adjacent cell components. A double-layer oxide structure with an highly conductive, Cr-free (Fe,Co,Ni)(3)O-4 spinel outer layer and a thin protective Cr2O3 inner layer was formed on the alloy surface upon thermal exposure in air at 800 degrees C. The existence of the Cr-free (Fe,Co,Ni)304 outer layer effectively reduced the Cr evaporation and in transpiration testing resulted in a six-fold decrease in Cr evaporation as compared to a state-of-the-art ferritic interconnect alloy. The new low-Cr alloy also exhibited good scale spallation resistance and adequate compatibility with the cathode material La0.8Sr0.2MnO3 (LSM). (c) 2007 Elsevier B.V. All rights reserved.
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