Tailoring Fe-Base Alloys for Intermediate Temperature SOFC Interconnect Application, (Final).

Zhu, J. H. ; Brady, M. P. ; Anderson, H. U.

Technical Information Center Oak Ridge Tennessee

关键词: Solid oxide fuel cells;    Alloys;    Anodes;    Cathodes;    Coatings;   

RP-ID  :  DE2008932217

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

This report summarized the research efforts and major conclusions for our SECA Phase I and II project focused on Cr-free or low Cr Fe-Ni based alloy development for intermediate temperature solid oxide fuel cell (SOFC) interconnect application. Electrical conductivity measurement on bulk (Fe,Ni)(sub 3)O(sub 4) coupons indicated that this spinel phase possessed a higher electrical conductivity than Cr(sub 1.5)Mn(sub 1.5)O(sub 4) spinel and Cr(sub 2)O(sub 3), which was consistent with the low area specific resistance (ASR) of the oxide scale formed on these Fe-Ni based alloys. For Cr-free Fe-Ni binary alloys, although the increase in Ni content in the alloys improved the oxidation resistance, and the Fe-Ni binary alloys exhibited adequate CTE and oxide scale ASR, their oxidation resistance needs to be further improved. Systematic alloy design efforts have led to the identification of one low-Cr (6wt.%) Fe-Ni-Co based alloy which formed a protective, electrically-conductive Cr(sub 2)O(sub 3) inner layer underneath a Cr-free, highly conductive spinel outer layer. This low-Cr, Fe-Ni-Co alloy has demonstrated a good CTE match with other cell components; high oxidation resistance comparable to that of Crofer; low oxide scale ASR with the formation of electrically-insulating phases in the oxide scale; no scale spallation during thermal cycling; adequate compatibility with cathode materials; and comparable mechanical properties with Crofer.