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Characterization of Fe–Cr Alloys for Reduced Operation Temperature SOFCs
Author(s) -
Horita T.,
Xiong Y.,
Yamaji K.,
Sakai N.,
Yokokawa H.
Publication year - 2003
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.200290018
Subject(s) - alloy , oxide , materials science , annealing (glass) , analytical chemistry (journal) , secondary ion mass spectrometry , ion , metallurgy , chemistry , organic chemistry , chromatography
Chemical stability of ferritic (Fe–Cr) alloy interconnect material was examined under anode gas atmospheres for use in solid oxide fuel cells (SOFCs). In H 2 –H 2 O and CH 4 –H 2 O atmospheres, oxide scale layers were formed on the alloy surface. The surface morphology of the alloy was varied with forming oxide scales at 1073 K for an extended annealing time. Secondary ion mass spectrometry (SIMS) was applied to analyze the distribution of major and minor elements as a function of depth. From surface to inner alloy, the following distribution was identified: Mn, Fe rich → Cr rich → Si rich → alloy bulk and Al 2 O 3 inner oxides. The parabolic growth rate constants of oxide scales ( k p ) were calculated for each atmosphere as follows: 3.76 × 10 –6 μm 2 s –1 for H 2 –H 2 O and 5.23 × 10 –6 μm 2 s –1 for CH 4 –H 2 O. The growth rate constants were similar between these two atmospheres.