Characterization of Fe–Cr Alloys for Reduced Operation Temperature SOFCs
Characterization of Fe–Cr Alloys for Reduced Operation Temperature SOFCs
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DOI：
10.1002/fuce.200290018
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发表时间：
2002-12
期刊：
影响因子：
2.8
通讯作者：
T. Horita;Y. Xiong;K. Yamaji;N. Sakai;H. Yokokawa
中科院分区：
文献类型：
--
作者：
T. Horita;Y. Xiong;K. Yamaji;N. Sakai;H. Yokokawa
研究了用于固体氧化物燃料电池（SOFC）的铁素体（Fe-Cr）合金连接体材料在阳极气氛下的化学稳定性。在H_2-H_2O和CH_4-H_2O气氛中，合金表面形成氧化膜层。在1073 K下延长退火时间，合金的表面形貌随着氧化皮的形成而变化。二次离子质谱（西姆斯）被用来分析作为深度的函数的主要和次要元素的分布。从表面到内部的分布为：富Mn、Fe →富Cr →富Si →合金块体和Al 2 O3内部氧化物。计算了不同气氛下氧化膜的抛物线生长速率常数kp：H_2-H_2O为3.76 × 10 ~（-6）μ m_2s ~（-1），CH_4-H_2O为5.23 × 10 ~（-6）μ m_2s ~（-1）。这两种气氛之间的生长速率常数是相似的。
Chemical stability of ferritic (Fe–Cr) alloy interconnect material was examined under anode gas atmospheres for use in solid oxide fuel cells (SOFCs). In H2–H2O and CH4–H2O 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 Al2O3 inner oxides. The parabolic growth rate constants of oxide scales (kp) were calculated for each atmosphere as follows: 3.76 × 10–6 μm2s–1 for H2–H2O and 5.23 × 10–6 μm2s–1 for CH4–H2O. The growth rate constants were similar between these two atmospheres.