Chromium evaporation and oxidation characteristics of alumina-forming austenitic stainless steels for balance of plant applications in solid oxide fuel cells |
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| Authors: | Lingfeng Zhou Zhipeng Zeng Michael P Brady Donovan N Leonard Harry M Meyer Yukinori Yamamoto Wenyuan Li Greg Collins Xingbo Liu |
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| Affiliation: | 1. Mechanical & Aerospace Engineering Department, West Virginia University, WV 26505, USA;2. Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA |
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| Abstract: | The chromium (Cr) evaporation behavior of several different types of iron (Fe)-based AFA alloys and benchmark Cr2O3-forming Fe-based 310 and Ni-based 625 alloys was investigated for 500 h exposures at 800 °C to 900 °C in air with 10% H2O. The Cr evaporation rates from alumina-forming austenitic (AFA) alloys were ~5 to 35 times lower than that of the Cr2O3-forming alloys depending on alloy and temperature. The Cr evaporation behavior was correlated with extensive characterization of the chemistry and microstructure of the oxide scales, which also revealed a degree of quartz tube Si contamination during the test. Long-term oxidation kinetics were also assessed at 800 to 1000 °C for up to 10,000 h in air with 10% H2O to provide further guidance for SOFC BOP component alloy selection. |
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| Keywords: | Chromium evaporation Alumina scale Oxidation kinetics Solid oxide fuel cell |
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