Performance Evaluation of Candidate Materials For Solid Oxide Cell Interconnects
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Typ
Program
Kemiteknik 180 hp (högskoleingenjör)
Publicerad
Författare
Mitrovic, Igor
Modellbyggare
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Sammanfattning
This thesis examines the oxidation kinetics and the chromium evaporation of possible SOFC
interconnect materials at 800 °C in air with 3% water vapor. The selected materials are AISI
441, AISI 446, Nirosta (Industrial Melt 1), and Crofer 22 APU. The study shows that the
oxidation kinetics of these steels are varied, with AISI 441 and Crofer 22 APU showing
dissimilar behaviors compared to AISI 446 and Nirosta (IM 1). Among the materials, Crofer
22 APU exhibits a mass loss, indicating unique oxidation kinetics. Chromium evaporation
rates also differ, with AISI 441 showing the highest average evaporation rate and Crofer 22
APU the lowest, suggesting better protective properties of the oxide scale formed on the
surface of Crofer 22 APU. The findings highlight that Crofer 22 APU, due to its protective
oxide scale, is the most promising candidate for SOFC interconnects under the tested
conditions. Furthermore, the possibility of using Nirosta (IM 1) or AISI 446 materials as
cheaper counterparts although, they exhibit somewhat higher values of the chromium
emission rate over time in comparison with Crofer 22 APU.