Performance and testing of glass-ceramic sealant used to join anode-supported-electrolyte to Crofer22APU in planar solid oxide fuel cells |
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| Authors: | F. Smeacetto A. Chrysanthou M. Salvo Z. Zhang M. Ferraris |
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| Affiliation: | aDepartment of Materials Science and Chemical Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;bSchool of Aerospace, Automotive and Design Engineering, University of Hertfordshire, College Lane, Hatfield, Herts AL10 9AB, UK |
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| Abstract: | This work describes the performance and testing of a glass-ceramic sealant used to join the ceramic electrolyte (anode-supported-electrolyte (ASE)) to the metallic interconnect (Crofer22APU) in planar SOFC stacks. The designed glass-ceramic sealant is a barium and boron free silica-based glass, which crystallizes by means of the heat-treatment after being deposited on substrates by the slurry technique.Joined ASE/glass-ceramic seal/Crofer22APU samples were tested for 500 h in H2–3H2O atmosphere at the fuel cell operating temperature of 800 °C.Moreover, the joined ASE/glass-ceramic seal/Crofer22APU samples were submitted to three thermal cycles each of 120 h duration, in order to evaluate the thermomechanical stability of the sealant.The microstructures and elemental distribution at Crofer22APU/glass-ceramic and ASE/glass-ceramic interfaces were investigated.SEM micrograph observations of joined samples that underwent cyclic thermal tests and exposure for 500 h in H2–3H2O atmosphere showed that the adhesion between the glass-ceramic and Crofer22APU at either interface was very good and no microstructural changes were detected at the interfacial boundaries.The study showed that the use of the glass-ceramic was successful in preventing strong adverse corrosion effects at the Crofer22APU/glass-ceramic sealant interface. |
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| Keywords: | Glass-ceramic Fuel cell Sealant Hydrogen Crofer22APU |
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