Glass-ceramic seal to join Crofer 22 APU alloy to YSZ ceramic in planar SOFCs
Smeacetto F, Salvo M, Ferraris M, Cho J, Boccaccini AR (2008)
Publication Type: Journal article
Publication year: 2008
Journal
Publisher: Elsevier
Pages Range: 61-68
Journal Issue: 28
DOI: 10.1016/j.jeurceramsoc.2007.05.006
Abstract
This work describes the design and development of a glass-ceramic seal to produce a hermetic joint between the ceramic electrolyte and the metallic interconnect of planar SOFC stacks. The glass-ceramic composition was designed considering the chemical compatibility with the ceramic electrolyte (yttria stabilized zirconia) and the oxidation resistant metal alloy interconnect (Crofer 22 APU), the thermo-mechanical properties (characteristic temperatures, thermal expansion coefficient), and the wettability on the substrates. The designed glass-ceramic seal is a barium-free silica-based glass, which partially crystallizes during the heat treatment after being deposited on Crofer 22 APU substrate by slurry coating or by electrophoretic deposition. The sealing process of the glass-ceramic was optimized, also taking into account that the maximum processing temperature should be lower that 950 °C (upper limit for the metallic interconnect) and the maximum heating rate of about 5 °C/min (limit for ceramic components). The joined ceramic/seal/metal samples were morphologically characterized and preliminary tested for 400 h in air atmosphere at the fuel cell operating temperature of 800 °C. Thermal ageing in air caused a Cr-diffusion from Crofer 22 APU alloy to the seal only when the alloy was used in the as-received condition. The preoxidised one did not diffuse Cr ions through the seal under the same ageing conditions. © 2007 Elsevier Ltd. All rights reserved.
Authors with CRIS profile
Involved external institutions
Politecnico di Torino
Italy (IT)
Imperial College London / The Imperial College of Science, Technology and Medicine
United Kingdom (GB)
Italy (IT)
Imperial College London / The Imperial College of Science, Technology and Medicine
United Kingdom (GB)
How to cite
APA:
Smeacetto, F., Salvo, M., Ferraris, M., Cho, J., & Boccaccini, A.R. (2008). Glass-ceramic seal to join Crofer 22 APU alloy to YSZ ceramic in planar SOFCs. Journal of the European Ceramic Society, 28, 61-68. https://doi.org/10.1016/j.jeurceramsoc.2007.05.006
MLA:
Smeacetto, F., et al. "Glass-ceramic seal to join Crofer 22 APU alloy to YSZ ceramic in planar SOFCs." Journal of the European Ceramic Society 28 (2008): 61-68.
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