abstract
A bi-layered concept of glass-ceramic (GC) sealant is proposed to overcome the challenges being faced by solid oxide fuel cells' (SOFCs). Two separated layers composed of glasses (Gd-0.3 and Sr-0.3) were prepared and deposited onto interconnect materials using a tape casting approach. After heat treating the bi-layered structure at 850 degrees C for 1-100 h, smooth and void free interfaces over the entire cross-section of joint were obtained. Micro-Raman analysis confirmed the presence of a higher amount of residual glassy phase in Gd-0.3 in comparison to Sr-0.3. The bi-layered GC showed good wetting and bonding ability to the Crofer22APU metallic plate. Slight increase of electrical conductivity with increasing annealing time was observed due to partial crystallization of the glass, but the overall conductivity levels of GC bi-layers were low enough to grant good electrical insulation. This set of relevant properties makes the investigated bi-layered sealants suitable for SOFC applications. (C) 2013 Elsevier Ltd. All rights reserved.
keywords
DIOPSIDE
subject category
Materials Science
authors
Reddy, AA; Eghtesadi, N; Tulyaganov, DU; Pascual, MJ; Santos, LF; Rajesh, S; Marques, FMB; Ferreira, JMF
our authors
Allu Amarnath Reddy
PhD Student
Fernando Manuel Bico Marques
Full professor
José Maria da Fonte Ferreira
Retired Professor
Rajesh Surendran Nair
Post-doc FellowshipGroups
G3 - Electrochemical Materials, Interfaces and Coatings
G5 - Biomimetic, Biological and Living Materials
acknowledgements
This study was financially supported by the JECS trust (Contract 201242-2), University of Aveiro, CICECO, and FCT, Portugal (SFRH/BD/89915/2012 and PTDC/CTM-CER/114209/2009).