A Ba‐free sealing glass with a high coefficient of thermal expansion and excellent interface stability optimized for SOFC/SOEC stack applications

A new glass‐ceramic composition containing Si, Mg, Ca, Na, Al, Zr, and B is presented here as sealant for planar SOFCs/SOECs, with the aim of joining the metallic interconnect (Crofer22APU) to the solid oxide cell (YSZ electrolyte or CGO barrier layer). Characteristic temperature, thermo‐mechanical...

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Bibliographic Details
Published in:International journal of applied ceramic technology 2018-07, Vol.15 (4), p.1011-1022
Main Authors: Ritucci, Ilaria, Agersted, Karsten, Zielke, Philipp, Wulff, Anders Christian, Khajavi, Peyman, Smeacetto, Federico, Sabato, Antonio Gianfranco, Kiebach, Ragnar
Format: Article
Language:English
Subjects:
Aluminum oxide
Barrier layers
Ceramic coatings
Ceramics
Cerium gadolinium oxides
Crystallization
Design optimization
Devitrification
Gas tightness
Glass
glass‐ceramics
Heat treatment
Interface stability
Mechanical properties
Nepheline
Porosity
Sealing
Silicon
solid oxide fuel cell
synthesis
thermal analysis
Thermal expansion
Tightness
Yttria-stabilized zirconia
Zirconium
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Summary:A new glass‐ceramic composition containing Si, Mg, Ca, Na, Al, Zr, and B is presented here as sealant for planar SOFCs/SOECs, with the aim of joining the metallic interconnect (Crofer22APU) to the solid oxide cell (YSZ electrolyte or CGO barrier layer). Characteristic temperature, thermo‐mechanical properties, and compositional variations are reviewed and discussed by thermal analyses and in situ XRD, in order to design and optimize the sealing profile and reduce the residual porosity. The glass after heat treatment partially devitrifies into augite and nepheline with residual glass phase of around 64.3%; after crystallization the glass‐ceramic sealant has a coefficient of thermal expansion of 12.8 × 10−6 K−1 and it is compliant with the other materials typically used for stack components. This work shows that the developed glass‐ceramic can successfully join the ceramic cell with the Crofer22APU (preoxidized and alumina coating), proven by tests on small and large‐scale samples. No signs of unwanted reactions at the glass‐metal and the glass‐cell interface are observed and sufficient gas tightness is achieved.
ISSN:1546-542X
1744-7402
DOI:10.1111/ijac.12853