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Glass-ceramic sealants for solid oxide fuel cells: Part I. Physical properties

Published online by Cambridge University Press:  31 January 2011

K. L. Ley ,
M. Krumpelt ,
R. Kumar ,
J. H. Meiser  and
I. Bloom
K. L. Ley
Affiliation:
Electrochemical Technology Program, Chemical Technology Division, Argonne National Laboratory, Argonne, Illinois 60439–4837
M. Krumpelt
Affiliation:
Electrochemical Technology Program, Chemical Technology Division, Argonne National Laboratory, Argonne, Illinois 60439–4837
R. Kumar
Affiliation:
Electrochemical Technology Program, Chemical Technology Division, Argonne National Laboratory, Argonne, Illinois 60439–4837
J. H. Meiser
Affiliation:
Electrochemical Technology Program, Chemical Technology Division, Argonne National Laboratory, Argonne, Illinois 60439–4837
I. Bloom*
Affiliation:
Electrochemical Technology Program, Chemical Technology Division, Argonne National Laboratory, Argonne, Illinois 60439–4837
*
c) Author to whom correspondence should be addressed.
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Abstract

A family of sealant materials has been developed for use in the solid oxide fuel cell (SOFC) and in other applications in the temperature range of 800–1000 °C. These materials are based on glasses and glass-ceramics in the SrO–La2O3–Al2O3–B2O3–SiO2 system. The coefficients of thermal expansion (CTE) for these materials are in the range of 8–13 × 10−6/°C, a good match with those of the SOFC components. These sealant materials bond well with the ceramics of the SOFC and, more importantly, form bonds that can be thermally cycled without failure. At the fuel cell operating temperature, the sealants have viscosities in the range of 104–106 Pa-s, which allow them to tolerate a CTE mismatch of about 20% among the bonded substrates. The gas tightness of a sample seal was demonstrated in a simple zirconia-based oxygen concentration cell.

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Type
Articles
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Journal of Materials Research , Volume 11 , Issue 6 , June 1996 , pp. 1489 - 1493
Copyright
Copyright © Materials Research Society 1996

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References

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