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Novel silver/mica multilayer compressive seals for solid-oxide fuel cells: The effect of thermal cycling and material degradation on leak behavior

Published online by Cambridge University Press:  31 January 2011

Yeong-Shyung Chou  and
Jeffry W. Stevenson
Yeong-Shyung Chou*
Affiliation:
Pacific Northwest National Laboratories, Materials Resource Division, P.O. Box 999, K2-44, Richland, Washington 99352
Jeffry W. Stevenson
Affiliation:
Pacific Northwest National Laboratories, Materials Resource Division, P.O. Box 999, K2-44, Richland, Washington 99352
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

A novel Ag/mica compressive seal was thermally cycled between 100 °C and 800 °C in air to evaluate its stability. The novel Ag/mica compressive seal was composed of a naturally cleaved Muscovite mica sheet and two thin silver layers, and was reported in a previous study to have very low leak rates at 800 °C. In the present study, we examined the thermal cycle stability of the Ag/mica-based compressive seals pressed between mating couples with large and small mismatch in thermal expansion. For comparison, thermal cycling also was conducted on plain mica as well as plain silver only. In addition, the results were compared with published data of a similar mica seal using glass instead of Ag as the interlayers. For mating materials of large mismatch in thermal expansion coefficient (CTE; Inconel/alumina), the Ag/mica seal showed lower leak rates than the plain mica. For mating materials of small mismatch in CTE (SS430/alumina), the leak rates were similar for both the Ag/mica and the plain mica seal. Scanning electron microscopy was used to characterize the microstructure of the mica after thermal cycling. Microcracks, fragmentation, and wear-particle formation were observed on the mica and were correlated to the leak behavior. Overall, the novel Ag/mica seals present good thermal cycle stability for solid-oxide fuel cells, although the leak rates were greater than the corresponding mica seals with glass interlayers.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 9 , September 2003 , pp. 2243 - 2250
Copyright
Copyright © Materials Research Society 2003

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References

REFERENCES

1.Minh, N.Q., J. Am. Ceram. Soc. 76, 563 (1993).Google Scholar
2.Singhal, S.C., in Solid Oxide Fuel Cells (SOFC VI), Proceedings of the Sixth International Symposium, edited by Singhal, S.C. and Dokiya, M. (The Electrochemical Society, Pennington, NJ, 1999), Vol. 99–19, p. 39.Google Scholar
3.Bolden, R., Foger, K., and Pham, T., in Solid Oxide Fuel Cells (SOFC VI), Proceedings of the Sixth International Symposium, edited by Singhal, S.C. and Dokiya, M. (The Electrochemical Society, Pennington, NJ, 1999), Vol. 99–19, p. 80.Google Scholar
4.Norrick, D., Barringer, E., Kantak, M., Sanders, D., and Watson, G., in 2002 Fuel Cell Seminar, Palm Springs, CA, edited by Williams, M. and Milliken, J. (U.S. Department of Energy, 2002), pp. 960–963.Google Scholar
5.Lahl, N., Singheiser, L., Hilpert, K., Singh, K., and Bahadur, D., in Solid Oxide Fuel Cells (SOFC VI), Proceedings of the Sixth International Symposium, edited by Singhal, S.C. and Dokiya, M. (The Electrochemical Society, Pennington, NJ, 1999), Vol. 99–19, p. 1057.Google Scholar
6.Yamamoto, T., Itoh, H., Mori, M., Mori, N., and Watanabe, T., Denki Kagaku oyobi Kogyo Butsuri Kagaku 64, 575 (1996).Google Scholar
7.Ley, K., Krumpelt, M., Meiser, J., and Bloom, I., J. Mater. Res. 11, 1489 (1996).CrossRefGoogle Scholar
8.Larsen, P., Bagger, C., Morgensen, M., and Larsen, J., in Solid Oxide Fuel Cells-IV edited by Dokiya, M., Yamamoto, O., Tagawa, H., and Singhal, S. (The Electrochemical Society, Pennington, NJ, 1995), PV 95–1, Vol. 69, pp. 69–78.Google Scholar
9.Yang, Z.G., Weil, K.S., Paxton, D.M., and Stevenson, J.W., in 2002 Fuel Cell Seminar, Palm Springs, CA, edited by Williamsand, M.Milliken, J. (U.S. Department of Energy, 2002), pp. 522–525.Google Scholar
10.Kim, J. and Virkar, A., in Solid Oxide Fuel Cells (SOFC VI), Proceedings of the Sixth International Symposium, edited by Singhal, S.C. and Dokiya, M. (The Electrochemical Society, Pennington, NJ, 1999), Vol. 99–19, p. 830.Google Scholar
11.Simner, S.P. and Stevenson, J.W., J. Power Sources 102, 310 (2001).CrossRefGoogle Scholar
12.Chou, Y-S., Stevenson, J.W., and Chick, L.A., J. Power Sources 112, 130 (2002).CrossRefGoogle Scholar
13.Chou, Y-S. and Stevenson, J.W., J. Power Sources 112, 376 (2002).Google Scholar
14.Lahl, N., Bahadur, D., Singh, K., Singheiser, L., and Hilpert, K., J. Electrochem. Soc. 149, A607 (2002).Google Scholar
15.Oishi, N., Brandon, N.P., Rudkin, R., Steele, B.C.H., Lewis, G., and McColm, T., in 2002 Fuel Cell Seminar, Palm Springs, CA, edited by Williams, M. and Milliken, J. (U.S. Department of Energy, 2002), pp. 878–881.Google Scholar