Journal of Materials Science

, Volume 42, Issue 8, pp 2643–2651

Chemical interaction between Crofer 22 APU and mica-based gaskets under simulated SOFC conditions

Article

Abstract

Mica gaskets and also composite gaskets containing compressive mica interlayers are under consideration as sealing materials in solid oxide fuel cells (SOFC). To study potential interactions between the interconnect steel Crofer22APU and the mineral phases vermiculite (exfoliated) (K,Mg,Fe)3(Si,Al)4O10(OH)2) and talc (Mg3Si4O10(OH)2), corrosion experiments were conducted in simulated SOFC conditions. The opposite walls of the gaskets were simultaneously exposed to air and wet H2. A substantial increase in the thickness of the oxide layers formed by the interconnect steel is observed with specimen containing talc. The Cr2O3/(Cr,Mn)3O4 duplex layer normally formed on the Crofer is replaced by a thicker (factor of 5–10) layer of a complex microstructure that is assumed to contain Cr2O3, (Cr,Mn,Mg,Fe)3O4 and Fe2O3 phases. The modified microstructure is found in the entire air manifold, with an increased thickness up to a distance of 300 μm from the mica. It is proposed that magnesium is the critical component responsible for the accelerated oxide formation. A decomposition of talc is observed, which is discussed as the mechanism for the release of magnesium.

References

  1. 1.
    Fergus JW (2005) J Power Sour 147:46CrossRefGoogle Scholar
  2. 2.
    Ley KL, Krumpelt M, Kumar R, Meiser JH, Bloom I (1996) J Mater Res 11:1489Google Scholar
  3. 3.
    Ohara S, Mukai K, Fukui T, Sakaki Y (2001) J Ceram Soc Jap 109:186Google Scholar
  4. 4.
    Lahl N, Singheiser L, Hilpert K, Singh K, Baradur D (1999) In: Electrochemical society proceedings, vol 99, p 1057Google Scholar
  5. 5.
    Chou Y-S, Stevenson JW, Chick LA (2003) J Am Ceram Soc 86:1003CrossRefGoogle Scholar
  6. 6.
    Bram M, Reckers S, Drinovac P, Moench J, Steinbrech RW, Buchkremer HP, Stoever D (2003) Proc Electrochem Soc. 2003–2007 (SOFC VIII) 888Google Scholar
  7. 7.
    Bram M, Reckers S, Drinovac P, Moench J, Steinbrech RW, Buchkremer HP, Stoever D (2004) J Power Sour 138:111CrossRefGoogle Scholar
  8. 8.
    Chou Y-S, Stevenson JW (2005) J Power Sour 140:340CrossRefGoogle Scholar
  9. 9.
    Wiener F, Behr W, Bram M, Buchkremer HP, Steinbrech RW (2005) Poster presentation, 9th Grove Fuel Cell Symposium, London, UKGoogle Scholar
  10. 10.
    Weiß R, Peck D, Mille M, Hilpert K (1996) Proceedings of the 17th Risø International Symposium on Materials Science, Roskilde, Denmark, 1996, 479Google Scholar
  11. 11.
    Matzsuzaki Y, Yasuda I (2001) J Electrochem Soc 148:A126–A131CrossRefGoogle Scholar
  12. 12.
    Haanappel VAC, Vinke IC, Wesermeyer H (2004) In: Proceedings of the 6th European SOFC Forum, Lucerne, Switzerland, 2004, 784Google Scholar
  13. 13.
    Huczkowski P, Shemet V, Piron-Abellan J, Singheiser L, Quadakkers WJ, Christiansen N (2004) Mater Corros 55:825CrossRefGoogle Scholar
  14. 14.
    Speidel DH, Muan A (1963) J Am Ceram Soc 46:577CrossRefGoogle Scholar
  15. 15.
    ACersS-NIST Phase Equilibria Diagrams, CD-ROM Database, Version 3.0.1Google Scholar
  16. 16.
    Bose K, Ganguly J (1995) Earth Planet Sci Lett 136:109CrossRefGoogle Scholar
  17. 17.
    Fumagalli P, Stixrude L, Poli S, Snyder D (2001) Earth Planet Sci Lett 186:125CrossRefGoogle Scholar
  18. 18.
    Wesolowsk M (1984) Thermochimica Acta 78:395CrossRefGoogle Scholar
  19. 19.
    MacKenzie KJD, Meinold RH (1994) Thermochimica Acta 244:195CrossRefGoogle Scholar
  20. 20.
    Shannon RD (1976) Acta Crystallogr A32:751Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • F. Wiener
    • 1
  • M. Bram
    • 1
  • H.-P. Buchkremer
    • 1
  • D. Sebold
    • 1
  1. 1.Institute for Materials and Processes in Energy Systems, IWVForschungszentrum Jülich GmbHJülichGermany

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