30. Combined Ageing and Thermal Cycling of Compressive MICA Seals for Solid Oxide Fuel Cells

  1. Narottam P. Bansal
  1. Yeong-Shyung Chou,
  2. Jeffry W. Stevenson and
  3. Prabhakar Singh

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291245.ch30

Advances in Solid Oxide Fuel Cells: Ceramic Engineering and Science Proceedings, Volume 26, Number 4

Advances in Solid Oxide Fuel Cells: Ceramic Engineering and Science Proceedings, Volume 26, Number 4

How to Cite

Chou, Y.-S., Stevenson, J. W. and Singh, P. (2005) Combined Ageing and Thermal Cycling of Compressive MICA Seals for Solid Oxide Fuel Cells, in Advances in Solid Oxide Fuel Cells: Ceramic Engineering and Science Proceedings, Volume 26, Number 4 (ed N. P. Bansal), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291245.ch30

Author Information

  1. K2-44, Materials Division Pacific Northwest National Laboratory P. O. Box 999 Richland, WA 99354

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982343

Online ISBN: 9780470291245

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Keywords:

  • solid oxide fuel cell (SOFC);
  • silicate glass;
  • rigid glass-ceramic;
  • wesgo metals;
  • glass interlayer

Summary

Hybrid Phlogopite mica seals were evaluated in a combined ageing and thermal cycling test. Two interlayers were investigated: a glass and a metallic foil. Samples were first aged at 800°C for ∼500 or ∼1000 hrs in a simulated SOFC environment, followed by short-term thermal cycling. The results of hybrid mica with glass interlayer showed extensive reaction and poor thermal cycle stability after ageing for 1036 hrs and 21 thermal cycles. Use of the brazing alloy as the interlayer showed no interaction with mica over 504 hrs and reasonable leak rates were maintained through 8 cycles. The leakage development was found to be consistent with fracture surface and microstructure analyses.