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 degrees 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 eight cycles. The leakage development was found to be consistent with fracture surface and microstructure analyses.
Revised: August 4, 2006 |
Published: June 30, 2005
Citation
Chou Y.S., J.W. Stevenson, and P. Singh. 2005.Combined Ageing and Thermal Cycling of Compressive Mica Seals for Solid Oxide Fuel Cells. In Advances in Solid Oxide Fuel Cells, a collection of papers presented at the 29th International Conference on Advanced Ceramics and Composites, published in Ceramic Engineering and Science Proceedings., 26, 265-272. Westerville, Oh:American Ceramic Society.PNNL-SA-43891.