Thermal cycling was conducted on the compressive mica seals at 800 degrees C in air. Thin (~0.1 mm) Muscovite mica was pressed between a metal tube and an alumina substrate and tested for leak rates at a stress of 100 psi in the the advanced design and the plain design. The advanced design involves adding two glass interlayers and was found to grealy reduce the leak rates. Two metals (Inconcl #600 and SS430) with high and low coefficients of thermal expansion (CTE) were used to evaluate the effect of CTE mismatch on thermal cycling. The results showed that the leak rates were lower for teh advanced design than the plain micas. In addition, using the lower CTE (SS430) metal tube resulted in lower leak rates as compared to Inconel #600 metal (high CTE). In general, the leak rates abruptly increased during the first couple of cycles, and the
Revised: November 10, 2005 |
Published: August 25, 2003
Citation
Chou Y.S., and J.W. Stevenson. 2003.Thermal Cycling of Advanced Compressive Seals for Solid Oxide Fuel Cells. In Advances in Joining of Ceramics: Proceedings of the Joining of Ceramics Symposium: Held at the 104th Annual Meeting of the American Ceramic Society, April 28-May 1, 2002 in St. Louis, Missouri., edited by CA Lewisohn; M Singh; RE Loehman, 138, 175-184. Westerville, Ohio:American Ceramics Society.PNNL-SA-38015.