Designing Sealing Glasses for Solid Oxide Fuel Cells
Thermal and chemical properties of "invert" glasses and glass-ceramics developed for hermetic seals for solid oxide fuel cells are described. The glasses crystallize to form thermally stable pyro- and orthosilicate phases with the requisite thermal expansion match to the Y-stabilized ZrO2 (YSZ) electrolyte. In addition, the glasses bond to Cr-steel substrates at 800-850 °C without forming extensive interfacial reaction products. The thermal expansion characteristics of the glass-ceramics remain essentially unchanged after 28 days at 750 °C. Compositions with lower (<2 mol%) B2O3 contents exhibit the lowest volatilization rates when exposed to wet forming gas at 750 °C.
S. T. Reis and R. K. Brow, "Designing Sealing Glasses for Solid Oxide Fuel Cells," Journal of Materials Engineering and Performance, Springer Verlag, Aug 2006.
The definitive version is available at http://dx.doi.org/10.1361/105994906X117206
Materials Science and Engineering
Aker Industries Inc.
Keywords and Phrases
Hermetic Seals; Glass-ceramics; Solid oxide fuel cells
Article - Journal
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