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 ZrO s...

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Veröffentlicht in:Journal of materials engineering and performance 2006-08, Vol.15 (4), p.410-413
Hauptverfasser: Reis, ST, Brow, R K
Format: Artikel
Sprache:eng
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Zusammenfassung: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 ZrO sub(2) (YSZ) electrolyte. In addition, the glasses bond to Cr-steel substrates at 800-850 degree C without forming extensive interfacial reaction products. The thermal expansion characteristics of the glass-ceramics remain essentially unchanged after 28 days at 750 degree C. Compositions with lower ( less than or equal to 2 mol%) B sub(2)O sub(3) contents exhibit the lowest volatilization rates when exposed to wet forming gas at 750 degree C.
ISSN:1059-9495
1544-1024
DOI:10.1361/105994906X117206