Synthesis and properties of a barium aluminosilicate solid oxide fuel cell glass–ceramic sealant

A series of barium aluminosilicate glasses modified with CaO and B 2O 3 were prepared and evaluated with respect to their suitability in sealing planar solid oxide fuel cells (SOFCs). At a target operating temperature of 750 °C, the long-term coefficient of thermal expansion (CTE) of one particular...

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Bibliographic Details
Published in:Journal of power sources 2008-07, Vol.182 (1), p.188-196
Main Authors: Meinhardt, K.D., Kim, D.-S., Chou, Y.-S., Weil, K.S.
Format: Article
Language:English
Subjects:
Aluminosilicates
Aluminum silicates
Applied sciences
Coefficient of thermal expansion
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fuel cells
Glass
Glass ceramics
Glass–ceramic sealant
Sealers
Sealing
Solid oxide fuel cell (SOFC)
Solid oxide fuel cells
Yttria stabilized zirconia
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Summary:A series of barium aluminosilicate glasses modified with CaO and B 2O 3 were prepared and evaluated with respect to their suitability in sealing planar solid oxide fuel cells (SOFCs). At a target operating temperature of 750 °C, the long-term coefficient of thermal expansion (CTE) of one particular composition (35 mol% BaO, 15 mol% CaO, 10 mol% B 2O 3, 5 mol% Al 2O 3, and bal. SiO 2) was found to be particularly stable, due to devitrification to a mixture of glass and ceramic phases. This sealant composition exhibits minimal chemical interaction with the yttria-stabilized zirconia electrolyte, yet forms a strong bond with this material. Interactions with metal components were found to be more extensive and depended on the composition of the metal oxide scale that formed during sealing. Generally alumina-scale formers exhibited a more compact reaction zone with the glass than chromia-scale forming alloys. Mechanical measurements conducted on the bulk glass–ceramic and on seals formed using these materials indicate that the sealant is anticipated to display adequate long-term strength for most conventional stationary SOFC applications.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2008.03.079