An Alkali-Free Barium Borosilicate Viscous Sealing Glass for Solid Oxide Fuel Cells
An alkali-free, alkaline earth borosilicate glass (designated G102) has been developed as a viscous sealant for use with solid oxide fuel cells (SOFCs). The glass possesses the requisite viscosity, electrical resistivity, and thermal and chemical stability under SOFC operating conditions to act as a reliable sealant. Sandwich seals between aluminized stainless steel and a YSZ/NiO-YSZ bilayer survived 148 thermal cycles (800°C to room temperature) in both oxidizing and reducing atmospheres at a differential pressure of ~3.4 kPa (0.5 psi) without failure. For sandwich seals that were held at 800°C for up to 2280 h in air, G102 resisted crystallization, there were limited interactions at the G102/YSZ interface, but BaAl2Si 2O8 crystals formed at the glass/metal interface because of the reaction between the glass and the aluminized steel. Sandwich seals that were intentionally cracked by thermal shock resealed to became hermetic upon reheating to temperatures as low as 744°C.
J. Hsu et al., "An Alkali-Free Barium Borosilicate Viscous Sealing Glass for Solid Oxide Fuel Cells," Journal of Power Sources, vol. 270, pp. 14-20, Elsevier, Dec 2014.
The definitive version is available at https://doi.org/10.1016/j.jpowsour.2014.07.088
Mining and Nuclear Engineering
Materials Science and Engineering
Keywords and Phrases
Borosilicate glass; Electric conductivity; Hermetic seals; Sealants; Surface chemistry, Differential pressures; Operating condition; Reducing atmosphere; Sealing glass; Self-healing; Solid oxide fuel cells (SOFCs); Thermal and chemical stabilities; Volatility; Solid oxide fuel cells (SOFC)
International Standard Serial Number (ISSN)
Article - Journal
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