Title

Viscous Sealing Glass Development for Solid Oxide Fuel Cells

Abstract

Glass compositions have been formulated and tested for use as viscous seals for solid oxide fuel cells (SOFCs). These alkali-free borosilicate glasses possess desirable thermomechanical properties and thermo-chemical characteristics, and exhibit promising hermetic sealing and self-healing behavior under SOFC operational conditions. The dilatometric softening points (Ts) and the glass transition temperatures (Tg) of the glasses are generally under 650°C, the lower bound of the SOFC operating temperature. To date, glass seals between a YSZ-NiO/YSZ bilayer and aluminized stainless steel 441 have survived 100 thermal cycles (750°C to room temperature) in dry air at a differential pressure of 0.5 psi (26 torr) over the course of > 3,300 hours without failure, and 103 thermal cycles under wet forming gas. Seals intentionally cracked upon quenching from 800°C to RT at >25°C/s become hermetic upon reheating to 700°C and higher.

Meeting Name

Advances in Solid Oxide Fuel Cells IX -- 37th International Conference on Advanced Ceramics and Composites (2013: Jan. 27-Feb. 1, Daytona Beach, FL)

Department(s)

Mining and Nuclear Engineering

Second Department

Materials Science and Engineering

Keywords and Phrases

Differential pressures; Dilatometric softening; Glass compositions; Operating temperature; Operational conditions; Room temperature; Solid oxide fuel cells (SOFCs); Thermomechanical properties; Borosilicate glass; Ceramic materials; Hermetic seals; Thermal cycling; Solid oxide fuel cells (SOFC)

International Standard Serial Number (ISSN)

1966219

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2014 Wiley-Blackwell, All rights reserved.


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