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)

Nuclear Engineering and Radiation Science

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)

0196-6219

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2014 Wiley-Blackwell, All rights reserved.

Publication Date

01 Jan 2014

Link to Full Text

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