Compliant Glass Composite Sealants for SOFC Stacks
- Mo-Sci Corporation, Rolla, MO (United States)
Solid oxide fuel cells (SOFCs) require robust, hermetic seals that can prevent both fuel leakage and direct mixing of fuel and air. The seal materials should be electrical insulators and should be chemically and mechanically stable in high temperature reactive environments (e.g., moist reducing and/or oxidizing conditions). The seals should exhibit no deleterious interfacial reactions with other cell components, should be created at a low enough temperature to avoid damaging cell components (not higher than 900°C for some materials), and should not migrate or flow from the designated sealing region because of any applied load during cell operation. In addition, the seals should be able to withstand numerous thermal cycles between the operational temperature (e.g., 700-900°C) and room temperature. The developed “compliant (or viscous)” glass composite sealants possess desirable thermo-mechanical properties and thermo-chemical characteristics. The glass composite seals withstood repeated thermal cycles under the SOFC operating conditions. In addition, they are able to accommodate relative motion between the surfaces being sealed without the development of permanent leaks, and to “reseal” cracks created from thermal stresses through viscous flow.
- Research Organization:
- Mo-Sci Corporation, Rolla, MO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- SC0018558
- OSTI ID:
- 1490370
- Type / Phase:
- SBIR (Phase I)
- Report Number(s):
- DOE-MO-SCI-0018558
- Country of Publication:
- United States
- Language:
- English
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