Resilient Sealing Materials for Solid Oxide Fuel Cells. Final Technical Report for October 1, 2004 to September 30, 2006

摘要

This report describes the development of invert glass compositions designed for hermetic seals in solid oxide fuel cells (SOFC). Upon sealing at temperatures compatible with other SOFC materials (generally greater than or equal to 900 degrees C), these glasses transform to glass-ceramics with desirable thermo-mechanical properties, including coefficients of thermal expansion (CTE) over 11x10(sup -6)/degrees C. The long-term (>four months) stability of CTE under SOFC operational conditions (e.g., 800 degrees C in wet forming gas or in air) has been evaluated, as have weight losses under similar conditions. The dependence of sealant properties on glass composition are described in this report, as are experiments to develop glass-matrix composites by adding second phases, including Ni and YSZ. This information provides design-guidance to produce desirable sealing materials.