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2009
Conference Paper
Titel
Influence of electrical load on the stability of glass sealings
Alternative
Einfluss elektrischer Belastung auf die Stabilität von Glasdichtungen
Abstract
Gastight and stable sealings are crucial for reliable service of solid oxide fuel cells (SOFCs). Failures of sealings are conceivable for many reasons resulting in damage of the whole SOFC-stack. Reactions between sealing and interconnector materials (Crofer 22 APU) at high temperatures under oxidizing and reducing conditions affect the bonding strength and microstructure of the glass to metal interface. Electric voltage across the glass sealings lead to additional effects at anodically and cathodically polarized interfaces. Tests of model sealings under electric voltage in combination with dual atmosphere provide information about the stability of sealing glasses under SOFC-relevant operating conditions.