Optimum processing parameters to improve sealing performance in solid oxide fuel cells


Ertugrul T. Y. , Celik S., Mat M. D.

Ceramics International, vol.41, no.8, pp.9834-9842, 2015 (Peer-Reviewed Journal) identifier

  • Publication Type: Article / Article
  • Volume: 41 Issue: 8
  • Publication Date: 2015
  • Doi Number: 10.1016/j.ceramint.2015.04.057
  • Journal Name: Ceramics International
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.9834-9842
  • Keywords: Glass-ceramic sealant, Solid oxide fuel cell, Thermal treatment, Wetting behavior

Abstract

© 2015 Elsevier Ltd and Techna Group S.r.l.Abstract Glass-ceramic composites are among the favorable candidates as a sealing material for solid oxide fuel cells (SOFC). In order to obtain a reliable, robust and hermetic sealing, the glass-ceramics must chemically bond to both the metallic interconnector and the ceramic electrolyte. A high-bonding strength and good wetting, which strongly depend on the thermal treatment, are always preferred to ensure gas-tight sealing. The thermal treatment involves three stages: binder burnout (stage-I), sintering (stage-II), and cooling (stage-III). This study investigates effects of various parameters on the sealing quality at the sintering stage. The effects of sintering temperature, clamping pressure and sealant thickness are considered. The glass-ceramic laminates are produced employing a tape casting method. The sealing quality is evaluated by measuring leakage and final macro-structure of the sealing region. It is suggested that a 900-930°C sintering temperature and 1.5-7.6 N cm-2 clamping pressure ranges are better for successful sealing. The initial thickness of glass-ceramic laminates is also desired to be between 0.25-0.5 mm thickness range for both a cost-effective and reliable sealing.