Optimum processing parameters to improve sealing performance in solid oxide fuel cells
Ceramics International, cilt.41, sa.8, ss.9834-9842, 2015 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 41 Sayı: 8
- Basım Tarihi: 2015
- Doi Numarası: 10.1016/j.ceramint.2015.04.057
- Dergi Adı: Ceramics International
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.9834-9842
- Anahtar Kelimeler: Glass-ceramic sealant, Solid oxide fuel cell, Thermal treatment, Wetting behavior
- Ankara Yıldırım Beyazıt Üniversitesi Adresli: Evet
Özet
© 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.