BaO-Al₂O₃-SiO₂-B₂O₃ Glass-Ceramic SOFCs Sealant: Effect of ZnO Additive

Abstract:

The crystallization of planar solid oxide fuel cells (SOFCs) sealant glasses in the systems BaO-Al₂O₃-SiO₂-B₂O₃ (BaBS) and BaO-Al₂O₃-SiO₂-B₂O₃-ZnO (BaBS-Zn) was investigated via both X-ray diffractometer and scanning electron microscopy with energy dispersive spectroscopy. The effect of nucleation heat-treatment of the BaBS glass at different temperature for 5 hours, i.e. 550 and 590 °C, on the crystallization behavior was also studied. Thermal expansion profiles of the glasses indicate that both glasses have a low sealing temperature. XRD patterns of all BaBS glass-ceramics, devitrified at 800 °C for 30 hours, show that Ba₂Si₃O₈, BaAl₂Si₂O₈, Ba₃B₂O₆ and some unknown crystalline phases were found. It was also found that crystalline size of unknown barium aluminosilicate with low silicon content depends on the nucleation heat-treatment temperature. For the ZnO-containing glass, ZnO reduces the coefficient of thermal expansion value of glass and causes the devitrification of large needle-like barium zinc silicate phases. The crack at the YSZ/BaBS-Zn glass-ceramic interface was also observed. Two barium silicate phases, which are BaZnSiO₄ and BaZn₂Si₂O₇ were devitrified in ZnO-containing glass-ceramic.

• Periodical: Key Engineering Materials (Volume 751)
• Pages: 455-460
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.751.455
• Online since: August 2017
• Authors: Nattapol Laorodphan*, Jiratchaya Ayawanna
• Keywords: Crystallization, Glass-Ceramic Sealant, Nucleation, Planar Solid Oxide Fuel Cells

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