| Summary: | 碩士 === 國立臺北科技大學 === 材料及資源工程系研究所 === 99 === High temperature hermetic seal is essential for utilizing the full potentials of plannar solid oxide full cell (SOFC). A seal glass-ceramic needs to have excellent thermal and chemical stabilities, mechanical integrity, and sealing ability in stringent oxidizing and reducing environments for hundreds of thermal cycles. Several compositions based on Si-Al-La-Sr-(Zn,Ti) glass system have been studied in this investigation to observe their applicability as sealant for SOFC. To increase the ZnO content can effectively reduce the glass transition temperature and softening temperature. To increase the SrO content can effectively improve coefficient of thermal expansion for glass-ceramics.
In this study, the glass-ceramics SALSZT10 and SALSTi11 have well wettability, and they can effectively bond with stainless steel SUS430 and GDC20. The thermal expansion coefficient of glass-ceramics SALSZT10 and SALTi11 is between 8.5~9.7×10-6/°C. Furthermore, they have lower leak rate value between 0.003~0.004 sccm/cm. The novel glass-ceramics SALSZT07 has special properties, which is unable bonded with stainless streel SUS430 because of the poor wettability. However, SALSZT07 has well gas tightness, and the leak rate is 0.0045 sccm/cm at cells operation temperature (700°C), and the leak rate is 0.03 sccm/cm at room temperature.
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