SiO2-Al2O¬3-Y2O3-ZnO密封玻璃應用於固態氧化物燃料電池之研發

Development of SiO2-Al2O3-Y2O3-ZnO based glass sealant for Solid Oxide Fuel Cells

鄭捷升(Chieh-Sheng Cheng)

指導教授 ： 王錫福

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2012年)

摘要

本研究目的為開發無添加B2O3及鹼土族的封裝玻璃，以SiO2-Al2O3-Y2O3-ZnO系統，並且複合高膨脹係數陶瓷粉末製備玻璃封裝膏，應用於固態氧化物燃料電池之高溫封裝。藉由不同的ZnO添加量來調整玻璃轉換溫度(Tg)，使玻璃在SOFC應用溫度時表現出軟化流動特性，來填補縫隙達到密封效果。而研究中也發現ZnO含量的添加會使玻璃結晶溫度(Tc)下降，當ZnO添加量使ZnO/SiO2比大於1時，玻璃熱處理時結晶現象越明顯。而在不鏽鋼與玻璃黏合方面YAS4-50、YAS5-50及YAS5-90在與不鏽鋼黏合時有良好的潤濕性，可有效的與不鏽鋼緊密黏合。在未複合陶瓷粉末前其玻璃漏氣率量測以YAS1-50及YAS5-50玻璃漏氣率為最低，其在700oC持溫5 hr、荷重為1 psi及進氣壓力為1 psi的條件下，YAS1-50及YAS5-50在高溫漏氣率分別為0.028 sccm/cm及0.09 sccm/cm，而當玻璃經過熱膨脹係數調整過後YAS5-50環漏氣率可由0.09 sccm/cm下降至0.04 sccm/cm，且常溫區漏氣率也有下降的趨勢，由0.185 sccm/cm下降到0.148 sccm/cm。因此玻璃在複合高膨脹係數陶瓷粉末後，能有效降低玻璃高溫與低溫時的漏氣率，在SOFC應用上是非常有潛力的。

關鍵字

固態氧化物燃料電池 ； 玻璃封裝 ； 漏氣率 ； 玻璃膏

並列摘要

This study was to develop SiO2-Al2O3-Y2O3-ZnO system glasses free of B2O3 and Alkaline earth metals, and composite with high expansion coefficient ceramic powder sealants for SOFC applications. By adding ZnO to reduce the glass transition temperature (Tg), glass was softening in SOFC application temperature and its cracks was filled and sealed. It was also found that crystallization temperature (Tc) decreased when adequate ZnO was added (ZnO/SiO2 > 1). The glass crystallization was more significant. In this study, the glass YAS4-50, YAS5-50, and YAS5-90 with better wettability could effectively bond with stainless steel. At the temperature of 700oC, compressive stress 1 psi, and pressure at Plate 1 psi, leak rate of glass YAS1-50 and YAS5-50 was lowest before compositing with ceramic powder. Leak rate of YAS1-50 was 0.028 sccm/cm and YAS5-50 was 0.09 sccm/cm. After adjusting the coefficients of thermal expansion, leak rate of YAS5-50 was decreased from 0.09 sccm/cm to 0.04 sccm/cm. The leak rate was also decreased at room temperature, from 0.185 sccm/cm to 0.148 sccm/cm. Result mentioned above indicates leak rate of glass was significantly decreased after compositing with high expansion coefficient ceramic powder, which supports further study in SOFC applications.

並列關鍵字

Solid Oxide Fuel Cell ； Glass ； Seal ； Leak Rate

參考文獻

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