平板式固態氧化物燃料電池（SOFC）系統在運轉使用時，隨著工作溫度的改變，由於不同組件間具有不同的熱膨脹係數值，加上工作環境溫度分佈不均勻，因而會產生不可忽視的熱應力。對電池堆的陶瓷電池片及封裝接合使用之玻璃陶瓷膠而言，熱應力可以促進玻璃陶瓷材料既存孔隙或缺陷成長為較大的裂縫造成組件的洩漏或破損，降低電池的效率，因此對SOFC電池堆接合件進行破裂行為分析，將是開發平板式SOFC電池堆不可或缺的步驟。依此，配合核研所開發平板式SOFC發電系統，本計畫本年度除了持續對[金屬連接板/封裝玻璃陶瓷/金屬連接板]接合件及[電池片/封裝玻璃陶瓷/金屬連接板]接合件進行在室溫及工作溫度下之破裂阻抗試驗外，分析其破損機制，並進一步對SOFC電池堆在運轉過程各階段受熱應力作用之破裂力學性質進行有限元素模擬分析，探討裂縫於電池片本體及接合件各層介面間的成長行為，並結合破裂阻抗試驗所量測之破裂韌性值，建立平板式SOFC電池堆結構破裂強度評估模式，作為核研所設計平板式SOFC電池堆結構之參考，並協助核研所發展改善SOFC電池堆結構耐久強度之技術。 ; Solid oxide fuel cells (SOFCs) operate at a high-temperature range of 650 oC to 1000oC in a direct conversion process such that they have the highest efficiencies of all fuel cells. The high-temperature operation, however, gives rise to significant thermal stresses in the SOFC system due to thermal mismatch between components. When a ceramic component is held under such a prolonged thermal load (stress), pre-existing, subcritical pores or defects can grow to failure and degrade the performance of an SOFC system during service. The purpose of this study is to characterize the high-temperature fracture behavior of components in a planar SOFC (pSOFC) system which is being developed at the Institute of Nuclear Energy Research (INER). Fracture resistance tests of the metallic interconnect/glass-ceramic sealant/metallic interconnect joint as well as the PEN/glass-ceramic sealant/metallic interconnect joint will be continuously conducted in this study. Fracture mechanisms of the multi-layered joints will be characterized in order to develop a suitable analysis model of fracture resistance for various glass-ceramic joints in pSOFCs. In addition, simulation of the interfacial cracking behavior in the joint of PEN/glass-ceramic sealant/metallic interconnect under SOFC operating conditions will be performed using finite element method. Based on the experimental and simulation results, an appropriate fracture strength assessment model for pSOFC stack joints will be developed and applied to the pSOFC system being developed at INER. ; 研究期間 10201 ~ 10212
