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。此外，在運轉高溫階段，熱應力的長久作用，亦會造成電池堆接合件受到潛變機制作用的影響，產生過大變形甚至斷裂的可能，因此對SOFC電池堆接合件進行高溫耐久機械性能分析，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核研所開發之封裝玻璃陶瓷及封裝玻璃陶瓷/金屬連接板之接合件進行在工作溫度下之潛變試驗，並將對電池片/封裝玻璃陶瓷/金屬連接板之接合件進行在工作溫度下之破裂阻抗試驗，分析其破損機制，並進一步探討裂縫於接合件各層內部與介面間的成長行為，進而建立平板式SOFC電池堆接合件耐久破裂強度評估模式，作為核研所設計平板式電池堆組件結合之參考，並協助核研所發展改善電池堆接合件耐久強度之技術。Solid oxide fuel cells (SOFCs) operate at a high-temperature range of 650 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 caused from mismatch of coefficients of thermal expansion among various components and temperature gradients in the SOFC system. When a ceramic component is held under such a prolonged thermal load (stress), pre-existent pores or defects which are subcritical, i.e. less than the critical defect size for immediate failure, can grow to failure and degrade the performance of an SOFC system during service. The purpose of this proposed study is to characterize the high-temperature mechanical durability of components in a planar SOFC (pSOFC) system which is being developed at the Institute of Nuclear Energy Research (INER). Creep tests of the glass-ceramic sealant/metallic interconnect joint as well as the glass-ceramic sealant itself will be continued in this study. In addition, testing techniques to characterize the high-temperature fracture energy of a joint made of ceramic PEN, glass-ceramic sealant, and metallic interconnect will be developed. Fracture mechanisms of the multi-layered joint will be characterized in order to develop a suitable analysis model of the fracture energy for various glass-ceramic joints in pSOFCs. Based on the experimental results, an appropriate life assessment model for pSOFC stack joints will be developed and applied to the pSOFC system being developed at INER. 研究期間：10101~ 10112
