金屬支撐固態氧化物燃料電池（Metal-supported Solid Oxide Fuel Cell, MS-SOFC）具有高抗氧化還原及抗熱震之特性，極具潛力應用於快速啟動之發電系統或移動載具之輔助電力裝置。MS-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。在SOFC的操作使用過程中亦會因為開機、待機或停機的狀態，反覆的升溫至高溫工作環境、高溫持溫及降溫回到室溫，造成應力與溫度同時產生循環變化，會使得硬銲填料/金屬連接板接合件產生熱機疲勞損傷，因此，有必要對接合件進行熱機疲勞試驗，以瞭解SOFC電池堆接合件耐久機械性能，亦是開發SOFC電池堆不可或缺的步驟。依此，配合核研所開發適用於MS-SOFC之高溫硬銲合金材料，本計畫將對該硬銲合金材料與金屬連接板之接合件進行在室溫及高溫工作環境間之熱機負載循環作用之耐久機械性能試驗，分析其熱機疲勞破損機制，進而建立MS-SOFC電池堆接合件耐久結構強度評估模式，作為核研所設計與開發MS-SOFC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。 ;Metal-supported solid oxide fuel cells (MS-SOFCs) have recently received much more attention, in particular for applications in mobile vehicles and auxiliary power systems, as they have a lower working temperature and a shorter start-up time in comparison with other types of SOFC. Braze seals have been applied to MS-SOFCs for sealing the anode-electrolyte-cathode assembly and metallic interconnects thanks to a lower operation temperature in MS-SOFCs. The high-temperature operating conditions could generate significant thermal stresses in an SOFC stack due to thermal mismatch between components. During periodic operation, thermal stresses change simultaneously and cyclically with temperature in each component of an SOFC stack. As such cyclic thermo-mechanical loading damage may accelerate degradation of the sealant/interconnect joint robustness, it is necessary to assess such effect on the structural integrity and cycle life of MS-SOFC stack. The aim of this study is thus to investigate the thermo-mechanical fatigue behavior of the braze seal/metallic interconnect joint in MS-SOFC. Based on the thermo-mechanical fatigue testing results, it is intended to develop an effective mechanical life assessment model for braze seal/metallic interconnect joints which can be applied to the MS-SOFC system being developed at the Institute of Nuclear Energy Research.
