Long-Term Thermal Cycle Stability of an Ultra-Thermal Stable Sealing Glass Seal

摘要

Sealing has been identified as one of the toughest technical challenges to the development of planar pSOFCs. Glass/glass-ceramic materials are the most commonly used sealants for pSOFCs. However, glass based seals usually have poor thermal stability, where significant change of thermal expansion coefficient (TEC) has been commonly observed during the exposure of the material at high temperature [1], due primarily to the crystallization of glass based seals. The change of the TEC value can induce significant thermal stress at the sealing interface, and will ultimately cause the failure of the sealing when the thermal stress reaches a critical point. So, the thermal stability of current state of the art sealing glass/glass-ceramics still needs to be much improved.