Fuel cells which can directly convert the chemical energy into electricity have been developed for a while as they have higher energy conversion efficiencies and less air pollutants. Solid oxide fuel cells (SOFCs) have the highest efficiency among the fuel cells developed as they utilize solid ceramics as the anode, electrolyte, and cathode and operate at high temperatures. The working temperature and start-up time could be effectively reduced in metal-supported solid oxide fuel cells (MS-SOFCs) thanks to their thinner anode-electrolyte-cathode assembly, good electronic and thermal conductivity, and good ductility. MS-SOFCs with a short start-up time are considered for applications in mobile vehicles and auxiliary power systems such that they have received much more attention in recent development of SOFC technology. With a lower operation temperature in MS-SOFCs, braze seals have been practically applied in MS-SOFCs for sealing the anode-electrolyte-cathode assembly and metallic interconnects. Thermal stresses are generally generated in SOFC components due to thermal mismatch in the thermal cycling of SOFC operation. They can cause significant deformation and damage in the components and degrade the structural integrity and electrochemical performance of SOFC stacks under long-term operation. It is thus necessary to investigate the high-temperature mechanical durability of the braze seal/metallic interconnect joint so as to provide necessary information for design and development of highly efficient and reliable MS-SOFC stacks. The objective of this three-year study is to systematically characterize the high-temperature tensile and shear strength, creep, and thermo-mechanical fatigue properties of a braze seal/metallic interconnect joint in MS-SOFC stacks and to develop effective life assessment models. In the first year, the effects of content of braze seal, thermal aging treatment, and working environments (reducing and oxidizing atmospheres) on the tensile and shear joint strength will be investigated. In the second year, creep tests will be conducted in reducing and oxidizing atmospheres to investigate the creep properties of unaged and thermal-aged joint specimens of braze seal and metallic interconnect. In the third year, out-of-phase thermo-mechanical fatigue tests and thermo-mechanical fatigue-creep interaction tests will be conducted to study the mechanical durability of the given joints under MS-SOFC operating conditions. Based on the creep and thermo-mechanical fatigue testing results, it is intended to develop an effective mechanical life assessment model for braze seal/metallic interconnect joints in MS-SOFC stacks.
|Effective start/end date||1/08/19 → 31/07/20|
UN Sustainable Development Goals
In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):
- metal-supported solid oxide fuel cell
- braze seal
- metallic interconnect
- thermo-mechanical fatigue
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