A typical F-design SOFC short stack of Forschungszentrum JOlich was metallographically analyzed after long-term steady-state operation for 17,000 h at 700°C and 0.5 A/cm~2. After scheduled shut down, the stack was partly embedded in resin and subsequently various stack parts were cut from multiple places of interest. All important components (cell, metal parts, sealant, and contact layers) were characterized with respect to microstructural and chemical changes and interactions with the adjacent components. Surprisingly, the post-test characterization revealed less changes and interactions than expected. One clear feature that could be observed was the interaction between the (La,Sr)(Co,Fe)O_3 cathode and volatile chromium species. Another finding was spot-like corrosion in the metallic parts, but this did not cause severe damage. It can be concluded that by tailoring the component materials and the operational conditions, long-term operation of this type of SOFC stacks is possible.
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机译：在700°C和0.5 A / cm〜2的长期稳态运行17,000 h后，对金盏花的典型F型SOFC短烟囱进行了金相分析。在计划关闭后，将堆栈部分包埋在树脂中，然后从多个感兴趣的地方切下各个堆栈部分。所有重要的组件（电池，金属零件，密封剂和接触层）都根据微观结构和化学变化以及与相邻组件的相互作用进行了表征。出乎意料的是，测试后的表征显示出比预期更少的变化和相互作用。可以观察到的一个明显特征是（La，Sr）（Co，Fe）O_3阴极与挥发性铬物质之间的相互作用。另一个发现是金属零件上出现点状腐蚀，但这并未造成严重损坏。可以得出结论，通过调整组件材料和运行条件，可以长期使用这种类型的SOFC烟囱。
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