以Al2O3和Al微粉为主要原料, 采用流延成型工艺生产的Al2O3基密封材料, 在模拟的平板式ITSOFC密封环境中对材料的密封性能进行测试, 并借助X射线衍射仪、扫描电子显微镜对测试后的材料进行表征. 结果表明, 采用优化的流延成型工艺可以生产出柔韧性良好的Al2O3基密封材料. Al2O3基密封材料在较小的外加压力下表现出较好的密封性能. Al微粉的加入, 减少了材料中的漏气通道, 增加了漏气通道的弯曲程度, 不仅提升了材料的密封效果, 而且改善了材料的中期稳定性. 采用流延成型含10wt%~20wt%Al微粉的Al2O3基密封材料以压密封方式来实现平板式ITSOFC的密封是可行的.
The Al2O3-based seals were prepared by tape casting process using Al2O3 and Al fine powders as primary starting materials. The materials’ hermetic properties were tested in simulative environment of the sealing of planar ITSOFC, and the materials after hermetic property test were characterized by X-ray diffraction and scanning electron microscope. The results show the flexible Al2O3-based seals are successfully prepared by appropriate tape casting process. The Al2O3-based seals have favorable sealing characteristics even though the compressive stresses are quite low. The leak paths are reduced and the tortuosity of leak paths are aggrandized when Al fine powders are added into Al2O3-based seals, which enhance the materials’ hermetic property and mid-term stabilities. It is feasible that Al2O3-based seals with 10wt%--20wt% Al fine powders prepared by tape casting are used as sealing materials for the planar ITSOFCs.
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