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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Sol-gel synthesis and characterization of barium (magnesium) aluminosilicate glass sealants for solid oxide fuel cells
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Sol-gel synthesis and characterization of barium (magnesium) aluminosilicate glass sealants for solid oxide fuel cells

机译：固体氧化物燃料电池钡（镁）铝硅酸盐玻璃密封剂的溶胶-凝胶合成与表征

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Solid oxide fuel cells (SOFC) correspond to efficient energy conversion systems coupled with low emissions of pollutants. In the aim to fabricate high temperature planar SOFC, glass and glass-ceramic sealants are developed to associate several criteria and properties: high thermal expansion (11.0 to 12.0 · 10~(- 6) K~(- 1)), high electrical resistance > 2 kΩ/cm~2, good thermochemical compatibility with the other active materials of the fuel cell, and stability under H_2 and H _2O atmospheres at an operation temperature of 800 °C for a long time. According to these requirements, new BAS (BaO-Al_2O _3-SiO_2) and BMAS (BaO-MgO-Al_2O _3-SiO_2) glass-ceramic sealants have been developed by sol-gel route which is a non-conventional process for such applications. By this soft chemistry process, we anticipate a decrease in the glasses processing temperature due to a better homogeneity between cationic precursors in the mixture and a more important reactivity of materials. Experimental results in terms of thermomechanical properties, thermal expansion coefficient, crystalline phase content, and microstructure were discussed. In particular, the influence of the %BaO on the thermomechanical properties of glass-ceramics was described. Changes in properties of glass-ceramics were closely related to the microstructure. The influence of MgO on glass processing temperatures, on the structure and on the microstructure is evaluated in order to confirm that these glass-ceramics are promising candidates to SOFC applications. So, after performing a systematic investigation to the various systems, the properties of suitable glass were proposed.
机译：固体氧化物燃料电池（SOFC）对应于高效的能量转换系统，同时污染物排放低。为了制造高温平面型SOFC，开发了玻璃和玻璃陶瓷密封剂以关联多个标准和性能：高热膨胀（11.0至12.0·10〜（-6）K〜（-1）），高电阻> 2kΩ/ cm〜2，与燃料电池的其他活性材料具有良好的热化学相容性，并在800°C的工作温度下长时间在H_2和H _2O气氛下具有稳定性。根据这些要求，已经通过溶胶-凝胶法开发了新的BAS（BaO-Al_2O _3-SiO_2）和BMAS（BaO-MgO-Al_2O _3-SiO_2）玻璃陶瓷密封剂，这是非常规方法。通过这种软化学过程，由于混合物中阳离子前体之间更好的均一性和更重要的材料反应性，我们预计玻璃加工温度会降低。讨论了根据热力学性质，热膨胀系数，晶相含量和微观结构的实验结果。特别地，描述了％BaO对玻璃陶瓷的热机械性能的影响。微晶玻璃性能的变化与微观结构密切相关。评估了MgO对玻璃加工温度，结构和微结构的影响，以确认这些玻璃陶瓷是SOFC应用的有希望的候选者。因此，在对各种系统进行了系统研究之后，提出了合适的玻璃的性能。

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