Abstract The crystallization ability plays a key role in effecting thermal ability of sealing glass for intermediate temperature-solid oxide fuel cells (IT-SOFCs) to prevent fuel leakage during operation and insulate the cell stack from the external atmosphere. Herein, using differential thermal analysis (DTA) techniques, the growth mode of crystals precipitated in BaO-CaO-Al2O3-B2O3-SiO2 (BCABS) sealing glass through the heat treatment was calculated in terms of non-isothermal crystallization kinetics for the first time. The calculated results showed that the average kinetic exponent n of the glass was approximatively 1, indicating that the crystal nucleuses became to form and further grew with one-dimensional mode from the surface inwards. Scanning electron microscope (SEM) observations clearly revealed that a large number of one-dimensional filamentous crystals have been formed on the interface between the sealing glass and the electrolyte after the heat treatment at 973 K for 100 h, which perfectly coincided with the theoretical calculations, and the glass was well combined with the electrolyte without any visible cracks or peeling at the interface. The one-dimensional growth of hexagonal BaAl2Si2O8 crystals verified by X-ray diffraction (XRD) could effectively decelerate the decrease of thermal expansion coefficient of glass to ensure enhance the thermo-stability of the BCABS sealing glass for IT-SOFC.

中文翻译：

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IT-SOFCs密封用BaO-CaO-Al2O3-B2O3-SiO2玻璃的非等温结晶动力学研究

摘要 结晶能力在影响中温固体氧化物燃料电池（IT-SOFCs）密封玻璃的热性能中起着关键作用，以防止运行过程中燃料泄漏并使电池堆与外部大气隔离。在此，利用差热分析（​​DTA）技术，首次从非等温结晶动力学的角度计算了BaO-CaO-Al2O3-B2O3-SiO2（BCABS）封接玻璃热处理时析出晶体的生长模式. 计算结果表明，玻璃的平均动力学指数n约为1，表明晶核从表面向内形成并进一步以一维模式生长。扫描电子显微镜（SEM）观察清楚地表明，在 973 K 热处理 100 小时后，密封玻璃与电解液的界面上形成了大量一维丝状晶体，与理论计算完全吻合。 ，并且玻璃与电解液结合良好，界面处没有任何可见的裂纹或剥落。X射线衍射（XRD）验证的六方BaAl2Si2O8晶体的一维生长可以有效减缓玻璃热膨胀系数的下降，确保提高IT-SOFC用BCABS密封玻璃的热稳定性。这与理论计算完全吻合，玻璃与电解液结合良好，界面处没有任何可见的裂纹或剥落。X射线衍射（XRD）验证的六方BaAl2Si2O8晶体的一维生长可以有效减缓玻璃热膨胀系数的下降，确保提高IT-SOFC用BCABS密封玻璃的热稳定性。这与理论计算完全吻合，玻璃与电解液结合良好，界面处没有任何可见的裂纹或剥落。X射线衍射（XRD）验证的六方BaAl2Si2O8晶体的一维生长可以有效减缓玻璃热膨胀系数的下降，确保提高IT-SOFC用BCABS密封玻璃的热稳定性。