用于 SOFC 的碱铝硅酸盐密封剂的热行为和结晶：Al2O3 对 Y2O3 替代的影响

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids Pub Date : 2024-10-07 DOI:10.1016/j.jnoncrysol.2024.123255

D.Yu. Dubovtsev , A.I. Vepreva , D.V. Boldyrev , N.S. Saetova , A.V. Kuzmin

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引用次数: 0

摘要

通过对结晶动力学的详细讨论，研究了在含碱二氧化硅玻璃密封剂中用 Y2O3 逐渐取代 Al2O3 的影响。这种替代对 Tg、Tsphere、THS 和 Tflowing 产生了复杂的影响，这可能与钇在玻璃网络中的作用有关。研究发现，Y2O3 含量的增加会加剧结晶，导致结晶相分数的增长。同时，强烈的结晶似乎对热膨胀系数没有明显的影响：在 850 °C 的空气环境中暴露 1000 小时后，热膨胀系数的平均增量为 1‧10-6 K-1。在 Y2O3 含量大于 2 wt % 的样品中观察到的唯一结晶相是 Na0.8Ca0.3Y0.4Zr0.22Si2.13O6，它是 NaYSi2O6 的 Ca2+- 和 Zr4+ 取代异构体。

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Thermal behavior and crystallization of alkali aluminosilicate sealants for SOFC: Effect of Al2O3 to Y2O3 substitution

The influence of the gradual replacement of Al₂O₃ with Y₂O₃ in alkali-containing silica glass sealants is studied with a detailed discussion of crystallization kinetics. Such substitution has a complex effect on T_g, T_sphere, T_HS, and T_flowing which might be connected with the role of yttrium in the glass network. An increase in the Y₂O₃ content is found to intensify crystallization, causing the growth of the crystalline phase fraction. At the same time, intense crystallization appears to have no pronounced effect on the coefficient of thermal expansion: its average increment after 1000 h of exposure at 850 °C in air atmosphere is <1‧10⁻⁶ K⁻¹. The only crystalline phase observed in samples with Y₂O₃ content greater than 2 wt % is suggested to be Na_0.8Ca_0.3Y_0.4Zr_0.22Si_2.13O₆ which is the Ca²⁺- and Zr⁴⁺-substituted isomorph of NaYSi₂O₆.

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来源期刊

Journal of Non-crystalline Solids 工程技术-材料科学：硅酸盐

CiteScore

6.50

自引率

11.40%

发文量

576

审稿时长

35 days

期刊介绍： The Journal of Non-Crystalline Solids publishes review articles, research papers, and Letters to the Editor on amorphous and glassy materials, including inorganic, organic, polymeric, hybrid and metallic systems. Papers on partially glassy materials, such as glass-ceramics and glass-matrix composites, and papers involving the liquid state are also included in so far as the properties of the liquid are relevant for the formation of the solid. In all cases the papers must demonstrate both novelty and importance to the field, by way of significant advances in understanding or application of non-crystalline solids; in the case of Letters, a compelling case must also be made for expedited handling.