【摘要】 研究非桥氧含量对固体氧化物电解池用BaCaAlSi体系玻璃结构变的影响,研究几种BaCaAlSi玻璃的高温物理性能。首先利用红外光谱分析不同组分对玻璃结构中的键性影响,分析不同成分玻璃中的非桥氧数量的多少。结果发现,随氧硅比的变大,非桥氧的数量随之增加,同时发现玻璃基本物理性能也跟着发生变化,玻璃软化点也随之降低,1、2、3号玻璃软化点分别为752,675,650℃,同时玻璃的高温粘度和表面张力也随之降低,而玻璃的热膨胀系数则增加,其中2、3号玻璃的平均热膨胀系数都超过10.0×10-6K-1。用高温电镜观察玻璃从室温到熔融温度的物性变化规律,发现随碱土金属氧化物的含量增加,玻璃表面平滑点温度也随之降低。更多还原

【Abstract】 In this paper, the structure and basic high temperature physical properties of Ba-Ca-Si-Al system sealing material, which was used in solid oxide electrolysis electrolytic cell (SOEC), were researched. First, the infrared spectra were used to estimate the glass structure and number of non-bridging oxygen (NBO) in as-fabricated glasses with different components. It was founded that the number of non-bridging oxygen increased with the increasing of O/Si ratio, and their basic physical properties also were changed. The glass softening point was changed from 752°C to 650°C with the increasing of NBO, at the same time, the high temperature viscosity and surface tension also decreased. But the coefficient of thermal expansion (CTE) was significantly increased, notedly, the average CTE of 2, 3 glasses reached more than 10.0 ×10-6K-1. Observed by high-temperature electron microscopy from room temperature to melting temperature, the glass surface smooth point temperature decreased with the increasing of alkaline earth oxides content.更多还原