The thermal stability of sodium beta″-Alumina solid electrolyte ceramic in AMTEC cells
The thermal stability of sodium beta″-Alumina solid electrolyte ceramic in AMTEC cells
复制标题
AMTEC电池中β钠-氧化铝固体电解质陶瓷的热稳定性
DOI：
10.1063/1.57523
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
J. Kulleck
中科院分区：
文献类型：
--
作者：
R. Williams;M. Ryan;M. Homer;L. Lara;K. Manatt;V. Shields;R. H. Cortez;J. Kulleck
用于长期太空任务的碱金属热电转换器 (AMTEC) 设备的关键组件是 β''-氧化铝固体电解质陶瓷 (BASE)，目前尚无替代品。 BASE 保持稳定的温度和环境条件控制着 AMTEC 设备的运行参数。我们在真空至 1573K 下使用质量损失实验来表征 BASE 分解的动力学，并在充满钠蒸气的暴露池中测量至 1223K 的电导率和交换电流，以研究影响其离子电导率的 BASE 变化。尽管可能会发生有限的苏打损失，但没有明确的证据表明 BASE 在低于 1273K 时会直接热分解。活性金属（例如 Mn 或 Cr）可以在至少低至 1223K 的温度下与 BASE 发生反应。
A critical component of alkali metal thermal-to electric converter (AMTEC) devices for long duration space missions is the beta″-alumina solid electrolyte ceramic (BASE), for which there exists no substitute. The temperature and environmental conditions under which BASE remains stable control operational parameters of AMTEC devices. We have used mass loss experiments in vacuum to 1573K to characterize the kinetics of BASE decomposition, and conductivity and exchange current measurements in sodium vapor filled exposure cells to 1223K to investigate changes in the BASE which affect its ionic conductivity. There is no clear evidence of direct thermal decomposition of BASE below 1273K, although limited soda loss may occur. Reactive metals such as Mn or Cr can react with BASE at temperatures at least as low as 1223K.