A critical component of alkali metal thermal-to electric converter (AMTEC) devices for long duration space missions is the sodium -alumina solid electrolyte ceramic (BASE), for which there exists no substitute. The major phase in this ceramic, sodium -alumina shows no evidence of thermal decomposition in AMTEC environments including clean liquid sodium and low pressure sodium gas, at temperatures below 1173K, or in vacuum below 1273K. This paper presents additional results of ionic conductivity and exchange current studies in sodium exposure test cells (SETCs) to characterize the changes occurring in BASE below 1273K in low pressure sodium vapor. Also presented are additional annealing studies to characterize the kinetics of processes occurring in the BASE ceramic in the AMTEC operating regime.
Thermal stability of -alumina solid electrolyte under AMTEC operating conditions
SPACE TECHNOLOGY AND APPLICATIONS INTERNATIONAL FORUM - 2000 ; 2000 ; Albuquerque, New Mexico (USA)
AIP Conference Proceedings ; 504 , 1 ; 1408-1411
19.01.2000
4 pages
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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