Reactivity of thin metal films on sodium beta'' alumina ceramic in high temperature, low pressure sodium vapor

Astronomy and Astrophysics – Astronomy

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Spaceborne And Space Research Instruments, Apparatus, And Components, Direct Energy Conversion And Storage, Other Topics In Instruments, Apparatus, And Components Common To Several Branches Of Physics And Astronomy

Scientific paper

Electrochemical techniques including impedance spectroscopy are routinely used to test the performance of AMTEC electrodes. These experiments may be carried out in an actual AMTEC cell. or in an sodium exposure test cell SETC where the sodium pressure and the temperature are identical at both the anode and cathode. These tests reveal details of electrode material grain growth, electrode decomposition and reaction of electrode materials with the sodium beta'' alumina solid electrolyte. Tests of the same sort may be used to examine the compatibility of metals and sodium beta'' alumina under simulated AMTEC operating conditions. Preliminary tests comparing rhodium/tungsten, molybdenum, titanium and vanadium electrodes are reported. .

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