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Preparation and characterization of ion-exchanged Ni-Na-β”-Al2O3 and Fe-Na-β”-Al2O3 solid electrolytes for applications in liquid metals

par Gregori, Giacomo ;Doneux, Thomas ;Lim, Jun
Référence Solid state sciences, 154, 107630
Publication Publié, 2024-07-15

Article révisé par les pairs

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Résumé :

Accurate determinations of the thermochemical properties for the steel alloying elements (Fe, Cr, Ni, Co and Mn)dissolved as corrosion product impurities in Pb and Pb–Bi alloy (LBE) are relevant for the development of Lead-Cooled Fast Nuclear Reactors (LFRs). Ion-selective solid electrolytes are suitable for an electrochemical characterizationof the dissolved impurities. Among these, ion-exchanged Ni-β”-Al2O3 and Fe-β”-Al2O3 are promisingsolid electrolytes for the selective detection of Ni and Fe dissolved in HLMs. In the present works we proposed apreliminary test of liquid and vapor ion-exchanges on commercial polycrystalline Na-β”-Al2O3 tubes at differentconditions of temperature and reaction time with NiCl2 and FeCl2 salts, characterizing the effects on the materialmicrostructure. The resulting Ni-Na-β”-Al2O3 and Fe-Na-β”-Al2O3 samples were only partially replaced by nickelor iron, extremely porous, damaged by molten salt corrosion, and contaminated by residual chlorides. Whentested as selective sensors in molten LBE, they failed in detecting dissolved nickel or iron. Thus, ion-exchangeprocedure on polycrystalline Na-β”-Al2O3 substrates still needs to be improved by properly combining theliquid and vapor ion-exchange with optimized reaction conditions in order to increase the sodium replacementyield. Alternatively, efforts may be focused on the preparation and application of other different nickel and ironsolid electrolytes.