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Influence des conditions de synthèse sur les microstructures d'oxyde de cérium yttrié obtenu par voie oxalique

Abstract : The monitoring of dissolved oxygen in sodium of sodium fast reactors (SFR) can be performed via potentiometric sensors whith yttria doped thoria electrolyte. With the aim to install such sensors in the ASTRID SFR prototype, studies on yttria doped ceria were first conducted in order to check the feasibility of the process with a non-radioactive simulant material. This material is also studied for the solid oxide fuel cells. The material must exhibit high density and a fine grain microstructure to be resistant to the corrosion by liquid sodium and to the thermal shocks. Thus, the oxalic coprecipitation route was chosen to avoid milling steps that could bring impurity incorporation. Powder and sintered pellets were analyzed by BET, XRD and SEM. The results show that synthesis conditions are of first importance on the process yield, oxalate powder microstructure and eventually on the ceramic density and microstructure. In particular, pH and rate of product mixing are key parameters. The impurity content was limited by controlling the synthesis, calcination and sintering steps. These results will help in defining more precisely the process to elaborate yttria doped thoria in order to obtain the desired microstructures
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Submitted on : Monday, March 16, 2020 - 2:22:14 PM
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L. Brissonneau, A. Mathieu, Brigitte Tormos. Influence des conditions de synthèse sur les microstructures d'oxyde de cérium yttrié obtenu par voie oxalique. Récents Progrès en Génie des Procédés (Cédérom), 2015, 107. ⟨cea-02509096⟩



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