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Dilatometric study of a co-converted (U,Am)O2 powder

Abstract : A possible option to reduce the radiotoxicity of nuclear waste is to transmute minor actinides and notably americium into lighter short-lived elements in fast neutron reactors of fourth generation. It consists in irradiating uranium–americium mixed-oxide compounds named AmBB (Americium-Bearing Blankets) and located at the reactor core periphery. Among the processes developed to fabricate AmBB, a chemical synthesis route was investigated. Dense samples were achieved using a simplified pelletizing-sintering process from oxalate co-converted powder. This work focuses on the identification and comprehension of the steps occurring during the sintering of these co-converted (U,Am)O2 powders. To discriminate the different phenomena observed by dilatometric measurements, different experimental techniques were performed. It allowed identifying that the sintering of the finest particles occurred in the [1000–1350 K] range while the elimination of porosity and sintering of (U,Am)O2 larger grains is realized in the [1400–1900 K] range with an apparent activation energy of 430 kJ.mol−1.
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Submitted on : Friday, November 29, 2019 - 3:35:21 PM
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L. Ramond, D. Horlait, T. Delahaye, G. Jouan, A. Gauthé, et al.. Dilatometric study of a co-converted (U,Am)O2 powder. Journal of the European Ceramic Society, Elsevier, 2016, 36 (7), pp.1775-1782. ⟨10.1016/j.jeurceramsoc.2016.01.028⟩. ⟨cea-02387045⟩



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