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AbstractAbstract
[en] The mechanism and the optimum conditions for preparing uranium mononitride have been studied. The results have been used for hot pressing (250 kg/cm2, 1000 deg. C, under vacuum) a mixture of powders of uranium and uranium higher nitrides. The products obtained have been identified by X-ray measurements and may be - at will and depending upon the stoichiometry - either UN, or a cermet a Uα-UN. As revealed by the curved shape of grain boundaries, the sinters obtained here do not easily evolve towards physico-chemical equilibrium when submitted to heat treatment. This behaviour is quite different from the one observed with uranium monocarbide prepared by a similar method. This fact may be ascribed to the insolubility in the matrix UN of particles of UO2 being present as impurities. The density, hardness and thermal conductivity of these products are higher than those measured on uranium nitride or cermets U-UN obtained by other methods. (author)
[fr]
Apres une etude prealable du mecanisme et des conditions optimales de nitruration de l'uranium, on a montre qu'il est possible de preparer par frittage sous charge (250 kg/cm2, 1000 deg. C sous vide) d'un melange de poudres d'uranium et de nitrures superieurs d'uranium, un produit qui a ete identifie par diffraction de rayons X. On peut ainsi obtenir a volonte, soit le monocarbure UN, soit un cermet Uα-UN dans le cas de compositions sous-stoechiometriques. Au contraire du monocarbure d'uranium prepare dans des conditions analogues, les produits obtenus ici, soumis a un traitement thermique, n'evoluent pas facilement vers un etat d'equilibre physico-chimique caracterise par l'existence de joints de grains rectilignes. On attribue ce phenomene a l'insolubilite de l'impurete UO2 dans UN. La densite, la durete, la conductibilite thermique de ces produits se revelent superieures a celles des nitrures d'uranium ou des cermets U-UN obtenus par les autres methodes. (auteur)Original Title
Preparation a l'etat solide de mononitrure d'uranium massif a partir de poudres d'uranium et de nitrures superieurs d'uranium (1962)
Primary Subject
Source
Dec 1960; 58 p; 12 refs.; These metallurgie speciale
Record Type
Report
Literature Type
Thesis/Dissertation
Report Number
Country of publication
ACTINIDE COMPOUNDS, CARBIDES, CARBON COMPOUNDS, COHERENT SCATTERING, COMPOSITE MATERIALS, DIFFRACTION, FABRICATION, HEAT TREATMENTS, MATERIALS, MATERIALS WORKING, MECHANICAL PROPERTIES, MICROSTRUCTURE, NITRIDES, NITROGEN COMPOUNDS, PHYSICAL PROPERTIES, PNICTIDES, SCATTERING, THERMODYNAMIC PROPERTIES, URANIUM COMPOUNDS
Reference NumberReference Number
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