Solid State Processing of Massive Uranium Mononitride, Using Uranium and Uranium Higher Nitride Powders as Starting Materials; PREPARATION A L'ETAT SOLIDE DE MONONITRURE D'URANIUM MASSIF A PARTIR DE POUDRES D'URANIUM ET DE NITRURES SUPERIEURS D'URANIUM
Thesis/Dissertation
·
OSTI ID:4782153
Thesis submitted to Universite, Paris. The mechanism and the optimum conditions for preparing UN were studied. The resuits were used for hot pressing (250 kg/cm/, l000 deg C, under vacuum) a mixture of powders of U and higher U nitrides. The products obtained were identified by x-ray measurements and may be either UN, or alpha U-UN depending on conditions. As revealed by the curved shape of grain boundaries, the sinters obtained do not easily evolve toward physico-chemical equilabrium when submitted to heat treatment. This behavior is quite different from the one observed with UN prepared by a similar method. This fact may be ascribed to the insolubility in the matrix UN of particles of UO/ being present as impurities. The density, hardness, and thermal conductivity of these products are higher than those measured on UN or U-UN cermets obtained by other methods. (auth)
- Research Organization:
- France. Commissariat a l'Energie Atomique. Centre d'Etudes Nucleaires, Saclay
- NSA Number:
- NSA-16-016452
- OSTI ID:
- 4782153
- Report Number(s):
- CEA-2103
- Country of Publication:
- France
- Language:
- English
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