The Sintering Mixed Powders Behavior of Triuranium Octoxide in Uranium Dioxide

Aurica Barbu; Mihai Ovidiu Cojocaru

doi:10.4028/www.scientific.net/AMR.1114.22

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1114The Sintering Mixed Powders Behavior of Triuranium...

The Sintering Mixed Powders Behavior of Triuranium Octoxide in Uranium Dioxide

Abstract:

The main aim of this research was to study the sintering behavior in hydrogen atmosphere of mixed powders of triuranium octoxide (U₃O₈) powder in dioxide uranium (UO₂) powders. By cold pressing the green pellets of mixed powders of triuranium octoxide in hyper stoichiometric uranium dioxide has density over 40 % UO₂ theoretical density (TD). The sintered pellets had a height diameter ratio (H / D) over one and oxygen uranium ratio (O/U) near stoichiometry of uranium dioxide (UO₂). The densities of sintered pellets were up to 97% of uranium dioxide theoretical density. The proposed treatment of sintering are function of green pellets density. Increasing the proportion of triuranium octoxide leads to a decrease in the density of the sinter pellets. The pellets made by 100 % of triuranium octoxide not resist to proposed sintering treatment. The metallographic analysis show uniform grains for sinter pellets made by the 30 % mixture of triuranium octoxide in uranium dioxide. This UO₂ sinter pellets are without surface defects.

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Advanced Materials Research (Volume 1114)

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22-28

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https://doi.org/10.4028/www.scientific.net/AMR.1114.22

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Online since:

July 2015

Authors:

Aurica Barbu*, Mihai Ovidiu Cojocaru

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Pellet, Powder, Sintering, Uranium Oxides

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