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[ $(Th,U)O_2$ ] Pellets: Fabrication and Thermal Properties  

Kang Ki Won (Korea Atomic Energy Research Institute)
Yang Jae Ho (Korea Atomic Energy Research Institute)
Kim Keon Sik (Korea Atomic Energy Research Institute)
Song Kun Woo (Korea Atomic Energy Research Institute)
Lee Chan Bock (Korea Atomic Energy Research Institute)
Jung Youn Ho (Korea Atomic Energy Research Institute)
Publication Information
Nuclear Engineering and Technology / v.35, no.4, 2003 , pp. 299-308 More about this Journal
Abstract
Fabrication technique of $(Th,U)O_2$ pellets has been investigated. Powder mixtures of $ThO_2\;and\;UO_2$ were milled in two different ways-dry and wet milling. Milled powder was compacted and sintered to $(Th,U)O_2$ pellets. The wet-milled powder leads to a $(Th,U)O_2$ pellet having a high sintered density and uniform distribution of U and Th, compared to the dry-milled powder. The sintered density of a $(Th,U)O_2$ pellet tends to decrease by increasing the content of $ThO_2$. The thermal conductivity of $ThO_2\;and\;(Th,U)O_2$ pellets was measured by the laser flash method. The thermal conductivity of the $ThO_2$ pellet is higher than that of the $UO_2$ pellet, and the thermal conductivities of $(Th,U)O_2$ pellets containing $65wt\%\;and\;35wt\%\;ThO_2$ pellets are lower than that of the $UO_2$ pellet.
Keywords
wet and dry-milled powder; thermal conductivity; sintered density;
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