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Microstructural Analysis on $UO_2$ and $UO_2$-4wt% $CeO_2$ by Using Additives in Reducing and Oxidizing Atmospheres

Kim, Han-Soo   (Korea Atomic Energy Research InstituteCC0186830  ); Kim, Si-Hyung   (Korea Atomic Energy Research InstituteCC0186830  ); Lee, Young-Woo   (Korea Atomic Energy Research InstituteCC0186830  ); Na, Sang-Ho   (Korea Atomic Energy Research InstituteCC0186830  );
  • 초록

    The effects of dopants on the modification of microstructure of UO $_2$ and UO $_2$ -4wt%CeO $_2$ sintered pellets have been studied in hydrogen and $CO_2$ /CO mixture atmospheres by using $Ta_2O_5$ , TiO $_2$ and $Nb_2O_5$ as sintering additives. The dopant were added as oxide powders and homogenized by attrition milling. The mixed powders were pressed, and then sintered in hydrogen at 1 $700^{\circ}C$ , or in oxidizing atmosphere using Controlled $CO_2$ /CO mixtures at 125 $0^{\circ}C$ . Both density and microstructure of UO $_2$ are modified by the addition of dopants in reducing atmosphere. The sintered density is increased with $Ta_2O_5$ addition up to 0.33wt% and subsequently decreased with higher content of the additive. The effect on the densification and the gain growth are apparent with the addition of 0.24wt% $Nb_2O_5$ . With 0.lwt% titania and 0.6wt% $Ta_2O_5$ , the sintered density is decreased, but the grain size is increased. In oxidizing atmosphere, the grain sizes for UO $_2$ doped with the above additives are smaller than that for pure UO $_2$ . The grain size of Ta or Nb-doped UO $_2$ is decreased with increasing $CO_2$ /CO ratio, but that of pure UO $_2$ or T-doped UO $_2$ is increased. A large portion of second phases is observed in UO $_2$ doped with 0.lwt% TiO $_2$ sintered in hydrogen atmosphere, while, in $CO_2$ /CO atmospheres, the second phases or dopant agglomerates are not observed. For UO $_2$ -4wt%CeO $_2$ mixed oxide, the effect of additives on the gain growth is not so much as that for the pure UO $_2$ . This is attributed to the formation of clusters by dopant cations and Ce ions, so that the additives contribute to a lesser exent to the grain growth for the mixed oxide.


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