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Korean Journal of Metals and Materials > Volume 55(3); 2017 > Article
Korean Journal of Metals and Materials 2017;55(3): 184-190. doi: https://doi.org/10.3365/KJMM.2017.55.3.184
우라늄 분말 입자크기에 따른 Zr-U 금속연료의 성형 및 소결 미세조직의 영향
윤창근, 전현준, 주정환, 이호진, 이종탁, 김형래
한국원자력연구원
Compacted and Sintered Microstructure Depending on Uranium Powder Size in Zr-U Metallic Fuel
Chang Gun Yun, Hyun-Joon Jun, Jung Hwan Ju, Ho Jin Lee, Chong-Tak Lee, Hyung Lae Kim
Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
Correspondence  Hyung Lae Kim ,Tel: +82-2-2220-0407, Email: hlkim0904@kaeri.re.kr
Received: 18 August 2016;  Accepted: 22 September 2016.  Published online: 3 March 2017.
ABSTRACT
In case of the uranium (U) and zirconium (Zr) powders which have been utilized for the production of a metallic fuel in the various nuclear applications, the homogenous distribution of U powders in the Zr-U pellet has influenced significantly on the nuclear fuel performance. The inhomogeneity in a powder process was changed by various intricate factors, e.g. powder size, shape, distribution and so on. Particularly, the U inhomogeneity in the Zr-U pellets occurs by segregation derived from the great gaps of densities between Zr and U during compaction of the mixed powders. In this study, the relationship between powder size and homogeneity was investigated by using the different-sized U powders. The microstructure in Zr-U pellets reveals more homogeneity when the weight ration of Zr and U powders are close to 1. In addition, homogeneous pellets which were produced by fine U powders have higher density because the homogeneity affects the alloying reaction during sintering and the densification behavior of pore induced by powder size.
Keywords: powder size, powder processing, segregation, homogeneity, Zr-U
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