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and EuAlNakamura, Ai*; Hiranaka, Yuichi*; Hedo, Masato*; Nakama, Takao*; Miura, Yasunao*; Tsutsumi, Hiroki*; Mori, Akinobu*; Ishida, Kazuhiro*; Mitamura, Katsuya*; Hirose, Yusuke*; et al.
JPS Conference Proceedings (Internet), 3, p.011012_1 - 011012_6, 2014/06
Nakamura, Ai*; Hiranaka, Yuichi*; Hedo, Masato*; Nakama, Takao*; Miura, Yasunao*; Tsutsumi, Hiroki*; Mori, Akinobu*; Ishida, Kazuhiro*; Mitamura, Katsuya*; Hirose, Yusuke*; et al.
Journal of the Physical Society of Japan, 82(10), p.104703_1 - 104703_10, 2013/10
Times Cited Count：34 Percentile：82.04(Physics, Multidisciplinary)Aihara, Jun; Ueta, Shohei; Yasuda, Atsushi*; Takeuchi, Hitoshi*; Mozumi, Yasuhiro*; Sawa, Kazuhiro; Motohashi, Yoshinobu*
Materials Transactions, 50(11), p.2631 - 2636, 2009/11
Times Cited Count：8 Percentile：45.79(Materials Science, Multidisciplinary)The ZrC coating layer has been fabricated using the bromide process at JAEA. The coated particles with IPyC layers reported in a previous study were annealed at around 1800
C for 1h, under which compact sintering will be done in a practical process, in order to study effects of the heat treatment (annealing) on their microstructure evolution. Then the microstructures of the ZrC layers in the cases (batches) of C/Zr = 1.11 and 1.35 were characterized by means of TEM and STEM. Certain changes in the shape and size of voids or free carbons region caused by the heat treatment were found in the cases of both batches. After the heat treatment, the voids or free carbons region have shown a clod like feature with diameters of 50 to 100 nm. The grain growth of ZrC was also observed in both cases: In the ZrC layer with C/Zr = 1.11, the fibrous carbons grew as of to stand from the PyC to ZrC layers on some places in the IPyC/ZrC boundary.
Yasuda, Atsushi; Ueta, Shohei; Aihara, Jun; Takeuchi, Hitoshi; Sawa, Kazuhiro
JAEA-Technology 2008-073, 18 Pages, 2008/11
JAEA-Technology-2008-073.pdf:3.81MB
As the conventional SiC-coated fuel particle, the ZrC-coated particle is proposed as a nuclear fuel for the Very High Temperature Reactor (VHTR) which is one of Generation IV nuclear reactors. Therefore it is examined by ZrC-coating equipment to get a ZrC-coating condition of C/Zr ratio 1.0, e.g., Zr and C atomic ratio equal to 1:1. Raw materials as surrogated kernel are Stabilized Zirconium Oxide (SZR) particle and PyC-coated SZR particle. For getting the basic production technology for mass production, the ZrC-coating parametric exanimation (coating gas flow rate, coating temperature and so on) is done up to 100 g as the equipment inventory. As the result of parameter examination, finally it could make the ZrC-coated particle with a thickness of ZrC layer of 0.030 mm and high quality in quantity of the particle inventory 100 g.
Al insert coilTakeuchi, Kazuhiro*; *; *; Asano, Katsuhiko*; Koizumi, Norikiyo; Ando, Toshinari; *; Tsuji, Hiroshi; Okuno, Kiyoshi
Proc. of 15th Int. Conf. on Magnet Technology (MT-15), p.417 - 420, 1997/00
no abstracts in English
Tobita, Kenji; Kusama, Yoshinori; Nemoto, Masahiro; Takeuchi, Hiroshi; Ito, Takao; Tsukahara, Yoshimitsu; Shitomi, Morimasa; Watanabe, Kazuhiro; Ohara, Yoshihiro
Kaku Yugo Kenkyu, 59(SPECIAL ISSUE), p.139 - 156, 1988/00
no abstracts in English
Yonemura, Masao*; Kamiyama, Takashi*; Ishigaki, Toru; Mori, Kazuhiro*; Harjo, S.; Iwase, Kenji*; Takeuchi, Yoji*; Sasaki, Tsuyoshi*; Ukyo, Yoshio*
no journal, ,
The layered rock-salt structural materials, LiMO
(M=Ni, Co, etc.) are promising candidates as cathodes in rechargeable lithium-ion batteries. These materials are defective in their electrochemical properties because their structures and thermal propertiesare unstable during the lithium (de)intercalation process. However, the substituted Li(Ni,Co,Al)O system shows the good electrochemical and thermal properties. The Mg doped system, Li(M,Mg)O, also shows good cycle stabilities. In this study, the effect of Mg doping into the Li(Ni,Co,Al,Mg)O system was studied with Mg compositions between 0 
Mg 0.1. In this presentation, the detailed structure will be discussed.
Aihara, Jun; Ueta, Shohei; Yasuda, Atsushi; Takeuchi, Hitoshi; Sawa, Kazuhiro; Motohashi, Yoshinobu*
no journal, ,
We report in this study the microstructural change of the ZrC coating layers with annealing. We already reported the microstructures of as-fabricated ZrC coating layers last year. ZrC coated particles were annealed at about 1800 C for 1 hour to simulate the sintering process of the real HTGR fuel. With annealing, ZrC grains were slightly grown especially near the surface regions and kept their orientation. The free carbons and/or voids cohered at the grain boundaries. The cohered free carbons and/or voids were appeared to form the clods of the free carbon ribbons. In addition, IPyC/ZrC boundary structure changed. Fibrous carbon texture was found at IPyC/ZrC boundary even in the specimen of the batch of which that texture was not observed in the as-fabricated specimen.
Tanaka, Yasuharu*; Goto, Kazuyuki*; Miyagawa, Kimio*; Kiho, Kenzo*; Tsukuda, Kazuhiro*; Hama, Katsuhiro; Takeuchi, Ryuji; Morikawa, Keita; Yuguchi, Takashi
no journal, ,
no abstracts in English
Sano, Yuichi; Sakamoto, Atsushi; Takeuchi, Masayuki; Suzuki, Hideya*; Matsumura, Tatsuro; Kawanobe, Kazunori*; Asano, Shusaku*; Maki, Taisuke*; Mae, Kazuhiro*
no journal, ,
The mass transfer coefficients during the extraction and back-extraction of lanthanide elements in the solvent extraction process using new extractants (TDdDGA, HONTA) developed for minor actinides (MA) recovery were evaluated. In the TDdDGA system, it was confirmed that the mass transfer coefficients during back extraction were improved by the addition of alcohol to the solvent, etc., and in the HONTA system, the mass transfer coefficients were relatively small.
