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下記のとおり令和8年9月博士課程修了予定者論文発表会（原子核工学コース）を行います。
プログラム
6月16日（火）
会場：ゼロカーボンエネルギー研究所 北2号館6階会議室
| 開始時刻／ 終了時刻 |
発表者氏名 | 指導教員 | 論文題目 |
|---|---|---|---|
| 13：00／ 15：00 |
吉田 アリン IGP-(A) |
吉田 克己 | Sintering mechanisms and kinetics of SiC ceramics with B and C additives under induction heating |
| Silicon carbide (SiC) is a promising material for nuclear fission and fusion systems because of its excellent mechanical properties, high thermal conductivity, chemical stability, and superior resistance to high-temperature and irradiation environments. However, the sintering of SiC ceramics is generally difficult because of the strong covalent bonding and low self-diffusion coefficient of SiC. To improve the efficiency of the sintering of SiC ceramics, induction heating was introduced as a new sintering technique with several advantages such as high heating rate. Nevertheless, the understanding of the sintering mechanisms and kinetics of SiC under induction heating conditions is still limited. In this study, the densification behavior, grain growth kinetics, and polytype transformation of SiC during induction heating sintering were systematically investigated. In addition, particular attention is focused on the stage-dependent behavior during sintering under induction heating to elucidate the roles of B and C additives, the influence of rapid induction heating and polytype transformation on the sintering behavior of SiC. Through kinetic analysis and microstructural observations, the mechanisms governing the sintering of SiC under induction heating were discussed. The findings obtained in this study provide important understanding for controlling microstructure evolution and optimizing induction heating sintering processes for SiC ceramics. | |||
6月26日（金）
会場：ゼロカーボンエネルギー研究所 北1号館1階会議室
| 開始時刻／ 終了時刻 |
発表者氏名 | 指導教員 | 論文題目 |
|---|---|---|---|
| 10：00／ 12：00 |
Chen Yuan IGP-(C) |
木倉 宏成 | Fundamental Study on the Nuclear Reactor Interior Detection Method using Laser and Ultrasound |
| Following the Fukushima Daiichi nuclear accident, the investigation and retrieval of fuel debris have become one of the most important challenges in nuclear reactor decommissioning. However, the interior of damaged reactors is characterized by strong radiation, limited accessibility, water, mist, and low visibility, making conventional measurement methods difficult to apply. This study investigates an integrated measurement method combining laser-induced breakdown spectroscopy (LIBS) and ultrasonic techniques for complex nuclear reactor environments. For elemental analysis, a microchip-LIBS probe with environmental adaptability was developed. The probe structure was optimized for operation in air and underwater environments, and its feasibility for remote elemental measurement was experimentally verified. For shape measurement, a motion-based ultrasonic measurement method was proposed to improve the spatial resolution and measurement accuracy limited by wide ultrasonic beams in conventional TOF methods. In addition, ultrasonic velocity profiling (UVP) based on the Doppler effect was applied to narrow gap flow measurement and leakage monitoring. By integrating LIBS and ultrasonic techniques, a multimodal measurement system capable of simultaneously obtaining elemental, shape, and flow information was constructed. Experimental results demonstrated the feasibility of the proposed system for fuel debris investigation and complex environment measurement in nuclear reactor decommissioning applications. | |||
7月2日（木）
会場：ゼロカーボンエネルギー研究所 北1号館1階会議室
| 開始時刻／ 終了時刻 |
発表者氏名 | 指導教員 | 論文題目 |
|---|---|---|---|
| 10：00／ 12：00 |
Weirong Yang IGP-(A) |
安井 伸太郎 | Study on Titanite-based Antiferroelectric Thin Films for Energy Storage Application |
| This thesis investigates the fabrication, structural optimization, and energy-storage properties of titanite-type oxide thin films as a novel lead-free, non-perovskite platform for electrostatic capacitors. Titanite oxides exhibit a unique one-dimensional antiferroelectric ordering distinct from conventional perovskites. First, the study successfully fabricated (011)-oriented CaTiSiO5 thin films via pulsed laser deposition. With oxygen post-annealing to reduce leakage current, a clear room-temperature double P-E hysteresis loop was observed for the first time, achieving a recoverable energy density of 3.5 J/cm3 and 90% efficiency. Second, Ge substitution was explored to enhance polarization. Stoichiometric CaTiGeO5 films increased the relative permittivity to approximately 100, but revealed a trade-off with reduced breakdown strength, yielding a lower energy density of 2 J/cm3. Finally, Sr-doped CaTiSiO5 thin films were evaluated to balance dielectric performance and temperature stability. The Ca0.9Sr0.1TiSiO5 film demonstrated the best overall performance, delivering an enhanced energy density of 4.5 J/cm3, 90% efficiency, and a near-zero temperature coefficient of capacitance from 300 to 500 K. In summary, this work establishes compositional engineering in titanite thin films as a highly effective strategy for developing high-efficiency, lead-free energy-storage materials. | |||
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- 吉田 克己 教授 ： k-yoshida(at)zc.iir.titech.ac.jp
- 木倉 宏成 准教授 ： kikura(at)zc.iir.titech.ac.jp
- 安井 伸太郎 准教授 ： yasui(at)zc.iir.titech.ac.jp
更新日：2026.06.09
