Papers - TAKAHASHI Takuma
about 19-
Effects of rare-earth oxides on grain boundary strength of silicon nitride ceramics
K. Matsuura, T, Ohji, T. Takahashi, M. Iijima, J. Tatami
Journal of the European Ceramic Society 44 ( 14 ) 116672 2024.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Single Work
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Deformation Behavior and Fracture Strength of Single‐Crystal 4H‐SiC Determined by Microcantilever Bending Tests
Tsukaho Yahagi, Tatsuki Ohji, Hiroshi Yamaguchi, Takuma Takahashi, Hiromi Nakano, Motoyuki Iijima, … Show more authors
Tsukaho Yahagi, Tatsuki Ohji, Hiroshi Yamaguchi, Takuma Takahashi, Hiromi Nakano, Motoyuki Iijima, Junichi Tatami Hide authors
Advanced Engineering Materials 2024.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Scintillation properties of transparent Lu-α-SiAlON:Ce<SUP>3+</SUP> ceramics
Aminaka, K; Tatami, J; Iijima, M; Ito, A; Matsumoto, S; Takahashi, T; Ohji, T
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY 21 ( 4 ) 2671 - 2677 2024.4
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Deformation behavior and bending strength of single crystal 8 mol% yttria-stabilized zirconia at microscopic scale
Mayuko Muramoto, Junichi Tatami, Motoyuki Iijima, Kazumi Matsui, Tsukaho Yahagi, Takuma Takahashi, … Show more authors
Mayuko Muramoto, Junichi Tatami, Motoyuki Iijima, Kazumi Matsui, Tsukaho Yahagi, Takuma Takahashi, Hiromi Nakano, Tatsuki Ohji Hide authors
Journal of the European Ceramic Society ( 2 ) 1061 2024.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Effects of Inorganic Binder on Dewaxing Behavior of Alumina Green Body
Minami Mariko, Tatami Junichi, Iijima Motoyuki, Takahashi Takuma
Journal of the Society of Powder Technology, Japan 60 ( 9 ) 542 - 546 2023.9 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Powder Technology, Japan Joint Work
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Drying Process of Particle Suspension by OCT Operando Observation
TAKAHASHI Takuma
Hosokawa Powder Technology Foundation ANNUAL REPORT 30 ( 0 ) 65 - 71 2023.5
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Hosokawa Powder Technology Foundation Single Work
<p>The particle aggregate structure formed during drying is desired strongly to control elaborately and flexibly in products and manufacturing processes using particle suspensions, because it is critical to the final performances. However, a direct understanding of the phenomenon under the actual environment is difficult due to the complexity of various factors that affect each other. To solve this issue, an operando observation system that can simultaneously measure the drying characteristics curves, which is the standard-scale of materials, and observe the internal structural changes was constructed in this study. The system consists of a swept-source optical coherence tomography (SS-OCT) for observation, an electronic balance for measuring weight change, and a probe for measuring environmental temperature and humidity change. The drying behavior of coffee droplets and Al<sub>2</sub>O<sub>3</sub> slurry was observed using this system, and it was found that the internal structural changes during drying could be directly correlated with the drying characteristics and evaluated quantitatively. Furthermore, the influences of solid concentration and particle dispersion/agglomeration in Al<sub>2</sub>O<sub>3</sub> slurry on the internal structure change and drying characteristics were also clarified.</p>
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In-situ investigation on crack-initiation and deformation of Al2O3 green bodies during dewaxing process by combined OCT-TG-FTIR and TMA
Minami Mariko, Tatami Junichi, Iijima Motoyuki, Takahashi Takuma, Ohji Tatsuki
CERAMICS INTERNATIONAL 49 ( 10 ) 15387 - 15394 2023.5 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Deformation behaviors and fracture strength of β-Si3N4 single crystals
Mami Tanabe, Junichi Tatami, Motoyuki Iijima, Tsukaho Yahagi, Takuma Takahashi, Hiromi Nakano, Tats … Show more authors
Mami Tanabe, Junichi Tatami, Motoyuki Iijima, Tsukaho Yahagi, Takuma Takahashi, Hiromi Nakano, Tatsuki Ohji Hide authors
Journal of the American Ceramic Society 106 ( 9 ) 5431 - 5439 2023.4 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Kuroda Hiromasa, Tatami Junichi, Iijima Motoyuki, Takahashi Takuma
大日本窯業協會雑誌 131 ( 3 ) 37 - 41 2023.3 [Reviewed]
DOI Web of Science CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人 日本セラミックス協会 Joint Work
<p>In the wet forming of ceramics, it is critical to control the cracking and deformation of the ceramic slurry during the drying process. This necessitates a comprehensive understanding of the changes in the internal structure of the slurry during the drying process using a high-resolution technique that enables direct and high speed observation. In this study, a combined system of optical coherence tomography (OCT) and thermogravimetry (TG) was developed for the <i>operando</i> observation of the evolution of the internal structure of a drying SiO<sub>2</sub> slurry. In the early stages of drying, the OCT signal intensity changed significantly owing to the Brownian motion of the SiO<sub>2</sub> particles in the slurry. The slurry was found to shrink as it dried and then lose its fluidity, and the ceramic particles were found to agglomerate from the surface. In the final stages of drying, localized dry regions developed in the vicinity of the slurry surface and expanded with drying. Crack formation was also observed in a part of the localized dry regions. Therefore, crack formation was attributed to inhomogeneous drying-induced shrinkage and stress generated in the drying object during the progression of localized drying. The novel <i>operando</i> observation technique using combined OCT-TG is successfully demonstrated to be an effective approach for understanding the internal structural changes in opaque slurries during their drying.</p>
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Effect of rare-earth oxide additives on transparency and fluorescence of a-SiAlON ceramics
Aminaka Kohei, Tatami Junichi, Iijima Motoyuki, Takahashi Takuma, Yahagi Tsukaho
CERAMICS INTERNATIONAL 48 ( 16 ) 23195 - 23205 2022.8 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Transparency and Photoluminescence of Gas-Pressure Sintered Lu-alpha-SiAlON:Ce3+ Ceramics
Aminaka Kohei, Tatami Junichi, Iijima Motoyuki, Takahashi Takuma
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY 11 ( 7 ) 2022.7 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Takahashi Takuma, Sakamoto Fumika, Tatami Junichi, Iijima Motoyuki
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY 19 ( 2 ) 1171 - 1179 2022.3 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Electrical resistivity of Si3N4 ceramics with Yb2O3 additive
Yahagi Tsukaho, Kawai Daisuke, Takahashi Takuma, Iijima Motoyuki, Tatami Junichi
JOURNAL OF THE AMERICAN CERAMIC SOCIETY 105 ( 3 ) 2046 - 2057 2022.3 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Transparent Y-alpha SiAlON:Ce3+ Ceramics Fabricated by Low-Temperature Liquid Phase Sintering Technique
Takahashi Takuma, Sano Yuki, Tatami Junichi, Iijima Motoyuki, Yokouchi Masahiro
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY 10 ( 8 ) 2021.8 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Room-temperature densification of MgO bulk ceramics with dispersed nitride phosphor particles
Takahashi Emi, Takahashi Takuma, Tatami Junichi
CERAMICS INTERNATIONAL 47 ( 4 ) 5013 - 5018 2021.2 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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TAKAHASHI Takuma, TATAMI Junichi
Journal of the Japan Society of Powder and Powder Metallurgy 67 ( 11 ) 615 - 620 2020.11 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Powder and Powder Metallurgy Joint Work
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Relationship between bending strength of bulk porous silicon carbide ceramics and grain boundary strength measured using microcantilever beam specimens
Tatami Junichi, Imoto Yumi, Yahagi Tsukaho, Takahashi Takuma, Iijima Motoyuki
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 40 ( 7 ) 2634 - 2641 2020.7 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Dislocation-controlled microscopic mechanical phenomena in single crystal silicon under bending stress at room temperature
Yamaguchi Hiroshi, Tatami Junichi, Yahagi Tsukaho, Nakano Hiromi, Iijima Motoyuki, Takahashi Takuma … Show more authors
Yamaguchi Hiroshi, Tatami Junichi, Yahagi Tsukaho, Nakano Hiromi, Iijima Motoyuki, Takahashi Takuma, Kondo Toshiyuki Hide authors
JOURNAL OF MATERIALS SCIENCE 55 ( 17 ) 7359 - 7372 2020.6 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Preparation of Nitride Phosphor Particle Dispersed h-BN/Glass Composites
Torase Natsumi, Tatami Junichi, Iijima Motoyuki, Takahashi Takuma
Journal of the Society of Powder Technology, Japan 57 ( 3 ) 137 - 143 2020.3
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Powder Technology, Japan Joint Work