3D Visualization of Morphological Evolution of Large Defects during Spark Plasma Sintering of Alumina Granules
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- Gaku Okuma
- Research Center for Structural Materials National Institute for Materials Science (NIMS) Ibaraki 305-0047 Japan
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- Masaya Endo
- Laboratory for Materials and Structures Institute of Innovative Research Tokyo Institute of Technology Yokohama 226-8503 Japan
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- Haruki Minagawa
- Department of Mechanical Engineering Tokyo University of Science 6-3-1 Niijuku Katsushika-Ku Tokyo 125-8585 Japan
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- Ryo Inoue
- Department of Mechanical Engineering Tokyo University of Science 6-3-1 Niijuku Katsushika-Ku Tokyo 125-8585 Japan
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- Hideki Kakisawa
- Research Center for Structural Materials National Institute for Materials Science (NIMS) Ibaraki 305-0047 Japan
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- Takuma Kohata
- Research Center for Structural Materials National Institute for Materials Science (NIMS) Ibaraki 305-0047 Japan
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- Toshio Osada
- Research Center for Structural Materials National Institute for Materials Science (NIMS) Ibaraki 305-0047 Japan
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- Takafumi Yamamoto
- Laboratory for Materials and Structures Institute of Innovative Research Tokyo Institute of Technology Yokohama 226-8503 Japan
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- Masaki Azuma
- Laboratory for Materials and Structures Institute of Innovative Research Tokyo Institute of Technology Yokohama 226-8503 Japan
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- Akihisa Takeuchi
- Japan Synchrotron Radiation Research Institute JASRI/SPring-8, Kouto 1-1-1 Sayo Hyogo 679-5198 Japan
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- Masayuki Uesugi
- Japan Synchrotron Radiation Research Institute JASRI/SPring-8, Kouto 1-1-1 Sayo Hyogo 679-5198 Japan
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- Olivier Guillon
- Institute of Energy and Climate Research IEK-1: Materials Synthesis and Processing Forschungszentrum Jülich GmbH D-52425 Jülich Germany
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- Fumihiro Wakai
- Research Center for Structural Materials National Institute for Materials Science (NIMS) Ibaraki 305-0047 Japan
抄録
<jats:sec><jats:label /><jats:p>The mechanical reliability of products must be assured for scaling up and production of complex‐shaped components by spark plasma sintering (SPS) of spray‐dried granules. The evolution of morphologies of pores and defects, which control the mechanical strength, is investigated by using synchrotron X‐ray multiscale tomography during SPS of alumina granules at 1300 °C. While large defects arising from the hierarchical granule packing structure cannot be removed by pressureless sintering, crack‐like defects and branched rodlike defects are almost eliminated by SPS at stresses higher than 30 and 50 MPa, respectively. But, small ellipsoidal porous regions, which may arise from aggregates or dimples of granules, cannot be removed even at a pressure of 50 MPa. A very large defect is also found by using micro‐CT. It is supposed that this defect is formed from a large void in loosely packed granules. The shrinkage of large voids and the elimination of crack‐like defects are explained by the theoretical prediction based on the continuum theory of sintering.</jats:p></jats:sec>
収録刊行物
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- Advanced Engineering Materials
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Advanced Engineering Materials 25 (18), 2023-03
Wiley
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詳細情報 詳細情報について
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- CRID
- 1360580229789879040
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- ISSN
- 15272648
- 14381656
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- データソース種別
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- Crossref
- KAKEN