Search Results - "Okuma, Gaku"

Morphology of subsurface cracks in glass-ceramics induced by Vickers indentation observed by synchrotron X-ray multiscale tomography by Okuma, Gaku, Maeda, Kei, Yoshida, Satoshi, Takeuchi, Akihisa, Wakai, Fumihiro

“…The characterization of subsurface cracks induced by indentation is a challenge for understanding contact damage, impact, wear, erosion, and abrasion of…”
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Sintering forces acting among particles during sintering by grain‐boundary/surface diffusion by Wakai, Fumihiro, Guillon, Olivier, Okuma, Gaku, Nishiyama, Norimasa

“…The microstructural evolution during sintering involves the formation and pinch‐off of pore channels. The sintering of 3 particles in 3 dimensions is a simple…”
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Microstructural evolution of electrodes in sintering of multi-layer ceramic capacitors (MLCC) observed by synchrotron X-ray nano-CT by Okuma, Gaku, Saito, Naoya, Mizuno, Kotaro, Iwazaki, Yoshiki, Kishi, Hiroshi, Takeuchi, Akihisa, Uesugi, Masayuki, Uesugi, Kentaro, Wakai, Fumihiro

“…Synchrotron X-ray nano computed tomography was used to investigate the microstructural evolution during co-sintering of multi-layer ceramic capacitors (MLCC)…”
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Micromechanics of formation and shrinkage of a closed pore in sintering by coupled grain boundary/surface diffusion by Wakai, Fumihiro, Okuma, Gaku, Nishiyama, Norimasa, Guillon, Olivier

“…The microscopic principle of the stress-assisted sintering is that the relative velocity between two adjoining particles is proportional to the sum of the…”
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Indentation‐induced ductile behavior of glass–ceramics involving layered aluminosilicates by Maeda, Kei, Okuma, Gaku, Yoshida, Satoshi, Wakai, Fumihiro, Takeuchi, Akihisa, Uesugi, Masayuki, Yanagioka, Shun, Matsunuma, Shun, Machida, Shingo, Yasumori, Atsuo

“…Contact damage in materials is critical in engineering applications because it influences mechanical resistance, such as wear, erosion, and impact failure…”
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Mechanical Properties of CaO–Al2O3–SiO2 Glass-Ceramics Precipitating Hexagonal CaAl2Si2O8 Crystals by Maeda, Kei, Akatsuka, Kosho, Okuma, Gaku, Yasumori, Atsuo

“…Fracture behavior via a flexural test for a newly found CaO–Al2O3–SiO2 (CAS) glass-ceramic (GC) was compared with that of enstatite GC and mica GC, which are…”
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Domain coarsening in viscous sintering as a result of topological pore evolution by Okuma, Gaku, Tanaka, Satoshi, Wakai, Fumihiro

“…•Domain coarsening is defined as the increase of mean intercept length with densification in sintering.•Decrease of surface area is the origin, as mean…”
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Investigation of the stability of NASICON-type solid electrolyte in neutral-alkaline aqueous solutions by Hou, Minjie, Qu, Tao, Zhang, Qingkai, Yaochun, Yao, Dai, Yongnian, Liang, Feng, Okuma, Gaku, Hayashi, Katsuro

“…[Display omitted] •Effects of solution with different pH values on stability of Na3Zr2Si2PO12 are studied.•Formation of new cracking surface resistance of…”
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Anisotropic microstructural evolution and coarsening in free sintering and constrained sintering of metal film by using FIB-SEM tomography by Okuma, Gaku, Miyaki, Ryo, Shinobe, Kan, Sciazko, Anna, Shimura, Takaaki, Yan, Zilin, Hara, Shotaro, Ogashiwa, Toshinori, Shikazono, Naoki, Wakai, Fumihiro

“…The anisotropic microstructure develops during powder processing and constrained sintering. FIB-SEM tomography was used to investigate the microstructural…”
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Heterogeneities and defects in powder compacts and sintered alumina bodies visualized by using the synchrotron X-ray CT by Okuma, Gaku, Osada, Toshio, Minagawa, Haruki, Arai, Yutaro, Inoue, Ryo, Kakisawa, Hideki, Shimoda, Kazuya, Takeuchi, Akihisa, Uesugi, Masayuki, Tanaka, Satoshi, Wakai, Fumihiro

“…The uniaxial die compaction and sintering is an important industrial production method for metal and ceramic components. While submicron- and nano-sized…”
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3D Visualization of Morphological Evolution of Large Defects during Spark Plasma Sintering of Alumina Granules by Okuma, Gaku, Endo, Masaya, Minagawa, Haruki, Inoue, Ryo, Kakisawa, Hideki, Kohata, Takuma, Osada, Toshio, Yamamoto, Takafumi, Azuma, Masaki, Takeuchi, Akihisa, Uesugi, Masayuki, Guillon, Olivier, Wakai, Fumihiro

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Comparison between sinter forging and X-ray microtomography methods for determining sintering stress and bulk viscosity by Okuma, Gaku, Gonzalez-Julian, Jesus, Guillon, Olivier, Wakai, Fumihiro

“…The macroscopic sintering parameters, sintering stress, bulk viscosity, and shear viscosity, were measured by the discontinuous sinter forging experiment for…”
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Computation of sintering stress and bulk viscosity from microtomographic images in viscous sintering of glass particles by Okuma, Gaku, Kadowaki, Daiki, Hondo, Tsuyoshi, Sato, Akihiro, Tanaka, Satoshi, Wakai, Fumihiro

“…Sintering stress and bulk viscosity were derived as functions of relative density from microtomographic images in viscous sintering of glass particles. Three…”
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Sintering mechanics of ceramics: a short review by Wakai, Fumihiro, Okuma, Gaku, Nishiyama, Norimasa

“…The strength and reliability of ceramics is determined by the microstructure and small defects, such as voids and cracks, which are often formed during…”
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Determination of sintering stress and bulk viscosity from sinter-forging and X-ray microtomography methods: a Review by Okuma, Gaku, Wakai, Fumihiro, Tanaka, Satoshi, Hondo, Tsuyoshi, Gonzalez-Julian, Jesus, Guillon, Olivier

“…Sintering stress and bulk viscosity for viscous sintering of glass were determined by two methods; sinter-forging and X-ray microtomography methods. Calcium…”
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Mechanical behaviours of reactive hot-pressed B4C-based composites with ZrB2-ZrC by Guo, Shuqi, Okuma, Gaku, Naito, Kimiyoshi, Kakisawa, Hideki

“…Three B4C-based composites with 10, 20 and 30 vol% ZrB2-ZrC were prepared by reactive hot-pressing of Zr and B4C powders at 1900°C for 2 h under 20 MPa in Ar…”
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Mechanical behaviours of hot-pressed rare-earth oxide (RE = Y and La)-doped TaB2-SiC composites by Guo, Shuqi, Okuma, Gaku, Naito, Kimiyoshi, Kakisawa, Hideki

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Corrigendum to “Modelling of elimination of strength-limiting defects by pressure-assisted sintering at low stress levels” [J. Eur. Ceram. Soc. 41 (2021) 202–210] by Wakai, Fumihiro, Okuma, Gaku, Mücke, Robert, Guillon, Olivier

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Synchrotron X‐ray multiscale tomography: Visualization of heterogeneous microstructures and defects in ceramics by Okuma, Gaku, Wakai, Fumihiro

“…Synchrotron X‐ray multiscale tomography is a three‐dimensional (3D) imaging method that combines microtomography and nanotomography to perform a high spatial…”
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Rigid body motion of multiple particles in solid-state sintering by Wakai, Fumihiro, Okuma, Gaku

“…The deep understanding of rigid body motion and shape change of multiple particles is required to predict the complicated microstructural evolution during…”
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