[HTML][HTML] Mechanical Properties of CaO–Al2O3–SiO2 Glass-Ceramics Precipitating Hexagonal CaAl2Si2O8 Crystals

K Maeda, K Akatsuka, G Okuma, A Yasumori - Crystals, 2021 - mdpi.com
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 well-known …

Recent progress in synchrotron radiation 3D–4D nano-imaging based on X-ray full-field microscopy

A Takeuchi, Y Suzuki - Microscopy, 2020 - academic.oup.com
The advent of high-flux, high-brilliance synchrotron radiation (SR) has prompted the
development of high-resolution X-ray imaging techniques such as full-field microscopy …

Morphology of subsurface cracks in glass-ceramics induced by Vickers indentation observed by synchrotron X-ray multiscale tomography

G Okuma, K Maeda, S Yoshida, A Takeuchi, F Wakai - Scientific reports, 2022 - nature.com
The characterization of subsurface cracks induced by indentation is a challenge for
understanding contact damage, impact, wear, erosion, and abrasion of brittle materials …

[HTML][HTML] Microstructural evolution of electrodes in sintering of multi-layer ceramic capacitors (MLCC) observed by synchrotron X-ray nano-CT

G Okuma, N Saito, K Mizuno, Y Iwazaki, H Kishi… - Acta Materialia, 2021 - Elsevier
Synchrotron X-ray nano computed tomography was used to investigate the microstructural
evolution during co-sintering of multi-layer ceramic capacitors (MLCC) consisting of Ni …

In-situ 3D X-ray investigation of ceramic powder sintering at the particle length-scale

AM Venkatesh, D Bouvard, P Lhuissier, J Villanova… - Ceramics …, 2024 - Elsevier
We report an in-situ investigation of a high-temperature ceramic powder sintering performed
for the first time at the particle length-scale. This was made possible by the phase-contrast X …

Near-room-temperature water-mediated densification of bulk van der Waals materials from their nanosheets

J Zhu, F Li, YZ Hou, H Li, D Xu, J Tan, J Du, S Wang… - Nature Materials, 2024 - nature.com
The conventional fabrication of bulk van der Waals (vdW) materials requires a temperature
above 1,000° C to sinter from the corresponding particulates. Here we report the near-room …

[HTML][HTML] Formation and evolution mechanisms of micropores in powder metallurgy Ti alloys

K Pan, X Liu, S Wu, S Gao, B Wang, M Sun, N Li - Materials & Design, 2022 - Elsevier
Mechanical properties and thermal deformation capabilities of powder metallurgy (P/M) Ti
alloys are extremely susceptible to pores in the sintered parts. However, deciphering the …

[HTML][HTML] Heterogeneities and defects in powder compacts and sintered alumina bodies visualized by using the synchrotron X-ray CT

G Okuma, T Osada, H Minagawa, Y Arai… - Journal of the European …, 2023 - Elsevier
The uniaxial die compaction and sintering is an important industrial production method for
metal and ceramic components. While submicron-and nano-sized powders are finding …

A novel method for estimating subresolution porosity from CT images and its application to homogeneity evaluation of porous media

L Zhuang, HS Shin, S Yeom, CN Pham, YJ Kim - Scientific reports, 2022 - nature.com
We propose a new method, ie, the statistical phase fraction (SPF) method, to estimate the
total porosity and spatial distribution of local porosities from subresolution pore-dominated X …

3D visualization of morphological evolution of large defects during spark plasma sintering of alumina granules

G Okuma, M Endo, H Minagawa… - Advanced …, 2023 - Wiley Online Library
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 …