Papers by Author: Tohru Suzuki

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Authors: Keijiro Hiraga, Yoshio Sakka, Tohru Suzuki, K. Nakano
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Authors: Keijiro Hiraga, K. Nakano, Tohru Suzuki, Yoshio Sakka
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Authors: Keijiro Hiraga, K. Nakano, Tohru Suzuki, Yoshio Sakka
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Authors: Yoshio Sakka, Tohru Suzuki, Koji Morita, Keijiro Hiraga
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Authors: Tohru Suzuki, Tetsuo Uchikoshi, Yoshio Sakka
Abstract: The mechanical properties of ceramics materials can be tailored by designing their microstructures. Residual stress is one of the important factors for controlling the crack propagation and consequently improving the mechanical properties. On the other hand, development of the crystallographic orientation even in a diamagnetic ceramic can be controlled by colloidal processing in a strong magnetic field. In this study, alumina/alumina laminar composites with different crystalline-oriented layers were fabricated by EPD in a strong magnetic field in order to control the residual stress using the difference in the thermal expansion of each layer.
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Authors: Tetsuo Uchikoshi, Tohru Suzuki, Hideo Okuyama, Yoshio Sakka
Abstract: Highly crystalline-textured alumina ceramics were fabricated by electrophoretic deposition (EPD) in a strong magnetic field of 12 T. Preferred orientation of the bulk was controlled by changing the direction of the applied electric field E relative to the magnetic field B during the EPD. Average orientation angle of the prepared monoliths as a function of the angle between the vectors E and B, ϕ B-E was estimated from the X-ray diffraction analysis. Alumina/alumina laminar composites with crystalline- oriented layers were also fabricated by alternately changing the ϕ B-E layer by layer during EPD in a magnetic field of 12 T.
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Authors: Tetsuo Uchikoshi, Seiichi Furumi, Tohru Suzuki, Yoshio Sakka
Abstract: Cathodic electrophoretic deposition of bimodal alumina suspension was performed using conductive polypyrrole (Ppy) film as an electrode. The coating of the Ppy on nonconductive ceramic substrates was performed by polymerization of pyrrole (Py) in an aqueous solution. The relative green density of the deposits measured by Archimedes’ method was 68 %. Alumina ceramics were obtained by sintering the deposits together with the Ppy coated ceramic substrates in air.
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Authors: Ichiro Fujii, Rintaro Mori, Kouichi Nakashima, Hiroshi Hayashi, Yoshitaka Nagamori, Yuichi Yamamoto, Tohru Suzuki, Satoshi Wada
Abstract: The piezoelectric response of [11-oriented, fine-grained BaTiO3 ceramics was investigated. It was found that an exposure of the BaTiO3 compacts to high-pressure, high-temperature steam in an autoclave promoted the orientation of the sintered ceramics. As temperature in the autoclave increased, the orientation increased. A large small-field piezoelectric constant of d33 = 517 pC/N was observed for the oriented BaTiO3 ceramics with the grain size of 1.76 μm and the Lotgering factor of 85.3 %.
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