Papers by Author: Toyohiko Yano

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Authors: A.Toshimitsu Yokobori Jr., Toyohiko Yano, Y. Okamoto
Authors: Hidetoshi Miyazaki, T. Naganuma, Takayoshi Iseki, Kazuhiro Yasuda, Toyohiko Yano
Authors: Yuki Sekimoto, Thanakorn Wasanapiarnpong, Masamitsu Imai, Keiichi Katayama, Toyohiko Yano
Authors: Toyohiko Yano, Dae Chul Park, Yasutaka Horie, Hirofumi Inoue, Keiichi Katayama, Takayoshi Iseki
Authors: Kozue Matsukawa, Masamitsu Imai, Toyohiko Yano
Abstract: Monazite(LaPO4)-coated alumina-fiber/alumina-YAG (Y3Al5O12) matrix composites were fabricated by in-situ coating of monazite followed by hot-pressing, and the effects of coating and sintering condition on mechanical properties of the composite were examined. Alumina powder and YAG powder (weight ratio, 95:5) were used as raw materials for green sheets, which was fabricated by tape casting technique. Monazite was synthesized by the in-situ reaction of La(NO3) solution with H3PO4 on the surface of fibers. After slurry infiltration into the coated fiber bundles, the fiber cloths were laminated with the green sheets alternately, then they were heat-treated, finally sintered by hot-pressing at various temperatures. The mechanical properties of the composites were changed by the fabrication conditions. Non-brittleness of the composites reduced with the increase of sintering temperature. The composites sintered at 1200oC showed the highest Weibull modulus and pseudo-ductility.
Authors: Tomohiro Kobayashi, Katsumi Yoshida, Toyohiko Yano
Abstract: The CNT/B4C composite with Al2O3 additive was fabricated by hot-pressing following extrusion molding of a CNT/B4C paste, and mechanical properties of the obtained composite were investigated. Many CNTs in the composite aligned along the extrusion direction from SEM observation. 3-points bending strength of the composite was slightly lower than that of the monolithic B4C. Elastic modulus and Vickers hardness of the composite drastically decreased with CNT addition. Fracture toughness of the composite was higher than that of the monolithic B4C.
Authors: Katsumi Yoshida, Hideki Matsumoto, Masamitsu Imai, Kazuaki Hashimoto, Yoshitomo Toda, Toyohiko Yano
Abstract: In this study, Tyranno SA fiber cloth was coated with carbon black and SiC powder containing sintering aids by means of electrophoretic deposition method, and SiC/SiC composites with three different fiber volume fractions were fabricated using the Tyranno SA cloth by hot-pressing at 1700oC. The sufficient formation of the SiC matrix between each fiber could be observed. The composite fractured in non-brittle manner, and bending strength decreased with increasing fiber volume fraction. The crack propagation and fracture behavior depended on the fiber volume fraction. These differences in bending strength and fracture behavior would be caused by the difference in the interfacial bonding between fiber cloth and the matrix.
Authors: K. Yoshida, Kazuaki Hashimoto, Yoshitomo Toda, S. Udagawa, Toyohiko Yano
Authors: Jae Seol Lee, Hyeon Taek Son, Toyohiko Yano
Abstract: The layers of ZrO2-Al2O3 were coated on the surface of SiC fibers (Tyranno SA fiber) by dip-coating process. The citric acid-ethylene glycol solution containing Al and Zr ions was polymerized at 150oC to obtain a polymerized complex precursor. The 2D-woven SiC Tyranno SA fibers were dipped into this precursor few times. Heat treatment for coated fiber was conducted at 800-1200oC for 1 h in air. Thin film of mixed zirconium/aluminum oxides on SiC fibers were successfully elaborated using the sol-gel process. The coated zirconium/aluminum oxides layer of SiC Tyranno SA fiber was about 200-1000 nm. The coated fibers were stable in an oxidizing environment even at high temperatures.
Authors: Hidetoshi Miyazaki, Satoshi Shimizu, Takayoshi Iseki, Kazuhiro Yasuda, Toyohiko Yano, Mamoru Mitomo
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