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Igawa, Naoki; Taguchi, Tomitsugu; Nozawa, Takashi*; Snead, L. L.*; Hinoki, Tatsuya*; McLaughlin, J. C.*; Kato, Yutai*; Jitsukawa, Shiro; Koyama, Akira*
Journal of Physics and Chemistry of Solids, 66(2-4), p.551 - 554, 2005/02
Times Cited Count：47 Percentile：82.48(Chemistry, Multidisciplinary)Silicon carbide is an important engineering ceramic because of its high strength and stability at high temperature and low induced radioactivity after neutron irradiation. Though monolithic SiC is brittle and low toughness, SiC fiber reinforced SiC matrix composites significantly improve these properties and therefore are attractive candidate materials for fusion reactor structural applications. Recently, stoichiometric SiC fibers with superior mechanical properties have been produced. We carried out the optimization of interface and composite fabrication using the chemical vapor infiltration, which is the one of the best techniques to fabricate the SiC composite. The composite with higher density and homogeneous matrix was obtained by the optimization of materials and carrier gas flow rate. The porosity was decreased with increasing the fiber volume fraction. We adopted the carbon or carbon/SiC interface between fiber and matrix and we found that the dependence of interface thickness on the tensile properties was small in the interface thickness from 50 to 300 nm.
Yamada, Reiji; Igawa, Naoki; Taguchi, Tomitsugu
Advanced SiC/SiC Ceramic Composites: Developments and Applications in Energy Systems; Ceramic Transactions Vol. 144, p.289 - 299, 2002/00
A Finite-element method(FEM) was applied for a computer simulation of a laser flash method for measuring thermal diffusivity of SiC/SiC composites. To understand the effect of individual fiber and matrix thermal conductivities as well as fiber volume on the overall composite's thermal diffusivity, the cases of high and low values for the fiber and matrix thermal conductivities were calculated as a function of fiber volume fraction at specimen temperatures of 200 and 900
. The results of calculations showed that if low thermal conductive SiC fibers were used, the increase of fiber volume worsened the composite thermal diffusivity with highly conductive matrix, whereas when using highly conductive SiC fiber, the effect of increasing fiber volume was positive for increasing the composite diffusivity with low matrix thermal conductivity. The specimen temperatures altered the values of the composite thermal diffusivity but the qualitative tendencies above mentioned were maintained.
Igawa, Naoki; Taguchi, Tomitsugu; Yamada, Reiji; Jitsukawa, Shiro
Ceramic Engineering and Science Proceedings (24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B), 21(4), p.237 - 242, 2000/09
no abstracts in English
Idesaki, Akira*; Narisawa, Masaki*; Okamura, Kiyohito*; Sugimoto, Masaki; Morita, Yosuke; Seguchi, Tadao; Ito, Masayoshi*
Proceedings of International Symposium on Prospect for Application of Radiation towards the 21st Century, p.139 - 140, 2000/03
no abstracts in English
Seguchi, Tadao
Keiso Kagaku Kyoukaishi, (9), p.24 - 25, 1998/11
no abstracts in English
Suzuya, Kentaro; Furusaka, Michihiro*; Watanabe, Noboru*; *; Okamura, K.*; *; Kamiyama, Tomoaki*; Suzuki, Kenji*
J. Mater. Res., 11(5), p.1169 - 1178, 1996/05
no abstracts in English
Sugimoto, Masaki; Okamura, K.*; Seguchi, Tadao
Material Chemistry 96: Proc. of Int. Symp. on Material Chemistry in Nuclear Environment, 0, p.587 - 593, 1996/00
no abstracts in English
Sugimoto, Masaki; Okamura, K.*; Seguchi, Tadao
High-Temperature Ceramic-Matrix Composites II (HT-CMC2), 0, p.293 - 298, 1995/00
no abstracts in English
Shindo, Masami; Seguchi, Tadao
Genshiryoku Kogyo, 39(8), p.53 - 61, 1993/00
no abstracts in English
Okamura, K.*; Seguchi, Tadao
Sentan Gijutsu Hairaito, 0(108), p.1 - 6, 1992/09
no abstracts in English
N
fiberOkamura, K.*; Shimoo, Toshio *; Seguchi, Tadao
Seramikku Detabukku 1991, p.292 - 297, 1991/00
no abstracts in English
