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  1. No Access

    Article

    Influence of polymer infiltration and pyrolysis process on mechanical strength of polycarbosilane-derived silicon carbide ceramics

    In this article, strength evaluation of silicon carbide (Si–C) ceramics fabricated from polycarbosilane (PCS) precursor is described. Si–C ceramics was prepared by firing a green body made of the mixture of Si...

    Takahiro Namazu, Tomohiro Ishikawa, Yoshio Hasegawa in Journal of Materials Science (2011)

  2. No Access

    Article

    Local structure and defects in ultrahigh-temperature materials of borosilicon carbonitride

    We have investigated structural changes of amorphous borosilicon carbonitride materials with atomic ratios of B/Si/C of 2/3/6 and 4/3/6 calcined at several temperatures. The boron K-edge x-ray absorption spectra ...

    Kazuhiro Yamamoto, Naoya Tsuganezawa, Shin-ichi Makimura… in Journal of Materials Research (2008)

  3. No Access

    Article

    Photoinduced hydrophilicity and photocatalytic decomposition of endocrine-disrupting chemical pentachlorophenol on hollandite

    Surface properties and photocatalytic oxidation reactions on the hollandite-type compound K2Ga2Sn6O16 (KGSO) were examined for photoinduced hydrophilicity and oxidative decomposition of an endocrine-disrupting ch...

    Toshiyuki Mori, Mamoru Watanabe, Hiromitsu Nakajima… in Journal of Materials Research (2003)

  4. No Access

    Article

    Photocatalytic Reduction of NO with C2H6 on a Hollandite-Type Catalyst

    The photocatalytic reduction of nitrogen monoxide (NO) with ethane on the hollandite type catalyst (K2Ga2Sn6O16≡KGSO) was investigated. Using a closed-gas circulating system equipped with a Q-MASS detector and in...

    Jun Suzuki, Kenjiro Fujimoto, Toshiyuki Mori… in Journal of Sol-Gel Science and Technology (2000)

  5. No Access

    Article

    Photocatalytic Reduction of Nitrate in Water on Meso-Porous Hollandite Catalyst: A New Pathway on Removal of Nitrate in Water

    Photocatalysis of a hollandite compound K x Ga x Sn8−x O16 (x = ca. 1.8) was examined for the reduction of nitrate to N2 with a reducing agent o...

    Toshiyuki Mori, Jun Suzuki, Kenjiro Fujimoto… in Journal of Sol-Gel Science and Technology (2000)

  6. No Access

    Article

    Photocatalytic Reductions of Nitric Oxide in gas Phase and Nitrate ion in Water with Reducing Agents on Hollandite Catalyst

    Photoctalysis of a unique hollandite compound was investigated for the reductions of nitric oxide (NO) in gas phase and nitrate ion (NO3) in water with reducing agents under UV irradiation. Both NO and NO3 are ha...

    Toshiyuki Mori, Jun Suzuki, Kenjim Fujiimoto… in MRS Online Proceedings Library (1998)

  7. No Access

    Article

    Si-C fiber prepared from polycarbosilane cured without oxygen

    A new curing method for polycarbosilane was developed. In this method, halogenated hydrocarbon or unsaturated hydrocarbon vapor was used as curing agent. Si-C fiber with a small amount of oxygen was prepared f...

    Yoshio Hasegawa in Journal of Inorganic and Organometallic Polymers (1992)

  8. No Access

    Article

    Ceramic fibres from polymer precursor containing Si-O-Ti bonds

    Polycarbosilanes containing titanium alkoxide as pendant groups (atom ratio Ti/Si = 0.07 and 0.15) were synthesized. These polymers were melt-spun and then heat-treated in a vacuum, in oxygen or ammonia gas fl...

    Yoshio Hasegawa, Chun-**ang Feng, Yong-Cai Song, Zi-Lie Tan in Journal of Materials Science (1991)

  9. No Access

    Article

    Synthesis of continuous silicon carbide fibre

    Polycarbosilanes which were synthesized by three methods were melt-spun and cured by heating at low temperatures in air. The curing mechanism and the structure of these cured fibres were studied and the relati...

    Yoshio Hasegawa in Journal of Materials Science (1989)

  10. No Access

    Article

    Synthesis of continuous silicon carbide fibre

    Polycarbosilanes which were synthesized by three methods were melt-spun and cured by heating at low temperatures in air. The curing mechanism and the structure of these cured fibres were studied and the relati...

    Yoshio Hasegawa in Journal of Materials Science (1989)

  11. No Access

    Article

    Synthesis of continuous silicon carbide fibre

    The structure of polycarbosilane is represented by three structural elements, but their quantification is difficult. Polycarbosilanes were synthesized by three methods and the respective molecular structures w...

    Yoshio Hasegawa, Kiyohito Okamura in Journal of Materials Science (1986)

  12. No Access

    Article

    Synthesis of continuous silicon carbide fibre

    Polycarbosilanes which are the precursors of SiC fibre were synthesized by three methods. The molecular structure of each polycarbosilane was represented by means of three structural elements determined by IR,...

    Yoshio Hasegawa, Kiyohito Okamura in Journal of Materials Science (1983)

  13. No Access

    Article

    Synthesis of a polytitanocarbosilane and its conversion into inorganic compounds

    The novel polytitanocarbosilane, formed by the cross-linking of polycarbosilane with titanium tetra-alkoxide, was synthesized to examine the process of converting a multielement organometallic polymer into an ...

    Seishi Yajima, Tadashi Iwai, Takemi Yamamura… in Journal of Materials Science (1981)

  14. No Access

    Article

    Anomalous characteristics of the microcrystalline state of SiC fibres

    FIBRES of SiC are prepared1–4 from the polycarbosilane which, in various forms, is made into a precursor by melt-spinning: the precursor is then heated to produce the SiC fibre. Ceramics are produced in this way ...

    SEISHI YAJIMA, KIYOHITO OKAMURA, TAKAO MATSUZAWA, YOSHIO HASEGAWA… in Nature (1979)