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Idesaki, Akira; Wach, R. A.; Sugimoto, Masaki; Yoshikawa, Masahito
no journal, ,
Effects of 
-ray irradiation on a polymer blend of polycarbosilane and polyvinylsilane (a PCS-PVS blend) in the presence of oxygen were investigated. The PCS-PVS blends were oxidized during the irradiation of -rays to form crosslinking structures such as Si-O-Si and/or Si-O-C bonds. In case of a PCS-PVS blend containing 30wt% of polyvinylsilane, the absorbed dose enough for gellation decreased to less than 1/10 comparing with that for the pure polycarbosilane.
Sugimoto, Masaki; Yoshikawa, Masahito; Watanabe, Shogo*; Seki, Shu*
no journal, ,
We have succeeded in synthesizing metal folding ceramic (SiC) nano-fiber from Si-based precursor polymers using Single Particle Nanofabrication Technique (SPNT). Si-based polymers were cross-linked along ion tracks of nano-size in diameter through the whole thickness of polymer thin film. Nano-fiber was developed on the surface of the substrate by dissolution and washing away of uncross-linked polymer by solvent. Subsequent pyrolysis converted polymeric into inorganic SiC nano fibers. The diameter of nano fiber was depended on LET (liner energy transfer), molecular weight and cross-linking efficiency of polymers.
Taguchi, Tomitsugu; Hasegawa, Yoshio*; Yamamoto, Hiroyuki; Shamoto, Shinichi
no journal, ,
The effect of dispersion with carbon nanofiber (CNF) on porosity, thermal and mechanical properties of SiC/SiC composites were investigated. The SiC/SiC composites dispersed with CNF have lower porosity compared to those without CNF. On the other hand, the bending strength of SiC/SiC composites with CNF was slightly decreased compared to that without CNF. The thermal conductivity of SiC/SiC composites with CNF was twice as high as that without CNF. The reason is considered that the number of pore larger than 100 
m existing among the SiC fiber bundles was decreased by dispersing CNF in SiC/SiC composites.
, UO or PuO as a simulant for minor actinidesYamane, Junichi*; Imai, Masamitsu*; Furuta, Katsumi*; Yano, Toyohiko*; Miwa, Shuhei; Osaka, Masahiko
no journal, ,
Silicon nitride is a promising candidate to hold those nuclei for transmutation. Silicon nitride ceramics with CeO, UO or PuO as a simulant for minor actinides were fabricated through a simple powder metallurgy process.