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Usui, Takahiro*; Sawada, Akihiko; Amaya, Masaki; Suzuki, Akihiro*; Chikada, Takumi*; Terai, Takayuki*
Journal of Nuclear Science and Technology, 52(10), p.1318 - 1322, 2015/10
Times Cited Count：48 Percentile：97.32(Nuclear Science & Technology)SiC coating is one of countermeasures for the prevention of oxidation and hydrogen embrittlement of fuel claddings because SiC has high resistance of oxidation and hydrogen permeation. Hydrogen permeation and oxidation experiments for the cladding materials with SiC coatings were conducted in unirradiated conditions. The sputtering method was employed to make SiC coatings. In the hydrogen permeation experiment, SUS316 was used as a base material of the coating. SUS316 with SiC coatings showed hydrogen permeation reduction by one order of magnitude. In the oxidation experiments, Zry-4 and SUS316 were used as base materials of the coatings. The weight gain of the Zry-4 specimens with a SiC coating decreased by about one-fifth compared to the uncoated ones. This phenomenon was observed for SUS316 at 750 
C as well. The peel-off of the coating was observed in some experiments, and it is considered that the peel-off was caused by the difference of the thermal expansions between coatings and base materials. Thicker coatings showed better oxidation resistance, but thinner coatings showed more tolerance of peel-off.
Uchida, Shunsuke; Sato, Tomonori; Tsukada, Takashi; Sato, Yoshiyuki*; Miyazawa, Takahiro*; Terachi, Takumi*; Wada, Yoichi*; Hosokawa, Hideyuki*
Proceedings of International Conference on Water Chemistry of Nuclear Reactor Systems 2006 (CD-ROM), 6 Pages, 2006/10
no abstracts in English
Miyazawa, Takahiro*; Terachi, Takumi*; Uchida, Shunsuke*; Sato, Tomonori; Tsukada, Takashi; Sato, Yoshiyuki*; Wada, Yoichi*; Hosokawa, Hideyuki*
Journal of Nuclear Science and Technology, 43(8), p.884 - 895, 2006/08
Times Cited Count：65 Percentile：96.69(Nuclear Science & Technology)In order to understand corrosion behavior of stainless steel in BWR reactor water conditions, characteristics of oxide films on stainless steel specimens exposed to H
O and O in high temperature water were determined by multilateral surface analyses. The following points were experimentally confirmed. (1) Oxide layers were divided into inner and outer layers: Outer layers of the specimen exposed to 100ppb HO consisted of larger corundum type hematite particles, while inner layersconsisted of very fine Ni rich spinel type magnetite. (2) Outer oxide layers consisted of oxide particles, whose density and size were changed by oxidant concentration. The average diameter decreased with [O] and [HO]. (3) A larger dissolution rate at higher [HO] resulted in a thinner oxide film with smaller particles.
Shiraki, Atsuhiro*; Wada, Takumi*; Murata, Yoshinori*; Morinaga, Masahiko*; Takaya, Shigeru; Koyama, Toshiyuki*
no journal, ,
no abstracts in English
Usui, Takahiro*; Sawada, Akihiko; Amaya, Masaki; Suzuki, Akihiro*; Chikada, Takumi*; Terai, Takayuki*
no journal, ,
SiC coatings were fabricated on SUS316 and Zircaloy-4 substrate. Hydrogen permeation experiment and oxidation experiment were performed. From hydrogen permeation experiment to SiC coated specimen on SUS316 subsrate, permeability of specimen was smaller in one order in magnitude than that of uncoated. From oxidation experiment on Zircaloy-4 substrate, weight gain and thickness of oxide film decreased. Specimens with thicker coating has less weight gain than that with thinner coating, however, thicker coating was peeled off more than thinner coating after oxidized in 1200C.
Watanabe, So; Sasa, Toshinobu; Owada, Hitoshi*; Saito, Takumi*; Ishio, Takahiro*; Murakami, Tsuyoshi*; Shimada, Takashi*
no journal, ,
no abstracts in English
Watanabe, So; Sasa, Toshinobu; Owada, Hitoshi*; Saito, Takumi*; Ishio, Takahiro*; Murakami, Tsuyoshi*; Shimada, Takashi*
no journal, ,
no abstracts in English
