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Helium gas permeability of SiC/SiC composite after heat cycles

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Title: Helium gas permeability of SiC/SiC composite after heat cycles
Authors: Hino, T. Browse this author →KAKEN DB
Hayashishita, E. Browse this author
Kohyama, A. Browse this author
Yamauchi, Y. Browse this author →KAKEN DB
Hirohata, Y. Browse this author
Keywords: S0400(Silicon and Silicon Compounds)
F0400(First Wall Materials)
H0100(Heat Treatment)
Issue Date: 1-Aug-2007
Publisher: Elsevier B.V.
Journal Title: Journal of Nuclear Materials
Volume: 367-370
Issue: 1
Start Page: 736
End Page: 741
Publisher DOI: 10.1016/j.jnucmat.2007.03.089
Abstract: In a blanket made of SiC/SiC composite, helium gas employed as coolant may leak into plasma, resulting in fuel dilution. The helium gas permeability of SiC/SiC composite has to be measured to qualify SiC/SiC composite as a blanket material. Since the SiC/SiC blanket receives heat cycles due to plasma start up and shut down phases, the change of helium gas permeability after the heat load has to be investigated. Heat cycles with different highest temperatures and heating rates were applied to SiC/SiC composite with very low permeability, and the change of permeability was measured. No increase in the permeability was observed for an operation temperature of SiC/SiC blanket at 1100 K. The increase of permeability was observed only when the maximum temperature was very high, 1300 K, and when the heating rate was also large, 10 K/s. The operational regime without increase of permeability was determined based upon the present data.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 日野 友明

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