真空
Online ISSN : 1880-9413
Print ISSN : 0559-8516
JFT-2Mトカマク装置の放電にさらされたバナジウム合金の水素捕捉
小田 知正広畑 優子日野 友明仙石 盛夫
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2000 年 43 巻 3 号 p. 325-328

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Deuterium retention of V-4Cr-4Ti alloy exposed to JFT-2M tokamak environment for 9 months was examined by thermal desorption spectroscopy (TDS). The amount of deuterium retained in V-alloy was approximately 1 wppm, which was one order of magnitude larger than that of 304 SS. After the exposure, deposition of impurities was observed at the surface. The thickness of impurity layer was approximately 200 nm, and the titanium oxide was formed in this layer.
Surface oxidation of V-alloy was conducted in order to reduce the hydrogen absorption. After the oxidation at temperature of 373 K, thick Ti-O layer was formed at the surface. In this case, hydrogen absorption amount was one order of magnitude reduced compared with the case of no oxidation.

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