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
2000 年 43 巻 3 号 p. 325-328
詳細
2000 年 43 巻 3 号 p. 325-328
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.
