Effect of Lithium Purity on In-Situ Formation of Er<sub>2</sub>O<sub>3 </sub>Oxide Layer on V-4Ti-4Cr Alloy

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Abstract

Effect of Li purity with respect to N on the features of in-situ formation of Er<sub>2</sub>O<sub>3 </sub>oxide coating on the surface of V-4Ti-4Cr alloy was investigated. Samples of V-4Ti-4Cr alloy (NIFS HEAT 2) were pre-charged by oxygen in Ar-7%O<sub>2 </sub>at 700<sup>◦</sup>C. The hardened zone with needle shaped Ti-O net structure was formed in the near-surface layers of V-alloy after oxidation. Oxygen pre-charged samples were exposed to N-containing Li (C<sub>N[Li] </sub>≤0.2 wt%) at 700<sup>◦</sup>C and Li pre-cleaned by getter (Zr) at 650<sup>◦</sup>C for 100 h. Both melts were doped with active Er impurity. It was shown that <i>in-situ </i>formation of E<sub>2</sub>O<sub>3 </sub>oxide coating on the surface of V-alloys depends strongly on the purity level of Li with regard to the N. In N-containing Li the coating was not formed on the surface of V-alloy, while whole oxygen pre-stored in V-matrix was dissolved by Li. On the contrary, in Li pre-cleaned with respect to N by Zr getter, the insulating oxide film was formed.

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 7(0), 2405123-2405123, 2012

    The Japan Society of Plasma Science and Nuclear Fusion Research

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