[Table of Contents]

Plasma and Fusion Research

Volume 7, 2405123 (2012)

Regular Articles

Effect of Lithium Purity on In-Situ Formation of Er2O3 Oxide Layer on V-4Ti-4Cr Alloy
Valentyn TSISAR, Olga YELISEYEVA, Takeo MUROGA1) and Takuya NAGASAKA1)
Physical-Mechanical Institute of National Academy of Sciences of Ukraine, 5 Naukova St., 79601 Lviv, Ukraine
1)
National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
(Received 27 November 2011 / Accepted 29 June 2012 / Published 13 September 2012)

Abstract

Effect of Li purity with respect to N on the features of in-situ formation of Er2O3 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%O2 at 700°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 (CN[Li] ≤ 0.2 wt%) at 700°C and Li pre-cleaned by getter (Zr) at 650°C for 100 h. Both melts were doped with active Er impurity. It was shown that in-situ formation of E2O3 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.

Keywords

V-alloy, oxidation, liquid Li, N impurity, insulator coating

DOI: 10.1585/pfr.7.2405123

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This paper may be cited as follows:

Valentyn TSISAR, Olga YELISEYEVA, Takeo MUROGA and Takuya NAGASAKA, Plasma Fusion Res. 7, 2405123 (2012).