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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.42  No.8 (2001)  >  pp.1794-1799

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A Novel Thermic Process for Producing V-Based Solid Solution Type Hydrogen Storage Alloy

Akio Kawabata1), Hideo Yoshinaga1), Makoto Tsukahara2), Tetsuo Sakai3), Seiji Sakurai1), Yoshihisa Kamiya2), Kunio Takahashi2), Hiroyuki Takeshita3), Nobuhiro Kuriyama3) and Jun Shi3)
1) Ako Laboratory, Taiyo Koko Co., Ltd.
2) IMRA Material R&D Co., Ltd.
3) Osaka National Research Institute

The performance of a high hydrogen capacity alloy, V–16%Ti–12%Ni–1.4%Nb–0.96%Co–2.8%Ta, is sensitively influenced by dissolved aluminum and oxygen, both of which can be removed from vanadium by a refining process, but the process currently used is too expensive. It is necessary to develop a process to remove these impurities at a reasonable cost. We propose a new method for production of the alloy. A V–15%Ni–1.8%Nb precursor with a low enough level of aluminum was produced by alumino-thermic reduction from a mixture of V2O5, Nb2O5 and nickel. Subsequently, a V–16%Ti–12%Ni–1.4%Nb–0.96%Co–2.8%Ta alloy was obtained by alloying the precursor and the other constituents of titanium, cobalt and tantalum, and by adding mischmetal as a reducing agent to remove oxygen to a low enough level. It was demonstrated that, by the method described here, the vanadium-based alloy could be produced at a reasonable cost.

vanadium, solid solution, hydrogen storage alloy, hydrogen absorption, pressure-composition-isotherm, thermic reduction, deoxidization, concentration equilibrium constant, mischmetal, oxygen, aluminum

Received: February 23, 2001
Accepted: June 29, 2001 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals



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