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Direct Production of Ti-29Nb-13Ta-4.6Zr Biomedical Alloy from Oxide Mixture in Molten CaCl2

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Title: Direct Production of Ti-29Nb-13Ta-4.6Zr Biomedical Alloy from Oxide Mixture in Molten CaCl2
Authors: Osaki, Shogo Browse this author
Sakai, Hiroshi Browse this author
Suzuki, Ryosuke O. Browse this author →KAKEN DB
Keywords: calcium compounds
electrolysis
heat treatment
niobium alloys
powder technology
sintering
solid solutions
tantalum alloys
titanium alloys
zirconium alloys
Issue Date: 3-Jun-2010
Publisher: The Electrochemical Society
Journal Title: Journal of the Electrochemical Society
Volume: 157
Issue: 8
Start Page: E117
End Page: E121
Publisher DOI: 10.1149/1.3435302
Abstract: A process based on the principle of the Ono-Suzuki process involving electrolysis and the calciothermic coreduction of an oxide mixture consisting of TiO2, Nb2O5, Ta2O5, and ZrO2 for producing Ti-29Nb-23Ta-4.6Zr (TNTZ) was proposed. Ca was produced by the electrolysis of CaO in molten CaCl2 by applying a voltage of 3.2 V between a carbon anode and Ti cathode at 1173 K. The residual oxygen concentration in the obtained powder decreased monotonically with an increase in the supplied electric charge. An oxygen concentration of 0.19 mass % was attained by supplying the electrical charge around 3 times larger than that necessary to generate the stoichiometrically required amount of Ca. This sample consisted of a Ti-based body-centered cubic solid solution and a small amount of hexagonal close-packed (hcp) solid solution. The inhomogeneity in the composition was suppressed to a relatively low level so that it could be easily improved by heat-treatment. After sintering at 1300 K for 54 ks, for example, the Ti- and Zr-rich hcp phase disappeared and the composition achieved the targeted value. The results of this study indicate that the OS process can be applied to directly produce TNTZ alloy from an oxide mixture.
Rights: © The Electrochemical Society, Inc. 2010. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in J. Electrochem. Soc., 157(8), pp. E117-E121 (2010)
Type: article
URI: http://hdl.handle.net/2115/43282
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 鈴木 亮輔

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