Magnesiothermic reduction for direct synthesis of Ti-Nb alloy at 1073 K (800 °C)

Kyunsuk Choi; Kwang Hee Lee; Basit Ali; Sang Hoon Choi; Kyoung Tae Park; Il Sohn

doi:10.1007/s12540-017-7010-4

Magnesiothermic reduction for direct synthesis of Ti-Nb alloy at 1073 K (800 °C)

Kyunsuk Choi, Kwang Hee Lee, Basit Ali, Sang Hoon Choi, Kyoung Tae Park, Il Sohn

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

Direct fabrication of titanium (Ti) and niobium (Nb) alloys by direct magnesiothermic reduction from the respective initial metal oxides and complex oxides has been studied. TiO₂, Nb₂O₅, and complex TiNb₂O₇ oxides were used as raw materials with Mg used as a reductant. To ensure a high chemical potential of the reactants to drive the spontaneous magnesiothermic reduction of the oxide mixtures, excess Mg five times higher than the required stoichiometric molar ratio was added. Samples were heated in a glove box under recycled and purified Ar atmosphere at 1073 K (800 °C) for 10 h. After the reduction of TiO₂, intermediate oxide phases of Ti₆O could still be observed, but reduction of Nb₂O₅ and TiNb₂O₇ showed metallic Nb and Ti-Nb to be present with negligible oxides according to the scanning electron microscope-energy dispersive spectroscopy and x ray diffraction analysis. This indicated that direct fabrication of Ti-Nb alloys through a complex TiNb₂O₇ oxide is possible and can be more efficient than alloying pure metallic elements of Ti and Nb.

Original language	English
Pages (from-to)	1037-1044
Number of pages	8
Journal	Metals and Materials International
Volume	23
Issue number	5
DOIs	https://doi.org/10.1007/s12540-017-7010-4
Publication status	Published - 2017 Sept 1

Bibliographical note

Funding Information:
This study was partially supported by the Brain Korea 21 PLUS (BK21 PLUS) Project at the Division of the Eco-Humantronics Information Materials and the Energy Efficiency and Resources Core Technology Program of Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant from the Ministry of Trade, Industry and Energy, Republic of Korea (20132520000030).

Publisher Copyright:
© 2017, The Korean Institute of Metals and Materials and Springer Science+Business Media B.V.

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys
Materials Chemistry

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10.1007/s12540-017-7010-4

Cite this

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abstract = "Direct fabrication of titanium (Ti) and niobium (Nb) alloys by direct magnesiothermic reduction from the respective initial metal oxides and complex oxides has been studied. TiO2, Nb2O5, and complex TiNb2O7 oxides were used as raw materials with Mg used as a reductant. To ensure a high chemical potential of the reactants to drive the spontaneous magnesiothermic reduction of the oxide mixtures, excess Mg five times higher than the required stoichiometric molar ratio was added. Samples were heated in a glove box under recycled and purified Ar atmosphere at 1073 K (800 °C) for 10 h. After the reduction of TiO2, intermediate oxide phases of Ti6O could still be observed, but reduction of Nb2O5 and TiNb2O7 showed metallic Nb and Ti-Nb to be present with negligible oxides according to the scanning electron microscope-energy dispersive spectroscopy and x ray diffraction analysis. This indicated that direct fabrication of Ti-Nb alloys through a complex TiNb2O7 oxide is possible and can be more efficient than alloying pure metallic elements of Ti and Nb.",

author = "Kyunsuk Choi and Lee, {Kwang Hee} and Basit Ali and Choi, {Sang Hoon} and Park, {Kyoung Tae} and Il Sohn",

note = "Funding Information: This study was partially supported by the Brain Korea 21 PLUS (BK21 PLUS) Project at the Division of the Eco-Humantronics Information Materials and the Energy Efficiency and Resources Core Technology Program of Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant from the Ministry of Trade, Industry and Energy, Republic of Korea (20132520000030). Publisher Copyright: {\textcopyright} 2017, The Korean Institute of Metals and Materials and Springer Science+Business Media B.V.",

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AU - Choi, Kyunsuk

AU - Lee, Kwang Hee

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AU - Choi, Sang Hoon

AU - Park, Kyoung Tae

AU - Sohn, Il

N1 - Funding Information: This study was partially supported by the Brain Korea 21 PLUS (BK21 PLUS) Project at the Division of the Eco-Humantronics Information Materials and the Energy Efficiency and Resources Core Technology Program of Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant from the Ministry of Trade, Industry and Energy, Republic of Korea (20132520000030). Publisher Copyright: © 2017, The Korean Institute of Metals and Materials and Springer Science+Business Media B.V.

PY - 2017/9/1

Y1 - 2017/9/1

N2 - Direct fabrication of titanium (Ti) and niobium (Nb) alloys by direct magnesiothermic reduction from the respective initial metal oxides and complex oxides has been studied. TiO2, Nb2O5, and complex TiNb2O7 oxides were used as raw materials with Mg used as a reductant. To ensure a high chemical potential of the reactants to drive the spontaneous magnesiothermic reduction of the oxide mixtures, excess Mg five times higher than the required stoichiometric molar ratio was added. Samples were heated in a glove box under recycled and purified Ar atmosphere at 1073 K (800 °C) for 10 h. After the reduction of TiO2, intermediate oxide phases of Ti6O could still be observed, but reduction of Nb2O5 and TiNb2O7 showed metallic Nb and Ti-Nb to be present with negligible oxides according to the scanning electron microscope-energy dispersive spectroscopy and x ray diffraction analysis. This indicated that direct fabrication of Ti-Nb alloys through a complex TiNb2O7 oxide is possible and can be more efficient than alloying pure metallic elements of Ti and Nb.

AB - Direct fabrication of titanium (Ti) and niobium (Nb) alloys by direct magnesiothermic reduction from the respective initial metal oxides and complex oxides has been studied. TiO2, Nb2O5, and complex TiNb2O7 oxides were used as raw materials with Mg used as a reductant. To ensure a high chemical potential of the reactants to drive the spontaneous magnesiothermic reduction of the oxide mixtures, excess Mg five times higher than the required stoichiometric molar ratio was added. Samples were heated in a glove box under recycled and purified Ar atmosphere at 1073 K (800 °C) for 10 h. After the reduction of TiO2, intermediate oxide phases of Ti6O could still be observed, but reduction of Nb2O5 and TiNb2O7 showed metallic Nb and Ti-Nb to be present with negligible oxides according to the scanning electron microscope-energy dispersive spectroscopy and x ray diffraction analysis. This indicated that direct fabrication of Ti-Nb alloys through a complex TiNb2O7 oxide is possible and can be more efficient than alloying pure metallic elements of Ti and Nb.

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Magnesiothermic reduction for direct synthesis of Ti-Nb alloy at 1073 K (800 °C)

Abstract

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