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Combustion-Aluminothermic Reduction of TiO2 to Produce Titanium Low Oxygen Suboxides

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Abstract

Titanium suboxides with the general formula TinO2n−1 (n > 1.0), also referred to as Magnéli phases, have been the subject of numerous studies due to their unique properties. Titanium low oxygen suboxides located at n = 1 (TiO) or below (Ti6O, Ti3O and Ti2O) are no less important; however, there is a lack of research on the synthesis of such materials. Therefore, in this article, the combustion process in a TiO2-KClO4-kAl-Flux exothermic system for 0.5 ≤ k ≤ 4.0 (k is moles of Al) is investigated experimentally and thermodynamically to synthesize TinO2n−1 ingots in the 0.5 to 1.0 range of n. The synthesis temperatures and equilibrium reaction phases are calculated with and without a KClO4 booster and several fluxes (CaF2, NaF, CaO and Na3AlF6), which are used to melt the reaction product and achieve the self-separation of the TinO2n−1 ingot from the Al2O3-containing slag. The formation TiO, Ti2O, Ti3O and Ti6O phases is confirmed via XRD analysis and the effectiveness of fluxes is highlighted.

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Acknowledgments

This work was supported by the Industrial Strategic Technology Development Program (20010585, High purity metal refining technology for titanium metal with zero toxic gas emission) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).

Conflict of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Authors and Affiliations

  1. Graduate School of Materials Science & Engineering, Chungnam National University, 99 Daehakro, Yuseong-gu, Daejeon, 34134, Republic of Korea

    Jong Hyeon Lee, Kyu-Seok Lim, Wan-Bae Kim & Woo-Seok Choi

  2. RASOM, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea

    Jong Hyeon Lee & Hayk Nersisyan

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  1. Jong Hyeon Lee
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  2. Hayk Nersisyan
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Correspondence to Jong Hyeon Lee.

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Manuscript submitted May 23. 2021; accepted September 1, 2021.

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Lee, J.H., Nersisyan, H., Lim, KS. et al. Combustion-Aluminothermic Reduction of TiO2 to Produce Titanium Low Oxygen Suboxides. Metall Mater Trans B 52, 4012–4022 (2021). https://doi.org/10.1007/s11663-021-02316-1

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