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Ultimate Deoxidation Method of Titanium Utilizing Y/YOCl/YCl3 Equilibrium

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Abstract

Deoxidation methods of titanium (Ti) scrap and Ti powder have become increasingly important in recent years. Some rare earth (RE) metals with strong deoxidizing capabilities, including Y, La, Ce, and Ho, are candidate agents for the development of a new deoxidation technology. In this study, a new method was developed to directly remove oxygen (O) from Ti using the Y/YOCl/YCl3 equilibrium. According to the calculation based on available thermodynamic data in the literature, the O concentration in β-Ti can be reduced to less than 10 ppm O at 1300 K (1027 °C) in the Y/YOCl/YCl3 equilibrium. To demonstrate the effectiveness of this method using the Y/YOCl/YCl3 equilibrium, the deoxidation limits of Ti samples using Y metal in YCl3 (l) or in YCl3-NaCl-KCl (l) at 1300 K (1027 °C) were experimentally investigated in this study. As a result, the O concentrations in the Ti samples were from 30 to 60 ppm O in YCl3 (l). This result revealed that Ti with extremely low O concentration can be reliably obtained using the RE/REOCl/RECl3 equilibrium for the first time. The establishment of this process will realize efficient recycling of Ti scrap and production of low O concentration Ti powder, which contribute to the large-scale use of Ti products.

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Acknowledgments

The authors are grateful to Dr. Lingxin Kong and Mr. Takara Tanaka at The University of Tokyo for their helpful suggestions and help in the experiments. This work was financially supported by the Japan Society for the Promotion of Science (JSPS) through a Grant-in-Aid for Scientific Research (s) (KAKENHI Grant Nos. 26220910, and 19H05623).

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Authors and Affiliations

  1. Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan

    Akihiro Iizuka, Takanari Ouchi & Toru H. Okabe

  2. Department of Materials Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan

    Akihiro Iizuka

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  1. Akihiro Iizuka
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Correspondence to Takanari Ouchi.

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Manuscript submitted August 13, 2019.

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Iizuka, A., Ouchi, T. & Okabe, T.H. Ultimate Deoxidation Method of Titanium Utilizing Y/YOCl/YCl3 Equilibrium. Metall Mater Trans B 51, 433–442 (2020). https://doi.org/10.1007/s11663-019-01742-6

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