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Deoxidation Behavior of Zr Powder Manufactured by Using Self-Propagating High-Temperature Synthesis with Mg Reducing Agent

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Abstract

In this study, the deoxidation behavior of Zr powder with the use of a Mg reductant is discussed. The original Zr powder was produced by the hydride-dehydride (HDH) method. The raw Zr powder has a thick surface oxide layer of 43 nm as well as high oxygen concentration in the inner part of the powder. The raw Zr powder carries out the reduction reaction with the Mg agent, which maintains self-propagating high-temperature synthesis (SHS) by releasing significant exothermic heat, thereby decreasing the oxygen content. The surface oxide layer of the deoxidized Zr powder is thinner than that of the raw Zr powder, as observed by transmission electron microscopy (TEM) and Auger electron spectroscopy (AES). Furthermore, the oxygen atoms in the inner part of the Zr powder are easily released by a bcc structure providing more active migration of interstitial atoms induced by the open structure at high temperature, and the emitted oxygen atoms readily react with the Mg agent. The lattice parameters of the deoxidized Zr powders, therefore, are decreased with the reduction of oxygen content in comparison with the raw Zr powder because of shrinkage by the decrease of the excess oxygen interstitial atoms. These results are consistent with the observation that the oxygen content in the raw and deoxidized Zr powder was reduced from 0.595 to 0.338 wt pct due to the decreased surface oxide layer and oxygen content in the inner part of the Zr powder, respectively. It is, thus, confirmed that the Mg agent is capable of playing an important role in the deoxidation behavior in Zr powder to obtain high-purity Zr powder.

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Author notes

  1. Hyung Lae Kima and Chang Gun Yuna have contributed equally to this work.

Authors and Affiliations

  1. SMR Fuel Development Team, Korea Atomic Energy Research Institute (KAERI), Deajeon, 34057, Republic of Korea

    Hyung Lae Kim, Chang Gun Yun, Jung Hwan Ju, Hyun-Joon Jun & Ho Jin Lee

  2. Material Science and Engineering Department, Chungnam National University, Deajeon, 34134, Republic of Korea

    Chang Gun Yun

  3. Research Center, Sejong Materials, Incheon, 21688, Republic of Korea

    Ho Ha

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  1. Hyung Lae Kim
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Manuscript submitted August 8, 2019.

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Kim, H.L., Yun, C.G., Ju, J.H. et al. Deoxidation Behavior of Zr Powder Manufactured by Using Self-Propagating High-Temperature Synthesis with Mg Reducing Agent. Metall Mater Trans B 51, 1070–1078 (2020). https://doi.org/10.1007/s11663-020-01815-x

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  • DOI: https://doi.org/10.1007/s11663-020-01815-x

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