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Thermal Conductivity Measurement of Molten Cu-Co Alloy Using an Electromagnetic Levitator Superimposed with a Static Magnetic Field

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Abstract

The thermal conductivity of molten Cu-Co alloy with different compositions around the liquidus line temperature was measured by the periodic laser-heating method using an electromagnetic levitator superimposed with a static magnetic field to suppress convection in a levitated droplet sample. During the measurement, a static magnetic field of 10 T was applied to the levitated droplet. To confirm that the strength of the static magnetic field was sufficient to suppress convection in the droplet, numerical simulations were performed for the flow and thermal fields in an electromagnetically levitated droplet under a static magnetic field, and moreover, for the periodic laser-heating method to determine the thermal conductivity. It was found that the thermal conductivity of molten Cu-Co alloy increased gradually with increasing Cu composition up to 80 at. pct, beyond which it increased markedly and reached that of pure Cu. In addition, it was found that the composition dependence of the thermal conductivity can be explainable by the Wiedemann–Franz law.

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Authors and Affiliations

  1. Department of Chemical Engineering, Tohoku University, 6-6-07 Aramaki, Aoba-ku, Sendai-shi, Miyagi, 980-8579, Japan

    Yuki Nakamura, Ryuji Takahashi, Eita Shoji, Masaki Kubo & Takao Tsukada

  2. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai-shi, Miyagi, 980-8577, Japan

    Masahito Uchikoshi & Hiroyuki Fukuyama

Authors
  1. Yuki Nakamura
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  2. Ryuji Takahashi
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  3. Eita Shoji
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  4. Masaki Kubo
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  5. Takao Tsukada
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  6. Masahito Uchikoshi
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  7. Hiroyuki Fukuyama
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Correspondence to Eita Shoji.

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Manuscript submitted May 16, 2017.

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Nakamura, Y., Takahashi, R., Shoji, E. et al. Thermal Conductivity Measurement of Molten Cu-Co Alloy Using an Electromagnetic Levitator Superimposed with a Static Magnetic Field. Metall Mater Trans B 48, 3213–3218 (2017). https://doi.org/10.1007/s11663-017-1103-9

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  • DOI: https://doi.org/10.1007/s11663-017-1103-9

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