Thermoelectric Properties of Nearly Single-Phase β-FeSi<sub>2</sub> Alloys Fabricated by Gas-Atomized Powder Sintering

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  • Kimura Yoshisato
    School of Materials and Chemical Technology, Department of Materials Science and Engineering, Tokyo Institute of Technology Interdisciplinary Graduate School of Science and Engineering, Department of Materials Science and Engineering, Tokyo Institute of Technology
  • Yamada Masashi
    Interdisciplinary Graduate School of Science and Engineering, Department of Materials Science and Engineering, Tokyo Institute of Technology
  • Chai Yaw Wang
    School of Materials and Chemical Technology, Department of Materials Science and Engineering, Tokyo Institute of Technology Interdisciplinary Graduate School of Science and Engineering, Department of Materials Science and Engineering, Tokyo Institute of Technology

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  • Thermoelectric Properties of Nearly Single-Phase β-FeSi₂ Alloys Fabricated by Gas-Atomized Powder Sintering

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Abstract

<p>Thermoelectric alloys having nearly β-FeSi2 single-phase microstructure were fabricated by sintering gas-atomized powders using the hot pressing. Since the β-FeSi2 phase is formed by the peritectoid reaction between ε-FeSi and α-Fe2Si5 phases, the reaction rate for the completion of β-FeSi2 phase transition strongly depends on the diffusion path length which is governed by the morphology and size of solidified microstructure consisting of ε and α phases. It has been indicated by the wedge drop cast using arc melting that producing fine and fully eutectic microstructure by rapid solidification is quite effective for the completion of β-FeSi2 phase transition. An argon gas atomization process was chosen as a rapid solidification technique to produce fine and homogeneous alloy powder having fully ε and α eutectic microstructure, which was turned out to be beneficial for the formation of β-FeSi2 single-phase microstructure by a short time annealing even within 30 minutes at 1073 K for the gas-atomized powders with the averaged particles size of 20 µm and under in diameter. Thermoelectric properties were evaluated for these nearly single-phase β-FeSi2 sintered alloys with the addition of doping elements, n-type Co and p-type Mn, 1.67 at% respectively. The absolute value of Seebeck coefficient and electrical conductivity are higher in a p-type Mn alloy than an n-type Co alloy.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 60 (5), 652-661, 2019-05-01

    The Japan Institute of Metals and Materials

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