液相-固相反応法とパルス放電焼結法を用いて作製したMg<sub>2</sub>Si の焼結性と 熱電特性に及ぼすAl 添加の影響

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タイトル別名
  • Influence of Aluminum Addition on Sinterability and Thermoelectric Properties of Mg<sub>2</sub>Si Compound Prepared Using Liquid-solid Phase Reaction Method and Pulse Discharge Sintering
  • 液相-固相反応法とパルス放電焼結法を用いて作製したMg₂Siの焼結性と熱電特性に及ぼすAl添加の影響
  • エキソウ-コソウ ハンノウホウ ト パルス ホウデン ショウケツホウ オ モチイテ サクセイ シタ Mg ₂ Si ノ ショウケツセイ ト ネツデントクセイ ニ オヨボス Al テンカ ノ エイキョウ
  • Influence of Aluminum Addition on Sinterability and Thermoelectric Properties of Mg2Si Compound Prepared Using Liquid-solid Phase Reaction Method and Pulse Discharge Sintering

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抄録

Mg2Si compound is a promising material available for thermoelectric power generation using waste heat of temperature range of 600 to 900 K. However, high vapor pressure of molten Mg makes difficulties in synthesis of Mg2Si compound and in sintering. In order to overcome these problems, we synthesized the Mg2Si compound under Mg–rich condition by the liquid-solid phase reaction and sintered the synthesized powder by the pulse discharge sintering. In this study, we attempted to add aluminum of 0−2.0 at.% to the Mg2Si and investigated the influence of addition of aluminum on sinterability and thermoelectric properties. Addition of Al brought to improvement of the sinterability and reduction of the electrical resistivity. The 1.0 at.% Al–added sample had the maximum dimensionless figure of merit of 0.86 at 873K.

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