熱電変換素子用クロメル/アルメル多孔質焼結接合体の作製と熱電特性

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タイトル別名
  • Preparation and Thermoelectric Properties of Joint of Chromel/Alumel Porous Sintered Compacts for Thermoelectric Transducer
  • ネツデン ヘンカン ソシヨウ クロメル アルメル タコウシツ ショウケツ セツ

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抄録

The miniaturization of a thermoelectric generator of gas combustion type requires a sharp temperature gradient between hot and cold junctions. It has been proposed by R. Echigo that this could be achieved by flowing a mixture of inflammable gas and air through the continuous coarse pores of a porous thermoelectric transducer and burning it at the outlet. The present article describes the preparation and thermoelectric properties of chromel/alumel porous sintered compact for the thermoelectric transducer. The average particle sizes of both chromel and alumel coarse powders were about 300 μm.<BR>Under the conditions of the relative density of green compact of 70%, sintering atmosphere of vacuum (10−3 Pa), sintering temperature of 1623 K and sintering time of 3.6∼14.4 ks, porous chromel and alumel sintered compacts having the following properties were obtained; continuous pores (porosity, 30%; relative density, 70%), appropriate mechanical property (bending strength at room temperature, above 90 MPa), specific electrical conductivity of about 2.5∼3.6×105 S·m−1 (ratios to the value of dense compact are about 17∼24%) and 10∼15×105 S·m−1 (23∼35%), respectively, and thermal conductivity of 7.1∼10 Wm−1 K−1 (23∼32%) and 13∼16 Wm−1 K−1 (32∼39%). And the porous thermoelectric transducer, i.e., joint of the two kinds of the sintered compacts having thermoelectric power of 4.2∼4.3×10−2 mV·K−1 (100%) and figure of merit of 2.2∼2.6×10−5 K−1 (76∼90%) were obtained under the same conditions.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 60 (3), 311-317, 1996

    公益社団法人 日本金属学会

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