HIP法によるFeSi2熱電素子の作成

概要

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FeSi2 thermoelectric generator was prepared by Hot Isostatic Pressing (HIP). Mixture of Fe and Si powders was melted at 1350°C to form metallic phases of α-Fe2Si5 and ε-FeSi. After powdering process, Hipping was performed at 840-960°C for 30min under 10-100MPa. In the temperature range of 840-960°C, the metallic phases of α-Fe2Si5 and ε-FeSi were simultaneously transformed into the β-FeSi2. The suitable conditions for the densification and the transformation was decided as follows, temperature: 900°C, pressure: 5OMPa, time: 30min. The thermoelectric generator with PN junction was prepared under these conditions, doping 3at% of Mn for P-type and lat% of Co for N-type. At a temperature difference of 640°C between the junctions, the open circuit voltage was 300mV and the maximum power output was 13mW.
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