Thermoelectric (TE) power generation from waste heat is recently attracted much attention as one of energy-saving technologies. From a large quantity of waste heat from a incinerate or steel factory, several tens or hundreds kW-class power generation may be possible if the TE device can be produced with large heat exchange area by low cost. In this study, FeSi_2 device, being capable to generate power at middle to high temperatures over 300°C, was produced by thermal spraying process. Thermal spraying was already applied to form TE device [1, 2], but most cases multi-layer device was fabricated. Repeated deposition processes for n- and p-type semiconductors, however, will make a TE device made by such process very expensive. A large-size TE device with either n-type or p-type semiconductor β-FeSi_2 and a serial connection with these devices may realize a cost-competitive TE power generation system with simple design.
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