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http://dx.doi.org/10.4150/KPMI.2010.17.6.482

Phase Transformation and Microstructure of FeSi2 Thermoelectric Compounds Manufactured by Powder Metallurgy  

Park, Kyoung-Tae (Graduate School of Green Energy Technology, Chungnam National University)
Shin, Jin-Gyo (Agency for Depense development)
Hong, Soon-Jik (Division of Advanced Materials Engineering & Institute for Rare Metals Kongju National University)
Chun, Byong-Sun (Department of metallurgical engineering, Chungnam National University)
Publication Information
Journal of Powder Materials / v.17, no.6, 2010 , pp. 482-488 More about this Journal
Abstract
In this study, $FeSi_2$ as high temperature performance capable thermoelectric materials was manufactured by powder metallurgy.The as-casted Fe-Si alloy was annealed for homogenization below $1200^{\circ}C$ for 3 h. Due to its high brittleness, the cast alloy transformed to fine powders by ball-milling, followed by subsequent compaction (hydraulic pressure; 2 GPa) and sintering ($1200^{\circ}C$, 12 h). In order to precipitate ${\beta}-FeSi_2$, heat treatment was performed at $850^{\circ}C$ with varying dwell time (7, 15 and 55 h). As a result of this experiment thermoelectric phase ${\beta}-FeSi_2$ was quickly transformed by powder metallurgical process. There was not much change in powder factor between 7h and 55h specimens.
Keywords
Powder Metallurgy (PM); Thermoelectric Material; ${\beta}-FeSi_2$; Power factor;
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Times Cited By KSCI : 1  (Citation Analysis)
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