분말야금법으로 제조된 FeSi2 열전특성 화합물의 열처리 시간에 따른 미세조직과 상변화
Phase Transformation and Microstructure of FeSi2 Thermoelectric Compounds Manufactured by Powder Metallurgy
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In this study, FeSi2 as high temperature performance capable thermoelectric materials was manufactured by powder metallurgy.The as-casted Fe-Si alloy was annealed for homogenization below 1200˚C for 3h. 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˚C, 12 h). In order to precipitate β-FeSi2, heat treatment was performed at 850˚C with varying dwell time (7, 15 and 55 h). As a result of this experiment thermoelectric phase β-FeSi2 was quickly transformed by powder metallurgical process. There was not much change in powder factor between 7h and 55h specimens.
Abstract
In this study, FeSi2 as high temperature performance capable thermoelectric materials was manufactured by powder metallurgy.The as-casted Fe-Si alloy was annealed for homogenization below 1200˚C for 3h. 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˚C, 12 h). In order to precipitate β-FeSi2, heat treatment was performed at 850˚C with varying dwell time (7, 15 and 55 h). As a result of this experiment thermoelectric phase β-FeSi2 was quickly transformed by powder metallurgical process. There was not much change in powder factor between 7h and 55h specimens.
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