P형 Fe(Mn)Si₂ 열전재료 분말의 성형 및 미세조직
Consolidation of p-type Fe(Mn)Si₂ Thermoelectric Powder and Microstructure
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Abstract
The effects of the dopant (Mn) ratio on the microstructure and thermoelectric properties of FeSi₂ alloy were studied in this research. The alloy was fabricated by a combination process of ball milling and high pressure pressing. Structural behavior of the sintered bulks were systematically investigated by XRD, SEM, and optical microscopy. With increasing dopant (Mn) ratio, the density and e-FeSi phase of the sintered bulks increased and maximum density of 94% was obtained in the 0.07% Mn-doped alloy. The sintered bulks showed fine microstructue of α-Fe₂Si5, ε-FeSi and β-FeSi₂phase. The semiconducting phase of β-FeSi₂was transformed from α-Fe₂Si5+ε-FeSi phase by annealing.
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