Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Preparation of β-FeSi2 Thermoelectric Materials by MA/SPS Process -Formation ofβ-FeSi2Phase-

MA/SPS 공정에 의한 β-FeSi2 열전재료의 제조(I) -β-FeSi2상의 형성-

  • Kim, Hwan-Tae (Research Center for Machine Parts and Materials Processing, University of Ulsan) ;
  • Gwon, Yeong-Sun (Research Center for Machine Parts and Materials Processing, University of Ulsan) ;
  • Lee, Chung-Hyo (Dept. of Advanced Materials Science and Engineering, Mokpo National Unviersity)
  • 김환태 (울산대학교 기계부품 및 소재 특성평가연구센터) ;
  • 권영순 (울산대학교 기계부품 및 소재 특성평가연구센터) ;
  • 이충효 (목포대학교 신소재공학과)
  • Published : 2002.03.01
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Abstract

Fabrication of ${\beta}-FeSi_2$ was attempted by making use of the combined process of mechanical alloying (MA) and spark plasma sintering (SPS). MA was performed under the Ar gas atmosphere using mixed powders of pure iron and silicon having the mole fraction of 1:2. SPS process was performed at 800-85$0^{\circ}C$ with the applied pressure of 50MPa and the holding time was ranging from 0 to 30min. The mechanically alloyed powder by cyclic operation of rotor for 15hrs consisted of $\varepsilon$-FeSi and Si phases. When this mechanically alloyed powder was sintered by SPS process above 85$0^{\circ}C$, $\varepsilon$-FeSi and ${\alpha}-Fe_2Si_5$ phase were formed. Bulk product sintered at 82$0^{\circ}C$ for 30min consisted of ${beta}-FeSi_2$ phase with a small fraction of $\varepsilon$-FeSi and the density of sintered specimen was 75.3% theoretical density. It was considered that the MA/SPS combined process was effective for the preparation of ${\beta}-FeSi_2$ without heat treatment process after sintering.

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References

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