MA/SPS 공정에 의한 β-FeSi 2 열전재료의 제조(I) - β-FeSi 2 상의 형성 -

김환태; 권영순; 이충효; Hwan-Tae Kim; Young-Soon Kwon; Chung-Hyo Lee

Korean Journal of Materials Research, Vol.12, No.3, 176-181, March, 2002

DOI10.3740/MRSK.2002.12.3.176 Export Citation

MA/SPS 공정에 의한 β-FeSi 2 열전재료의 제조(I) - β-FeSi 2 상의 형성 -

Preparation of β-FeSi 2 Thermoelectric Materials by MA/SPS Process - Formation ofβ-FeSi 2 Phase -

김환태^†, 권영순, 이충효¹

울산대학교 기계부품 및 소재 특성평가연구센터
¹목포대학교 신소재공학과

Hwan-Tae Kim^†, Young-Soon Kwon, and Chung-Hyo Lee¹

Research Center for Machine Parts and Materials Processing, University of Ulsan, Ulsan 680-749, Korea
¹Dept. of Advanced Materials Science and Engineering, Mokpo National Unviersity, Muan 534-729, Korea

E-mail:

Fabrication of β?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 ? 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 ε -FeSi and Si phases. When this mechanically alloyed powder was sintered by SPS process above 85 0 ? C , ε -FeSi and α?Fe 2 Si 5 phase were formed. Bulk product sintered at 82 0 ? C for 30min consisted of beta?FeSi 2 phase with a small fraction of ε -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 β?FeSi 2 without heat treatment process after sintering.

Keywords:mechanical alloying;spark plasma sintering (SPS);β - FeSi 2;ε -FeSi

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