Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Oxidation Resistance of SPS (Spark Plasma Sintering) Sintered β-FeSi2Bodies at High Temperature

방전플라즈마 소결법으로 제작한 β-FeSi2 소결체의 고온 내산화성

  • Chang, Se-Hun (Korea Institute of Industrial Technology (KITECH), Gwangju Research Center) ;
  • Hong, Ji-Min (Korea Institute of Industrial Technology (KITECH), Gwangju Research Center) ;
  • Oh, Ik-Hyun (Korea Institute of Industrial Technology (KITECH), Gwangju Research Center)
  • 장세훈 (한국생산기술연구원 광주연구센터) ;
  • 홍지민 (한국생산기술연구원 광주연구센터) ;
  • 오익현 (한국생산기술연구원 광주연구센터)
  • Published : 2007.03.27
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Abstract

Oxidation resistance of sintered ${\beta}-FeSi_{2}$ was investigated at intermediate temperature range in air atmosphere. Fully dense and porous bodies of ${\beta}-FeSi_{2}$ samples were fabricated by using the Spark Plasma Sintering (SPS). They were annealed at $900^{\circ}C$ for 5days to obtain ${\beta}-FeSi_{2}$ phase. The bulk samples were oxidized at $800,\;900\;and\;950^{\circ}C$ in air atmosphere. The high temperature oxidation tests reveal that amorphous $SiO_{2}$ layer, similar to Si was formed and grew parabolically on ${\beta}-FeSi_{2}$. Accelerated oxidation is not observed as well as cracks and grain boundary oxidation. Granular ${\varepsilon}-FeSi$ was developed below the oxide layer as a result of oxidation of ${\beta}-FeSi_{2}$. Oxidation resistance of sintered ${\beta}-FeSi_{2}$ was excellent for high-temperature thermoelectric application.

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References

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