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http://dx.doi.org/10.3740/MRSK.2007.17.3.132

Oxidation Resistance of SPS (Spark Plasma Sintering) Sintered β-FeSi2Bodies at High Temperature  

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)
Publication Information
Korean Journal of Materials Research / v.17, no.3, 2007 , pp. 132-136 More about this Journal
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.
Keywords
Spark Plasma Sintering; ${\beta}-FeSi_{2}$; ${\varepsilon}-FeSi$; Oxidation resistant;
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