Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Hydrogen Reduction Behavior of Oxide Scale in Water-atomized Iron Powder

수분사 Fe 분말의 산화물 및 이의 수소가스 환원거동

  • Shin, Hea-Min (Department of Nanomaterials Engineering, Chungnam National University) ;
  • Baik, Kyeong-Ho (Department of Nanomaterials Engineering, Chungnam National University)
  • 신해민 (충남대학교 나노소재공학과) ;
  • 백경호 (충남대학교 나노소재공학과)
  • Received : 2014.10.08
  • Accepted : 2014.12.01
  • Published : 2014.12.28
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Abstract

In this study, the reduction kinetics and behaviors of oxides in the water-atomized iron powder have been evaluated as a function of temperature ranging $850-1000^{\circ}C$ in hydrogen environment, and compared to the reduction behaviors of individual iron oxides including $Fe_2O_3$, $Fe_3O_4$ and FeO. The water-atomized iron powder contained a significant amount of iron oxides, mainly $Fe_3O_4$ and FeO, which were formed as a partially-continuous surface layer and an inner inclusion. During hydrogen reduction, a significant weight loss in the iron powder occurred in the initial stage of 10 min by the reduction of surface oxides, and then further reduction underwent slowly with increasing time. A higher temperature in the hydrogen reduction promoted a high purity of iron powder, but no significant change in the reduction occurred above $950^{\circ}C$. Sequence reduction process by an alternating environment of hydrogen and inert gases effectively removed the oxide scale in the iron powder, which lowered reduction temperature and/or shortened reduction time.

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