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Hydrogen Reduction of Fe2O3/WO3 Mixture with Synthesis of Nanocrystalline Fe/W Composite

Title
Hydrogen Reduction of Fe2O3/WO3 Mixture with Synthesis of Nanocrystalline Fe/W Composite
Author
박종진
Keywords
tungsten composite; iron/tungsten nano-crystalline composite; gaseous reduction; reduction kinetics; magnetic properties
Issue Date
2008-06
Publisher
JAPAN INST METALS
Citation
MATERIALS TRANSACTIONS, v. 49, No. 6, Page. 1480-1485
Abstract
Nanocrystalline Fe-W composite is synthesized through the reduction of iron oxide/tungsten oxide (Fe2O3/WO3) mixture with pure hydrogen gas at 700-1000 degrees C. AR grade Fe2O3 and WO3 powders were mixed thoroughly in ball mill and compacted. The dried compacts were isothermally reduced in pure hydrogen at 700, 800, 900 and 1000 degrees C. Based on thermogravimetric analysis, the reduction behavior and kinetics reaction mechanism were studied. The initial oxides mixture and the various reduction products were characterized by XRD, SEM, VSM and reflected light microscope to reveal the effect of hydrogen reduction on microstructure, magnetic properties and reaction kinetics of produced Fe-W composite. Complete reduction was achieved with the synthesis of nanocrystalline (36.3 nm) homogenous Fe-W composite. Arrhenius equation with the approved mathematical formulations for the gas solid reaction was applied for the calculation of the activation energy values and detecting the controlling reaction mechanism.
URI
https://www.jstage.jst.go.jp/article/matertrans/49/6/49_MER2008039/_article/-char/ja/https://repository.hanyang.ac.kr/handle/20.500.11754/104690
ISSN
1345-9678
DOI
10.2320/matertrans.MER2008039
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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