62 0

Low Temperature Isothermal Reduction Kinetics of Fe2O3/NiO Mixed Oxides and Comparative Synthesis of Fe1-xNix Alloys

Title
Low Temperature Isothermal Reduction Kinetics of Fe2O3/NiO Mixed Oxides and Comparative Synthesis of Fe1-xNix Alloys
Author
박종진
Keywords
Fe2O3/NiO; H-2-reduction; nanocrystallites; iron-nickel alloy; fcc-alloy; bcc-alloy
Issue Date
2008-02
Publisher
JAPAN INST METALS
Citation
MATERIALS TRANSACTIONS, v. 49, No. 2, Page. 352-359
Abstract
Two Molar ratios 1 : 1 and 1 : 2 of AR grade nickel oxide and iron oxide powder was mixed and compacted. The fired compacts were isothermally reduced in pure hydrogen at 500, 550, 600 and 650 degrees C. Based on thermogravimetric analysis, the reduction behavior and kinetics reaction mechanism were studied comparatively for the different mixed oxides ratios. The initial fired powder and the various reduction products were characterized by XRD, SEM, TEM and reflected light microscope to reveal the effect of hydrogen reduction on composition and microstructure of produced Ferronickel alloy. Synthesis of nanocrystalline Fe1-xNix alloy with 33 and 20 at% Ni for reduction of 1 : 1 and 1 : 2 NiO/Fe2O3 ratios was detected respectively. The activation energy values were calculated from Arrhenius equation and the approved mathematical formulations for the gas solid reaction were applied. It was found that for NiO/Fe2O3 of both 1 : 1 and 1 : 2 ratios, the initial reduction stages is controlled by the combined gaseous diffusion and interfacial chemical reaction mechanisms while at the final reduction stages the reaction is controlled by the interfacial chemical reaction mechanism.
URI
https://www.jstage.jst.go.jp/article/matertrans/49/2/49_MRA2007203/_article/-char/ja/https://repository.hanyang.ac.kr/handle/20.500.11754/104343
ISSN
1345-9678
DOI
10.2320/matertrans.MRA20072031
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE