Abstract

The oxidation kinetics of ultrafine metallic iron powder to hematite (α-Fe2O3) up to temperatures 800 C were studied in air using non-isothermal and isothermal thermogravimetric (TG) analysis. The powders with average particles size of 90, 200, and 350 nm were made by the electric explosion of wire. It was observed that the reactivity of the iron powder is increased with the decreasing particle size of powder. The experimental TG curves clearly suggest a multi-step process for the oxidation, and therefore a model-fitting kinetic analysis based on multivariate non-linear regressions was conducted. The complex reaction can be best described with a three-step reaction scheme consisting of two concurrent and one parallel reaction step. In one reaction pathway Fe is oxidized to α-Fe 2O3. The other pathway is described by the oxidation of Fe to magnetite (Fe3O4). At higher temperatures the formed Fe3O4 is further oxidized in a α-Fe 2O3. It is established that the best fitting three-step mechanism employed a branching set of n-order equations for each step.

Original languageEnglish
Pages (from-to)1447-1452
Number of pages6
JournalJournal of Thermal Analysis and Calorimetry
Volume115
Issue number2
DOIs
Publication statusPublished - 1 Feb 2014

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Iron powder
Thermogravimetric analysis
iron
Oxidation
Powders
oxidation
Kinetics
kinetics
Particle size
Ferrosoferric Oxide
Explosions
Wire
hematite
Temperature
magnetite
explosions
regression analysis
Air
reactivity
Ultrafine

Keywords

  • Electric explosion of wire
  • Oxidation kinetic
  • TG method
  • Ultrafine iron powders

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics

Cite this

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title = "The oxidation kinetics study of ultrafine iron powders by thermogravimetric analysis",
abstract = "The oxidation kinetics of ultrafine metallic iron powder to hematite (α-Fe2O3) up to temperatures 800 C were studied in air using non-isothermal and isothermal thermogravimetric (TG) analysis. The powders with average particles size of 90, 200, and 350 nm were made by the electric explosion of wire. It was observed that the reactivity of the iron powder is increased with the decreasing particle size of powder. The experimental TG curves clearly suggest a multi-step process for the oxidation, and therefore a model-fitting kinetic analysis based on multivariate non-linear regressions was conducted. The complex reaction can be best described with a three-step reaction scheme consisting of two concurrent and one parallel reaction step. In one reaction pathway Fe is oxidized to α-Fe 2O3. The other pathway is described by the oxidation of Fe to magnetite (Fe3O4). At higher temperatures the formed Fe3O4 is further oxidized in a α-Fe 2O3. It is established that the best fitting three-step mechanism employed a branching set of n-order equations for each step.",
keywords = "Electric explosion of wire, Oxidation kinetic, TG method, Ultrafine iron powders",
author = "Lysenko, {E. N.} and Surzhikov, {Anatoly Petrovich} and Zhuravkov, {S. P.} and Vlasov, {V. A.} and Pustovalov, {A. V.} and Yavorovsky, {N. A.}",
year = "2014",
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pages = "1447--1452",
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T1 - The oxidation kinetics study of ultrafine iron powders by thermogravimetric analysis

AU - Lysenko, E. N.

AU - Surzhikov, Anatoly Petrovich

AU - Zhuravkov, S. P.

AU - Vlasov, V. A.

AU - Pustovalov, A. V.

AU - Yavorovsky, N. A.

PY - 2014/2/1

Y1 - 2014/2/1

N2 - The oxidation kinetics of ultrafine metallic iron powder to hematite (α-Fe2O3) up to temperatures 800 C were studied in air using non-isothermal and isothermal thermogravimetric (TG) analysis. The powders with average particles size of 90, 200, and 350 nm were made by the electric explosion of wire. It was observed that the reactivity of the iron powder is increased with the decreasing particle size of powder. The experimental TG curves clearly suggest a multi-step process for the oxidation, and therefore a model-fitting kinetic analysis based on multivariate non-linear regressions was conducted. The complex reaction can be best described with a three-step reaction scheme consisting of two concurrent and one parallel reaction step. In one reaction pathway Fe is oxidized to α-Fe 2O3. The other pathway is described by the oxidation of Fe to magnetite (Fe3O4). At higher temperatures the formed Fe3O4 is further oxidized in a α-Fe 2O3. It is established that the best fitting three-step mechanism employed a branching set of n-order equations for each step.

AB - The oxidation kinetics of ultrafine metallic iron powder to hematite (α-Fe2O3) up to temperatures 800 C were studied in air using non-isothermal and isothermal thermogravimetric (TG) analysis. The powders with average particles size of 90, 200, and 350 nm were made by the electric explosion of wire. It was observed that the reactivity of the iron powder is increased with the decreasing particle size of powder. The experimental TG curves clearly suggest a multi-step process for the oxidation, and therefore a model-fitting kinetic analysis based on multivariate non-linear regressions was conducted. The complex reaction can be best described with a three-step reaction scheme consisting of two concurrent and one parallel reaction step. In one reaction pathway Fe is oxidized to α-Fe 2O3. The other pathway is described by the oxidation of Fe to magnetite (Fe3O4). At higher temperatures the formed Fe3O4 is further oxidized in a α-Fe 2O3. It is established that the best fitting three-step mechanism employed a branching set of n-order equations for each step.

KW - Electric explosion of wire

KW - Oxidation kinetic

KW - TG method

KW - Ultrafine iron powders

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