The oxidation kinetic study of mechanically milled ultrafine iron powders by thermogravimetric analysis

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Abstract

The effect of mechanical milling on the oxidation kinetics of ultrafine iron powders was investigated by thermogravimetric (TG) analysis. The initial α-Fe powder with average particles size of 100 nm was made by the electric explosion of wire. The milling of iron powder was carried out by AGO-2S planetary ball mill using a rotation speed of 2220 rpm and the milling times of 15 and 40 min. According to the XRD data, the main content of α-Fe was observed in all samples. However, a certain amount (~ 20 mass%) of wustite phase (FeO) is formed after ball milling of ultrafine iron powders. From TG analysis, the powders milling leads to increase in the temperature of thermal oxidation onset and shifts the reaction to higher temperatures. A model-free isoconversional method of the Friedman analysis was employed only in a first qualitative approximation. More accurate kinetics parameters were obtained using the multivariate nonlinear regressions, where three-step reaction with branching set of n-order equations for each step was chosen.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalJournal of Thermal Analysis and Calorimetry
DOIs
Publication statusAccepted/In press - 4 Jun 2018

Fingerprint

Iron powder
Thermogravimetric analysis
iron
Oxidation
Powders
oxidation
Kinetics
kinetics
Ball mills
Ball milling
balls
Kinetic parameters
Explosions
Particle size
Wire
Temperature
explosions
regression analysis
Ultrafine
wire

Keywords

  • Mechanical milling
  • Oxidation kinetic
  • Thermogravimetric analysis
  • Ultrafine iron powders

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

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title = "The oxidation kinetic study of mechanically milled ultrafine iron powders by thermogravimetric analysis",
abstract = "The effect of mechanical milling on the oxidation kinetics of ultrafine iron powders was investigated by thermogravimetric (TG) analysis. The initial α-Fe powder with average particles size of 100 nm was made by the electric explosion of wire. The milling of iron powder was carried out by AGO-2S planetary ball mill using a rotation speed of 2220 rpm and the milling times of 15 and 40 min. According to the XRD data, the main content of α-Fe was observed in all samples. However, a certain amount (~ 20 mass{\%}) of wustite phase (FeO) is formed after ball milling of ultrafine iron powders. From TG analysis, the powders milling leads to increase in the temperature of thermal oxidation onset and shifts the reaction to higher temperatures. A model-free isoconversional method of the Friedman analysis was employed only in a first qualitative approximation. More accurate kinetics parameters were obtained using the multivariate nonlinear regressions, where three-step reaction with branching set of n-order equations for each step was chosen.",
keywords = "Mechanical milling, Oxidation kinetic, Thermogravimetric analysis, Ultrafine iron powders",
author = "Lysenko, {Elena N.} and Surzhikov, {Anatoly P.} and Nikolaev, {Evgeniy V.} and Vlasov, {Vitaly A.} and Zhuravkov, {Sergey P.}",
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AU - Lysenko, Elena N.

AU - Surzhikov, Anatoly P.

AU - Nikolaev, Evgeniy V.

AU - Vlasov, Vitaly A.

AU - Zhuravkov, Sergey P.

PY - 2018/6/4

Y1 - 2018/6/4

N2 - The effect of mechanical milling on the oxidation kinetics of ultrafine iron powders was investigated by thermogravimetric (TG) analysis. The initial α-Fe powder with average particles size of 100 nm was made by the electric explosion of wire. The milling of iron powder was carried out by AGO-2S planetary ball mill using a rotation speed of 2220 rpm and the milling times of 15 and 40 min. According to the XRD data, the main content of α-Fe was observed in all samples. However, a certain amount (~ 20 mass%) of wustite phase (FeO) is formed after ball milling of ultrafine iron powders. From TG analysis, the powders milling leads to increase in the temperature of thermal oxidation onset and shifts the reaction to higher temperatures. A model-free isoconversional method of the Friedman analysis was employed only in a first qualitative approximation. More accurate kinetics parameters were obtained using the multivariate nonlinear regressions, where three-step reaction with branching set of n-order equations for each step was chosen.

AB - The effect of mechanical milling on the oxidation kinetics of ultrafine iron powders was investigated by thermogravimetric (TG) analysis. The initial α-Fe powder with average particles size of 100 nm was made by the electric explosion of wire. The milling of iron powder was carried out by AGO-2S planetary ball mill using a rotation speed of 2220 rpm and the milling times of 15 and 40 min. According to the XRD data, the main content of α-Fe was observed in all samples. However, a certain amount (~ 20 mass%) of wustite phase (FeO) is formed after ball milling of ultrafine iron powders. From TG analysis, the powders milling leads to increase in the temperature of thermal oxidation onset and shifts the reaction to higher temperatures. A model-free isoconversional method of the Friedman analysis was employed only in a first qualitative approximation. More accurate kinetics parameters were obtained using the multivariate nonlinear regressions, where three-step reaction with branching set of n-order equations for each step was chosen.

KW - Mechanical milling

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KW - Thermogravimetric analysis

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