Kinetics of the oxidation of an electroexplosion iron nanopowder during heating in air

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Abstract

The regularities of the oxidation of electroexplosion iron nanopowder, produced by the wire electric explosion, heated in air under conditions of linearly increasing temperature and in the isothermal mode are examined. The oxidation process under conditions of linear heating is demonstrated to occur stepwise due to the combined influence of the fractional composition of the powder, its phase composition, and the structure of the oxide layer formed on the surface of the particles. It is shown that, under isothermal conditions (250-600°C), the oxidation of the nanopowder, as opposed to micron-sized powders, obeys a linear law and proceeds in the kinetic regime with E a = 100 ± 7 kJ/mol. The conditions of thermogravimetry analysis at which the thermal self-ignition of the nanopowder occurs are determined. Based on the numerical evaluation of the sample surface heating parameter, the experimentally measured critical temperature is verified.

Original languageEnglish
Pages (from-to)368-375
Number of pages8
JournalRussian Journal of Physical Chemistry B
Volume6
Issue number3
DOIs
Publication statusPublished - May 2012

Keywords

  • Coarse-grained and nanosized powders
  • Iron
  • Oxidation in air
  • Thermal self-ignition
  • Thermogravimetry

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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