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 language | English |
|---|---|
| Pages (from-to) | 368-375 |
| Number of pages | 8 |
| Journal | Russian Journal of Physical Chemistry B |
| Volume | 6 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - May 2012 |
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Keywords
- Coarse-grained and nanosized powders
- Iron
- Oxidation in air
- Thermal self-ignition
- Thermogravimetry
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
Cite this
Kinetics of the oxidation of an electroexplosion iron nanopowder during heating in air. / Korshunov, A. V.
In: Russian Journal of Physical Chemistry B, Vol. 6, No. 3, 05.2012, p. 368-375.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Kinetics of the oxidation of an electroexplosion iron nanopowder during heating in air
AU - Korshunov, A. V.
PY - 2012/5
Y1 - 2012/5
N2 - 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.
AB - 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.
KW - Coarse-grained and nanosized powders
KW - Iron
KW - Oxidation in air
KW - Thermal self-ignition
KW - Thermogravimetry
UR - http://www.scopus.com/inward/record.url?scp=84869177215&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84869177215&partnerID=8YFLogxK
U2 - 10.1134/S1990793112050053
DO - 10.1134/S1990793112050053
M3 - Article
VL - 6
SP - 368
EP - 375
JO - Russian Journal of Physical Chemistry B
JF - Russian Journal of Physical Chemistry B
SN - 1990-7931
IS - 3
ER -