A shock-tube study of the kinetics of evaporation and oxidation of magnesium

Oxidation kinetics of magnesium have been studied by shock heating dilute magnesium aerosol suspended in argonoxygen and argon-air carrier gas to gas temperatures of around 2000°K. Magnesium vapour profiles have been recorded using atomic absorption spectrometry. Oxidation of magnesium occurs via a...

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Bibliographic Details
Published in:Combustion and flame 1979-01, Vol.35, p.323-334
Main Authors: Hodgson, A., Mackie, J.C.
Format: Article
Language:English
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Summary:Oxidation kinetics of magnesium have been studied by shock heating dilute magnesium aerosol suspended in argonoxygen and argon-air carrier gas to gas temperatures of around 2000°K. Magnesium vapour profiles have been recorded using atomic absorption spectrometry. Oxidation of magnesium occurs via a homogeneous gas-phase reaction Mg+ O 2⇌ MgO+ O , and the rate coefficient for oxidation has been measured as (5 ± 3) × 10 10 cm 3 mole −1 sec −1 at 2000°K. The evaporation rate of particulate magnesium has been determined by shocking the aerosol in pure argon, and the rate has been measured by both light-extinction and atomic-absorption techniques. The evaporation rate can be expressed in terms of a simple first-order evaporation-rate coefficient k 1 = (3 ± 1.5) × 10 4 sec −1. This value is suggestive of a surface oxide coating on the magnesium particles.
ISSN:0010-2180
1556-2921
DOI:10.1016/0010-2180(79)90037-3