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http://dx.doi.org/10.4150/KPMI.2004.11.4.308

Kinetic and Thermodynamic Features of Combustion of Superfine Aluminum Powders in Air  

Kwon, Young-Soon (Research Center for Machine Parts and Materials Processing, School of Materials and Metallurgical Engineering, University of Ulsan)
Park, Pyuck-Pa (Research Center for Machine Parts and Materials Processing, School of Materials and Metallurgical Engineering, University of Ulsa)
Kim, Ji-Soon (Research Center for Machine Parts and Materials Processing, School of Materials and Metallurgical Engineering, University of Ulsa)
Gromov, Alexander (Tomsk Polytechnic University)
Rhee, Chang-Kyu (Korea Atomic Energy Research Institute, Nuclear Materials Development Team)
Publication Information
Journal of Powder Materials / v.11, no.4, 2004 , pp. 308-313 More about this Journal
Abstract
An experimental study on the combustion of superfine aluminum powders (average particle diameter, a$_{s}$: ∼0.1 ${\mu}{\textrm}{m}$) in air is reported. The formation of aluminum nitride during the combustion of aluminum in air and the influence of the combustion scenario on the structures and compositions of the final products are in the focus of this study. The experiments were conducted in an air (pressure: 1 atm). Superfine aluminum powders were produced by the wire electrical explosion method. Such superfine aluminum powder is stable in air but once ignited it can burn in a self-sustaining way due to its low bulk: density (∼0.1 g/㎤) and a low thermal conductivity. During combustion, the temperature and radiation were measured and the actual burning process was recorded by a video camera. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and chemical analysis were performed on the both initial powders and final products. It was found that the powders, ignited by local heating, burned in a two-stage self-propagating regime. The products of the first stage consisted of unreacted aluminum (-70 mass %) and amorphous oxides with traces of AlN. After the second stage the AlN content exceeded 50 mass % and the residual Al content decreased to ∼10 mass %. A qualitative discussion is given on the kinetic limitation for AlN oxidation due to rapid condensation and encapsulation of gaseous AlN.N.
Keywords
Superfine aluminum powder; Combustion; Electric explosion of wire oxidizer;
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