Morphology of Aluminum Nanopowder Combustion Products in a Magnetic Field in Air

• Published in: Key Engineering Materials Vol. 685; pp. 516 - 520
• Main Authors: Ilyin, Alexander P., Mostovshchikov, Andrei V., Zabrodina, Irina K.
• Format: Journal Article
• Language: English
• Published: Zurich Trans Tech Publications Ltd 01.02.2016
• Subjects: Aluminum; Combustion; Combustion products; Crystal structure; Crystals; Magnetic fields; Magnetic induction; Nanostructure; Monocrystals; Mass Transfer; Aluminum Nanopowder; Aluminum Nitride; Oxidation; Phase Transition; Magnetic Field; Burning
• ISBN: 3038357081; 9783038357087
• ISSN: 1013-9826; 1662-9795; 1662-9795
• DOI: 10.4028/www.scientific.net/KEM.685.516

The microstructure of aluminum nanopowder combustion crystalline products in air and the influence of a constant magnetic field (with induction of 0.3 T) on their structures have been studied. It was revealed that in the combustion products of free-poured aluminum nanopowder two-level whiskers are present. Hexagonal single crystals are formed by combustion in air in a homogeneous magnetic field, and in case of inhomogeneous magnetic field (with induction of 0.3 T) faceted elongated crystals of micron size are generated. The crystallites of such structure are formed due to the mass transfer of the combustion products in the direction of thermal flows. Ordered six-sided crystal structures are formed by overcooling the oxidation products by the action of magnetic field and by increasing the mobility of their structural units in recrystallization thermal wave. According to electron- microscope investigation the formation of the faceted crystals is possible with optimal sizes of combustion product particles.