PHYSICAL CHARACTERISTICS AND THEIR STUDY | |
Название | Investigation of Effects Induced by Weak Magnetic Fields in Iron Powders |
Автор | E. A. Skryleva, N. Yu. Tabachkova, K. D. Scherbachev, M. I. Voronova |
Информация об авторе | National University of Science and Technology «MISIS»: E. A. Skryleva N. Yu. Tabachkova K. D. Scherbachev M. I. Voronova |
Реферат | The effect of magnetic field treatment on the structure and chemical composition of reduced iron powders has been studied. The methods of transmission electron microscopy, X−ray diffraction and X−ray photoelectron spectroscopy have been used, and corrosion rate has been measured. We show that the processing of powders in an installation having an alternating magnetic field of 0.1 T and a frequency of 21 Hz does not result in any changes to the structure and phase composition. Reduced iron powder particles are spherical; the average diameter is of 2−3 microns, the particles being covered with an amorphous shell. Surface chemical composition studies have shown the shell to be a layer of natural ferric oxide/hydroxide forming in air. A method has been developed for determining the thickness of the oxide shell covering the spherical particles based on the relation of photoelectron lines intensities of the zero−valent and oxidized iron. We show that the shell thickness in magnetic field treated specimens is by 10−20% less than that in untreated powder. Corrosion rate measurements in a corrosive environment have shown that magnetic treatment significantly reduces the oxidation rate of the powders: the more the processing time, the lower the corrosion rate. |
Ключевые слова | Iron powders, magnetic field treatment, structural parameters, chemical composition, oxide coating |
Библиографический список | 1. Al’shic, V. I. Magnitoplasticheskii effekt: osnovnye svoistva i fizicheskie mehanizmy / V. I. Al’shic, E. V. Darinskaya, M. V. Koldaeva, E. A. Petrzhik // Kristallografiya. − 2003. − T. 48, N 5. − P. 838—867. 3. Morgunov R. B. Spinovaya mikromehanika v fizike plastichnosti / R. B. Morgunov // UFN. 2004. T. 174, N 2. P. 131—153. |
Language of full-text | русский |
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