Abstract

PERERA-MERCADO, Y. A. et al. Morfología, estructura y propiedades magnéticas de esferas producidas por plasma de Ar-He. Superf. vacío [online]. 2012, vol.25, n.2, pp.70-74. ISSN 1665-3521.

Magnetic spheres were produced by adaptating conventional Ar-He thermal spray processes. This process is based on the projection of different iron oxides-rich powder precursors which are common byproducts of diverse metallurgical industrial activities. Projected particles are trapped inside a special capturing device. Prior to the plasma processing, precursor materials were milled in order to homogenize their initial particle sizes. The produced magnetic particles showed a spherical morphology with different superficial structures. Their composition includes a mixture of crystalline phases that could be indexed to the magnetite (Fe₃O₄), maghemite (gamma-Fe₃O₄) and other phases depending on chemical composition of used precursor. Complete characterization of magnetic spheres was achieved by using several analysis techniques such as: X-ray diffraction (XRD), scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM), X-ray energy dispersive spectroscopy (EDS) and vibrational sample magnetometry (VSM).

Keywords : Plasma Ar-He; B.O.F. slags; magnetic spheres.

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