Abstract
Aluminothermic reduction of niobium pentoxide was triggered during high-energy milling of powder mixtures of Nb2O5 and metallic aluminum using Attritor and Planetary mills. The employed composition had 10% (at.) of aluminum related to the stoichiometry of the reaction. All millings were conducted under argon atmosphere, and the temperature of milling vials was measured during milling process. The used milling times were 4 h and 8 h (Attritor mill) and 8 h (Planetary mill). The as-milled powders were characterized using X-ray diffraction, thermal analysis and scanning electron microscopy techniques. The measured temperature of the vials indicated that a great exothermic reaction took place during the milling progress, and this was attributed to Nb2O5 reduction. The X-ray patterns of as-milled powders indicated peaks that are referred to metallic niobium and aluminum dioxide; traces of Nb2O5 are found in some milling products
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