Publication: Mechanical activation of aluminothermic reduction of NiO by high energy ball milling
Date
14-05-2010
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
The effect of mechanical activation on NiO-Al reaction has been investigated by carrying out high energy ball milling using toluene as the process controlling agent. NiO reduction reaction progresses gradually and a maximum of 70% reduction has been observed in 20 h of milling. Amorphous alumina forms as the product of NiO reduction and it transforms to stable α-Al2O3 at 1000 °C via the formation of metastable transition γ-Al2O3. The activation energy of NiO reduction in unmilled powder is 277 kJ/mol whereas in 20 h milled powder the activation energy has been reduced to 150 kJ/mol. © 2010 Elsevier B.V. All rights reserved.
Description
Keywords
Kinetic, Mechanical alloying, Nanostructured materials, Solid state reaction, Transmission electron microscopy, X-ray diffraction