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Mechanical activation of aluminothermic reduction of NiO by high energy ball milling
Date Issued
14-05-2010
Author(s)
Udhayabanu, V.
Singh, Navneet
Murty, B. S.
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.
Volume
497