FABRICATION OF IRON-ALUMINA NANOCOMPOSITE POWDER BY HIGH ENERGY BALL MILLING OF HEMATITE-ALUMINUM POWDER MIXTURE

Abstract

In this study, hematite ( Fe 2 O 3) and aluminum ( Al ) powder mixtures were mechanically alloyed in a high-energy shaker ball mill to synthesize the iron-alumina ( Fe - Al 2 O 3) nanocomposite powder. The structural changes and phase developments occurring during mechanochemical process were studied by X-ray diffractometery (XRD) and scanning electron microscopy (SEM). The results showed that mechanochemical reaction of Fe 2 O 3 and Al completed after 3 hours of milling time in a nanocrystalline Fe and Al 2 O 3 embedded form and further milling produced a Fe - Al 2 O 3 nanocomposite powder. Kinetics consideration according to the calculated adiabatic temperature demonstrated the sudden displacement reaction during mechanical alloying that accord well with XRD results. Also, particle size decrease as well as crystallite size with increasing the milling time.