Volume 6, Number 1 (winter 2009 2009)                   IJMSE 2009, 6(1): 26-30 | Back to browse issues page

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M. Ebrahimi-Basabi,, J. Javadpour,, H. Rezaie, M. Goodarzi. Mechanochemical synthesis of alumina nanoparticles. IJMSE. 2009; 6 (1) :26-30
URL: http://ijmse.iust.ac.ir/article-1-156-en.html

Abstract:   (10028 Views)
Abstract: Nano- size alumina particles have been synthesized by mechanical activation of a dry powder mixture of AlCl3 and CaO. Mechanical milling of the above raw materials with the conditions adopted in this study resulted in the formation of a mixture consisting of crystalline CaO and amorphous aluminum chlorides phases. There was no sign of chemical reaction occurring during milling stage as evidenced by x-ray diffraction studies. Subsequent heat treatment of the milled powder at 350ºC resulted in the occurrence of displacement reaction and the formation of Al2O3 particles within a water soluble CaCl2 matrix. The effect of higher temperature calcinations on the phase development in this powder mixture was followed by X-ray diffraction (XRD) analysis and scanning electron microscope ( SEM). Differential thermal analysis (DTA) was used to compare the thermal behavior between the milled and unmilled powders. Perhaps the most important result in this study was the observation of á-Al2O3 phase at a very low temperature of 500ºC.
Type of Study: Research paper |

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