Improving hydration resistance of aluminium powders by using Al₂O₃ sol-gel method
by Quan-Li Jia; Xin-Hong Liu; Xiao-Gai Sun; Ran Wu
International Journal of Nanomanufacturing (IJNM), Vol. 10, No. 1/2, 2014

Abstract: The hydration and nitridation behaviour of Al powders before and after coated by Al₂O₃ gel were investigated. The results show: 1) the amount of hydrated product Al(OH)₃ for uncoated Al powder increases with hydration time; 2) there is practically no hydrated product Al(OH)₃ for coated Al powders at 80°C for 12 hrs indicating the hydration resistance of Al powder can be avoided by Al₂O₃ sol-gel coated method, which is due to the formed Al₂O₃ gel coatings were continuous and dense on the surface of Al powder retarding Al reacts with water; 3) there is no influencing of Al₂O₃ sol-gel coated on the reaction behaviour of Al powder in N₂ atmosphere, which is due to the decomposition of Al₂O₃ gel coatings providing channels for N₂ reacts with aluminium powder at high temperatures.

Online publication date: Sat, 17-May-2014

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