Title: Improving hydration resistance of aluminium powders by using Al₂O₃ sol-gel method

Authors: Quan-Li Jia; Xin-Hong Liu; Xiao-Gai Sun; Ran Wu

Addresses: School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450052, China ' School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450052, China ' School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450052, China ' School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450052, China

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.

Keywords: aluminium powders; sol-gel method; hydration resistance; hydration behaviour; Al2O3 gel coatings; Al(OH)3; aluminium oxide; alumina; nitridation.

DOI: 10.1504/IJNM.2014.058999

International Journal of Nanomanufacturing, 2014 Vol.10 No.1/2, pp.75 - 82

Received: 29 Dec 2012
Accepted: 26 Mar 2013
Published online: 17 May 2014 *

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