Int. J. of Nanomanufacturing   »   2014 Vol.10, No.1/2

 

 

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

 

Int. J. of Nanomanufacturing, 2014 Vol.10, No.1/2, pp.75 - 82

 

Submission date: 16 Dec 2012
Date of acceptance: 26 Mar 2013
Available online: 01 Feb 2014

 

 

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