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Journal of Nanomaterials
Volume 2008, Article ID 629185, 12 pages
Research Article

Wetting of by Molten Aluminum: The Influence of Additions

Department of Metallurgical and Materials Engineering, The University of Alabama, P.O. Box 870202, Tuscaloosa, AL 35487, USA

Received 24 October 2007; Accepted 2 April 2008

Academic Editor: S. Mathur

Copyright © 2008 Joaquin Aguilar-Santillan. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The effects of additions on the wetting of alumina by molten aluminum were studied by the sessile drop technique. To study the effect of decomposition , the additions were treated at two temperatures (973 K) and (1723 K), respectively. additions at low and high temperatures did not improve the nonwetting character of these compositions. However, at higher firing temperature, the formation of has a nonwetting trend with increasing its content. To address the specifically a pure was produced and tested. It was more nonwetting than the pure alumina. After the analysis of the contact angles for the and the , it was concluded that these additions to alumina do not inhibit wetting by molten aluminum. In fact, at the addition levels common for refractories, the wetting tendency of molten aluminum is enhanced. Alternative explanations for the effectiveness of additions to alumina refractories are discussed.