Densification ability of combustion-derived Al2O3 powders
authors Ganesh, I; Torres, PMC; Ferreira, JMF
nationality International
journal CERAMICS INTERNATIONAL
author keywords MgO; Combustion synthesis; alpha-Al2O3; Boehmite; Sucrose; Urea; Sintering behaviour; Microstructure
keywords ALPHA-ALUMINA; NANOCRYSTALLINE ALPHA-AL2O3; MGAL2O4; SPINEL
abstract Nanocrystalline Al2O3 powders containing different amounts of MgO (0.1-5.0 mol%) or added boehmite (AlOOH) have been synthesized by combustion synthesis from aluminium nitrate and magnesium nitrate, using urea or sucrose as fuels. The as synthesized alumina powders were deagglomerated, compacted by dry pressing and sintered at 1625 degrees C for 2 h. For comparison purposes, a commercial high purity alpha-Al2O3 powder (ACC) was also processed following the same route. The sintered materials were characterized for bulk density (BD), apparent porosity (AP), and water absorption (WA) capacity, microstructure using SEM, and XRD phase composition. In comparison to boehmite, the MgO had a considerable effect on the densification behaviour of combustion-synthesized powder. (C) 2008 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0272-8842
year published 2009
volume 35
issue 3
beginning page 1173
ending page 1179
digital object identifier (doi) 10.1016/j.ceramint.2008.05.011
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000264016300040
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