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Research Letters in Materials Science
Volume 2007 (2007), Article ID 91376, 5 pages
http://dx.doi.org/10.1155/2007/91376
Research Letter

Influence of Phase Composition on Sintered Microstructure of Combustion Synthesized Oxides

1Centre for Advanced Ceramics, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad, Andhra Pradesh 500-005, India
2Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, Aveiro 3810193, Portugal

Received 5 August 2007; Accepted 31 August 2007

Academic Editor: Jainagesh A. Sekhar

Copyright © 2007 Ibram Ganesh and J. M. F. Ferreira. 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.

Abstract

The effects of powders synthesis methods (urea-combustion synthesis (CS) and conventional solid-state (SS) reaction) on the sintering ability, microstructural features, and mechanical properties of Al2O3, MgAl2O4 spinel, and 20 wt.% ZrO2MgAl2O4 upon sintering at 1625C were investigated. X-ray diffraction (XRD), scanning electron microscopy (SEM), relative density (RD), apparent porosity and water absorption capacity, hardness, fracture toughness, and three-point bend test studies revealed the superior sintering ability of CS ZrO2-MgAl2O4 composite powder as compared with one prepared by SS reaction. In contrast, single-phase powders obtained by SS reaction exhibit superior sintering ability over CS synthesized ones. The reasons for differences observed are discussed along this paper.