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Formation and Densification Behavior of MgAl2O4 Spinel: The Influence of Processing Parameters

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Different types of dense stoichiometric and nonstoichiometric magnesium aluminate (MgAl2O4) spinel (MAS) ceramics were prepared following a conventional double-stage firing process using different commercially available alumina and magnesia raw materials. Stoichiometric, magnesia-rich, and alumina-rich spinels were sintered at 1500°–1800°C for 1–2.5 h. The influence of the different processing parameters (average particle size, degree of spinel phase, green density, mass of the powder compact, sintering temperature, holding time at the peak temperature, and starting composition) on the densification behavior of MAS was assessed by measuring the bulk density, apparent porosity, and water absorption capacity, and microstructural observations. Most of the MAS compositions tested exhibited excellent sintering properties.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2008.02355.x

Affiliations: Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, Aveiro, P-3810193, Portugal

Publication date: June 1, 2008

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