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Formation and Densification Behavior of MgAl 2 O 4 Spinel: The Influence of Processing Parameters
Author(s) -
Ganesh Ibram,
Olhero Susana M.,
Rebelo Avito H.,
Ferreira J. M. F.
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2008.02355.x
Subject(s) - spinel , sintering , materials science , stoichiometry , porosity , ceramic , raw material , phase (matter) , particle size , mineralogy , chemical engineering , metallurgy , composite material , chemistry , organic chemistry , engineering
Different types of dense stoichiometric and nonstoichiometric magnesium aluminate (MgAl 2 O 4 ) 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.