Characterization of MgAl2O^sub 4^ Sintered Ceramics

Single phase MgAl2O4 was made from a one-to-one molar ratio of MgO and Al2O3 powders mixed using ball-milling. Mixtures of MgO and Al2O3 were subsequently treated in planetary ball mill for 30, 60, 90 and 120 minutes in air. The aim of this study was to examine phase composition, microstructure, and...

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Bibliographic Details
Published in:Science of sintering 2019-01, Vol.51 (4), p.363-376
Main Authors: Obradović, Nina, Fahrenholtz, William G, Filipović, Suzana, Corlett, Cole, Dordević, Pavle, Rogan, Jelena, Vulić, Predrag J, Buljak5, Vladimir, Pavlović, Vladimir
Format: Article
Language:English
Subjects:
Aluminum oxide
Ball milling
Ceramics
Densification
Density
Extensometers
Grain growth
Hot pressing
Magnesium oxide
Particle size
Phase composition
Plasma sintering
Powder metallurgy
Radiation
Scanning electron microscopy
Sintering (powder metallurgy)
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Summary:Single phase MgAl2O4 was made from a one-to-one molar ratio of MgO and Al2O3 powders mixed using ball-milling. Mixtures of MgO and Al2O3 were subsequently treated in planetary ball mill for 30, 60, 90 and 120 minutes in air. The aim of this study was to examine phase composition, microstructure, and densification behavior of sintered specimens. After sintering in dilatometer at 1500 °C, the powder was converted to single phase MgAl2O4. The results show that mechanical activation improved the densification behavior of MgAl2O4 sintered specimens, and it reduced the onset temperature for sintering by approx. 100 oC. Based on dilatometer data, powders were subsequently densified at 1450 oC by hot pressing. Almost ?ll specimens exhibited full density, while sample activated for 30 minutes showed the fastest densification rate.
ISSN:0350-820X
1820-7413
DOI:10.2298/SOS1904363O