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°C. Based on dilatometer data, powders were subsequently densified at 1450°C by hot pressing. Almost all specimens exhibited full density, while sample activated for 30 minutes showed the fastest densification rate.
N. Obradovic et al., "Characterization of MgAl₂O₄ Sintered Ceramics," Science of Sintering, vol. 51, no. 4, pp. 363-376, International Institute for the Science of Sintering (IISS), Apr 2019.
The definitive version is available at https://doi.org/10.2298/SOS1904363O
Materials Science and Engineering
Keywords and Phrases
Mechanical activation; SEM; Sintering; Spinel; XRD
International Standard Serial Number (ISSN)
Article - Journal
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01 Apr 2019