Characterization of MgAl2O4 sintered ceramics

  • Nina Obradović Institute of Technical Sciences of the Serbian Academy of Sciences and Arts
  • William G. Fahrenholtz Materials Science and Engineering, Missouri University of Science and Technology
  • Suzana Filipović Institute of Technical Sciences of the Serbian Academy of Sciences and Arts
  • Cole Corlett Materials Science and Engineering, Missouri University of Science and Technology
  • Pavle Đorđević Institute of Technical Sciences of the Serbian Academy of Sciences and Arts
  • Jelena Rogan Department of General and Inorganic Chemistry, Faculty of Technology and Metallurgy, University of Belgrade
  • Predrag J. Vulić Faculty of Mining and Geology, University of Belgrade
  • Vladimir Buljak Faculty of Mechanical Engineering, University of Belgrade
  • Vladimir Pavlović Institute of Technical Sciences of the Serbian Academy of Sciences and Arts

Abstract

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 аll specimens exhibited full density, while sample activated for 30 minutes showed the fastest densification rate.

Published
2019-11-27
Issue
Vol 51 No 4 (2019)
Section
Articles

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