Open AccessCharacterization of MgAl2O4 sintered ceramics
Author(s) -
Nina Obradović,
William G. Fahrenholtz,
Suzana Filipović,
Cole Corlett,
Pavle Đorđević,
Jelena Rogan,
Predrag Vulić,
Vladimir Buljak,
Vladimir Pavlović
Publication year - 2019
Publication title -
science of sintering/science of sintering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.309
H-Index - 25
eISSN - 1820-7413
pISSN - 0350-820X
DOI - 10.2298/sos1904363o
Subject(s) - dilatometer , sintering , materials science , ball mill , microstructure , ceramic , phase (matter) , hot pressing , metallurgy , molar ratio , composite material , thermal expansion , biochemistry , chemistry , organic chemistry , catalysis
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 ?ll specimens exhibited full density, while sample activated for 30 minutes showed the fastest densification rate.