Effect of Mechanical Activation on the Densification Behavior of MgAl2O4 Spinel
Fahrenholtz, William G.
Pavlović, Vladimir B.
Conference object (Published version)
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Magnesium aluminate and other alumina-based spinels attract attention due to their high hardness, high mechanical strength, and low dielectric constant. MgAl2O4 was produced by solid-state reaction between MgO and a-Al2O3 powders. Mechanical activation was used to increase the reactivity of powders and decrease the sintering temperatures. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 30, 60, 90, and 120 minutes. The resulting powders were characterized to determine the effect of activation on surface area, particle size, and crystallinity. Mechanical activation decreased particle size, increased surface area, and increased the width of peaks in x-ray diffraction. Dilatometry was used to monitor densification behavior up to 1500 °C. For non-activated powders, sintering started at approximately 1400 °C, while for activated powders, the onset temperature decreased to about 1340 °C. Mechanical activation is an efficient method to impro...ve the densification behaviour of MgAl2O4 produced from mixed oxide powders.
Keywords:magnesium aluminate / spinels / MgAl2O4 / mechanical activation
Source:The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13), October 27 - November 1, 2019, Okinawa Convention Center, Japan, 2019, 30-B1C-S13-14-
- The Ceramic Society of Japan