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Magnesium aluminate (MgAl2O4) spinel produced via self-heat-sustained (SHS) technique

Summary: Magnesium aluminate (MgAl2O4) spinel produced via
self-heat-sustained (SHS) technique
Lim Rooi Pinga,1
, Abdul-Majeed Azadb,
*, Teng Wan Dunga
Ceramics Technology Center, SIRIM Berhad, 1 Persiaran Dato' Menteri, Section 2, 40911 Shah Alam,
Selangor, Malaysia
NexTech Materials, Ltd., 720-I Lakeview Plaza Blvd., Worthington, OH 43085, USA
Received 20 November 2000; accepted 25 February 2001
Usage of a new but simple and reactive technique employing metallic aluminum as one of the
reactants to produce very high phase-purity magnesium aluminate powder under rather mild experi-
mental conditions is described. Low temperature melting of aluminum and subsequent exothermic
reaction between molten aluminum and magnesia appeared to have led to the powder with a very high
fraction of the spinel phase with small particle size and narrow particle size distribution. This powder
upon sintering for 4h at 1600C led to compacts with density as high as 92% with benign
microstructural features. The beneficial effect of slightly off-stoichiometry ( 9 wt. %) in composi-


Source: Azad, Abdul-Majeed - Department of Chemical and Environmental Engineering, University of Toledo


Collections: Materials Science; Energy Storage, Conversion and Utilization