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Summary: Magnesium aluminate (MgAl2O4) spinel produced via
self-heat-sustained (SHS) technique
Lim Rooi Pinga,1
, Abdul-Majeed Azadb,
*, Teng Wan Dunga
a
Ceramics Technology Center, SIRIM Berhad, 1 Persiaran Dato' Menteri, Section 2, 40911 Shah Alam,
Selangor, Malaysia
b
NexTech Materials, Ltd., 720-I Lakeview Plaza Blvd., Worthington, OH 43085, USA
(Refereed)
Received 20 November 2000; accepted 25 February 2001
Abstract
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 1600°C led to compacts with density as high as 92% with benign
microstructural features. The beneficial effect of slightly off-stoichiometry ( 9 wt. %) in composi-
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