Abstract
AbstractTwo types of stoichiometric MgAl2O4 spinel powders were prepared by combustion synthesis routes, using sucrose (SCS) or urea (UCS) as fuel. For comparative purposes a stoichiometric MgAl2O4 powder was also prepared by solid state reaction synthesis (SS powder). Pressed compacts of the three powder types were sintered at various temperatures ranging from 1575 to 1625°C for 2 h. After grinding, SCS and SS powders had very narrow particle size distributions, with average particle sizes of 3·17 and 4·13 μm respectively, whereas UCS powder showed a wide particle size distribution with an average particle size of 37·76 μm. Their corresponding surface areas were found to be 65·8, 8·67, and 8·06 m2 g-1. The SCS MgAl2O4 powder sintered at 1625°C for 2 h had a bulk density of 3·44 g cm-3 (96% of theoretical), an apparent porosity of 1·76%, and water absorption of 0·519%. The superior properties of SCS powders compared with other spinel powders are attributed to the higher surface area induced by the larger ...
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