Abstract
Stoichiometric solution of aluminium nitrate and magnesium nitrate along with 4.66 to 7.66 moles of urea (fuel) concentrations were prepared and heated slowly to evaporate the water till a homogeneous gel was formed. Critical temperatures for the formation of MgAl2O4 spinel were identified using TG/DSC analysis of the gel and the reaction mixture was introduced into the resistive heating furnace preheated at 350oC. Powder mass thus obtained was characterized and was calcined at 1000oC for removal of retained carbon and crystallization. The powder was further characterized for phase purity, powder morphology, particle size and BET surface area. A fuel concentration beyond 6.66 moles generated excess gases resulting from the decomposition of unreacted urea which got occluded in the foamy combustible mixture. On reaching the self-ignition temperature, combustion occured and the sudden escape of these gases led to highly porous, fragile fluffy mass. Surface area and sinterability of the powder showed a clear correlation with the fuel concentration in the reaction mixture. Spark plasma sintered samples in comparison to the conventional sintered samples exhibited enhanced density values with finer grain sizes.
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