In this work, the carbothermal reduction of AI203 to AIN was studied.boehmite (AIOOH) were examined in order to observe the diffcrences in reaction behaviour and powder characteristics obtained from each type of precursor. Cane sugar (sucrose) and carbon black were used as carbon sources. Reaction conditions studied were carbon to alumina ratio, temperature and reaction time. Sucrosp. resulted in a close-to-stoichiometric ratio of AI 2 0 3 : C (l : 3.2) achicving full conversion to AIN and produced a regular powder morphology, whiist carbon black required higher ratio (> 1 : 4) to reach full conversion with agglomeration of the AIN powder. The optimal reaction temperature was 1600 oC with the reaction time being dependent on the Al 2 0 3 source. The results of the thermodynamic study for the AI-N-O-C system suggest a solid-state reaction process which is consistent with the experimental observations. Moreover, flowing N 2 gas flushes out the product CO gas and thus forces the equilibrium in favour of AIN formation. Reaction mechanisms are proposed for the two forms of carbon precursor.
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