Abstract
The effect of addition of binary system CaO-Y2O3 on the synthesis of AlN powder by carbothermal reductionnitridation of Al2O3 was investigated. The nitridation was conducted at 1450°C in N2 gas flow. The morphology of synthesized powders was different from the original Al2O3 powder. The XRD analysis showed that the reaction progressed through formation of several aluminates during nitridation. These aluminates were confirmed to promote the nitridation and vary the morphology of raw Al2O3. The amount of additives remained in final product is smaller than that of starting powder. This synthesized powder is considered to be advantageous to the densification because remaining compounds can act as a sintering aid.
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