還元窒化法によるAINの合成に及ぼすCaCO_3-Y_2O_3添加の影響

概要

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The effect of addition of binary system CaO-Y_2O_3 on the synthesis of AIN powder by carbothermal reductionnitridation of Al_2O_3 Was investigated. The nitridation was eonducted at 1450℃ in N_2 gas flow. The morphology of synthesized powders was different from the original Al_2O_3 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 Al_2O_3. The amount of additives remained in final product is smaller than that of starting powder. This synthesized powder is eonsidered to be advantageous to the densification because remaining compounds can act as a sintering aid.
2001-12-01