還元窒化法によるAlN粉末の合成

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タイトル別名
  • Synthesis of AlN Powder by Carbothermal Reduction-Nitridation Method
  • カンゲン チッカホウ ニ ヨル AlN フンマツ ノ ゴウセイ チッカ ハンノ
  • Effect of Additives on Reaction Rate
  • 窒化反応に及ぼす各種添加物の影響

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The effect of additives on carbothermal reduction-nitridation was investigated for the preparation of AlN powders from the Al2O3-C-N2 system. According to the role of additives in nitridation, they were divided into three categories: “promote”, “have no effect” and “disturb”. In particular, CaF2 was an excellent nitridation promoter providing spherical AlN particles. The apparent activation energy of nitridation for CaF2 addition was 190kJ/mol, while those for Y2O3, Yb2O3 and without additive were around 250kJ/mol. CaF2, Y2O3, Yb2O3 and transition metal compounds strongly affected AlN grain morphologies, supplying spherical and rod-like shapes of AlN. It was estimated that the reduction-nitridation proceeds through the formation of intermediates like CaF2⋅5Al2O3 and Y-aluminates.

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