円筒モデルによるMo-Al系，Co-Al系金属間化合物の反応過程の熱力学的解析

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  • Thermodynamic Analysis of Reaction Mechanisms of Mo-Al, Co-Al Intermetallic Compounds by Cylindrical Reaction Model
  • エントウ モデル ニ ヨル Mo-Alケイ,Co-Alケイ キンゾク カン カゴウブツ ノ ハンノウ カテイ ノ ネツ リキガクテキ カイセキ

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In the previous paper, dipping experiments of metal wires (metal=Mo, Co) into molten Al were investigated to analyze the combustion synthesis of Mo-Al and Co-Al intermetallic compounds. From the dipping experiment, it was found that MoAl4 and CoAl3 compound layers were formed between the metal wires (Mo, Co) and the molten Al. The compound formation reactions were analyzed by a cylindrical reaction model that the outer side was the molten Al, central cores were the metal wires(Mo, Co), and intermediate layers were the intermetallic compounds(MoAl4, CoAl3).<BR>The compound formation reactions were able to be simulated by calculating the cylindrical model. The values calculated by the model agreed with the experimental value. The following reaction parameters were obtained from the model calculation for the Mo-Al system.<BR>LogDAl/m2·s−1=−9.813×102/T−10.243<BR>Logkc/mol·m−2·s−1=−9.696×102/T−1.755<BR>It was suggested that the reaction rate was controlled by the diffusion process of Al and the chemical reaction process, from the reaction resistances calculation using the cylindrical model. Additionally, the numerical analysis by the cylindrical model was performed for Co-Al system.

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