Al-Cu2元系混合圧粉体の焼結過程について

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  • On the Sintering Process of Al-Cu Binary Mixed Powder Compacts
  • Al-Cu2ゲンケイ コンゴウ アップンタイ ノ ショウケツ カテイ ニ ツイテ

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The sintering process of Al-Cu 4wt% binary mixed powder compacts was investigated by the vertical dilatometer. The compacts expand rapidly with large pore generation at the eutectic temperature of 548°C. The amount and velocity of the expansion depends considerably on the sintering temperature, compacting pressure and particle size. However, the amount of the shrinkage does not depend on the compacting pressure and particle size, but on the sintering temperature or the amount of the liquid phase.<BR>In order to observe the process of the expansion and pore generation plainly, the synthetic sintering experiments using the pressed wire model with 0.16 mmφ Al wires and 0.15 mmφ Cu wires were carried out at 600°C. Cu penetrates rapidly in the horizontal direction against the compacting direction. However, the amount of the expansion in the compacting direction is much larger than in the horizontal direction. On the other hand, the pores are not observed at the initial positions of Cu wires, but at the boundaries between the Al wires in which Cu diffused and those in which Cu didn't diffuse.

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