メカノフュージョンによるAl<SUB>2</SUB>O<SUB>3</SUB>-Cu複合粉の生成過程と雰囲気酸素の影響

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Using the vacuum mechanofusion apparatus which has been reported. we tried to coat Cu core particles with Al<SUB>2</SUB>O<SUB>3</SUB> covering particles. Mechanofusion in air gave a lower yield of composite particles, while mechanofusion in vacuum or Ar-replaced atmosphere gave a higher yield. That is to say, the yield of the composite particles was enhanced by decreasing the partial pressure of O<SUB>2</SUB> in the residual pressure. The MS analysis revealed that gases such as CO. CO<SUB>2</SUB>, CH<SUB>4</SUB>. etc generated during the mechanofusion at low residual pressures. Under SEM. many micro dents were observed on the naked surface of the composite particles after detaching Al<SUB>2</SUB>O<SUB>3</SUB> particles by irradiation of supersonic wave. The AES detected Cu on the full surface of the uncomposite Al<SUB>2</SUB>O<SUB>3</SUB> particles. When the mechanofusion processing time is short, the reacted Al<SUB>2</SUB>O<SUB>3</SUB> particles on a Cu core particle can be distinguished separately. The longer the mechanofusion processing time, the smoother the surface of the composite particles. When the mechanofusion processing time is long enough, no boundaries between the reacted Al<SUB>2</SUB>O<SUB>3</SUB> particles on a Cu core particle can be distinguished. A physical scheme of the formation of composite particle is proposed.
社団法人粉体粉末冶金協会の論文

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