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열화학적 방법에 의한 전극용 나노 Cu/Al2O3 복합분말 합성

Synthesis of Cu/Al2O3 Nanostructured Composite Powders for Electrode Application by Thermochemical Process

  • 이동원 (한국기계연구원 재료연구부) ;
  • 배정현 (한국기계연구원 재료연구부) ;
  • 김병기 (한국기계연구원 재료연구부)
  • 발행 : 2003.10.01

초록

Nanostructured Cu-$Al_2O_3$ composite powders were synthesized by thermochemical process. The synthesis procedures are 1) preparation of precursor powder by spray drying of solution made from water-soluble copper and aluminum nitrates, 2) air heat treatments to evaporate volatile components in the precursor powder and synthesis of nano-structured CuO + $Al_2O_3$, and 3) CuO reduction by hydrogen into pure Cu. The suggested procedures stimulated the formation of the gamma-$Al_2O_3$, and different alumina formation behaviors appeared with various heat treating temperatures. The mean particle size of the final Cu/$Al_2O_3$ composite powders produced was 20 nm, and the electrical conductivity and hardness in the hot-extruded bulk were competitive with Cu/$Al_2O_3$ composite by the conventional internal oxidation process.

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