열화학적 방법에 의한 전극용 나노 Cu/Al2O3 복합분말 합성
Synthesis of Cu-Al2O3 Nanostructured Composite Powders for Electrode Application by Thermochemical Process
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Abstract
Nanostructured Cu-Al2O3 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 + Al2O3, and 3) CuO reduction by hydrogen into pure Cu. The suggested procedures stimulated the formation of the gamma-Al2O3, and different alumina formation behaviors appeared with various heat treating temperatures. The mean particle size of the final Cu/Al2O3 composite powders produced was 20 nm, and the electrical conductivity and hardness in the hot-extruded bulk were competitive with Cu/Al2O3 composite by the conventional internal oxidation process.