Nanostructured Cu–Al2O3 composite produced by thermochemical process for electrode application
Nanostructured Cu–Al2O3 composite produced by thermochemical process for electrode application
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DOI：
10.1016/s0167-577x(03)00505-6
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发表时间：
2004
影响因子：
3
通讯作者：
D. W. Lee;B. K. Kim
中科院分区：
文献类型：
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作者：
D. W. Lee;B. K. Kim
采用热化学法制备了纳米Cu-Al 2 O 3复合粉末。合成过程是（1）通过喷雾干燥由水溶性铜和铝的硝酸盐制成的溶液来制备前驱体粉末，（2）空气热处理以蒸发前驱体粉末中的挥发性组分并合成纳米结构的CuO+ Al 2 O 3，以及（3）通过氢气还原CuO为纯铜。实验结果表明，不同的热处理温度有利于γ-Al_2O_3的生成，且不同的热处理温度对γ-Al_2O_3的生成有不同的影响。最终制备的Cu-Al 2 O3复合粉末的平均粒径为20 nm，热挤压块体的电导率和硬度与常规内氧化法制备的Cu-Al 2 O3复合粉末相当。
Nanostructured Cu–Al2O3composite 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 nanostructured CuO+Al2O3, and (3) CuO reduction by hydrogen into pure Cu. The suggested procedures stimulated the formation of the γ-Al2O3, and different alumina formation behaviors appeared with various heat-treating temperatures. The mean particle size of the final Cu–Al2O3composite powders produced was 20 nm, and the electrical conductivity and hardness in the hot-extruded bulk were competitive with Cu–Al2O3composite by the conventional internal oxidation process.