Characterization of Cu-Al2O3 nano-scale composites synthesized by in situ reduction
Characterization of Cu-Al2O3 nano-scale composites synthesized by in situ reduction
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DOI：
10.1016/s0928-4931(01)00272-7
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发表时间：
2001-08-20
期刊：
影响因子：
--
通讯作者：
Solórzano, IG
中科院分区：
文献类型：
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作者：
Motta, MS;Jena, PK;Solórzano, IG
据报道，铜-氧化铝系统具有优异的性能组合，这些性能基本上取决于其微观结构，而微观结构又会根据制备方法而变化。在这项工作中，通过原位还原由 CuO 和 Al2O3 组成的粉末混合物（先前通过化学途径获得）来合成 Cu-Al2O3（5 wt.%）纳米级复合材料。该程序赋予产品微观结构方面的特殊特征。 TEM 明场和中心暗场成像显示出发育良好的铜晶体，周围环绕着精细分散的 Al2O3 纳米级颗粒，其尺寸约为 10 nm。尽管尺寸很小，但 50 nm 左右的铜晶体分散并表现出孪晶。目前的研究方向是通过 HRTEM 测定颗粒尺寸分布。 (C) 2001 Elsevier Science B.V. 保留所有权利。
The copper-alumina system is reported to have an excellent combination of properties that are essentially dependent on their microstructure, which in turn, will vary according to the preparation method. In this work, the synthesis of the Cu-Al2O3 (5 wt.%) nano-scale composites were carried out by in situ reduction of a powder mixture consisting of CuO and Al2O3, previously obtained through a chemical route. The procedure imparts special features to the product in terms of microstructure. TEM bright field and centered dark field imaging have shown well-developed copper crystals surrounded by a fine dispersion of Al2O3 nano-scale particles, which are in the order of 10 nm. Copper crystals in the order of 50 nm are dispersed and exhibit twinning despite their small size. Current investigation is being developed towards the determination of particle size distribution through HRTEM. (C) 2001 Elsevier Science B.V. All rights reserved.