This paper presents thermochemical synthesis of copper/alumina nanocomposites in a Cu-Al₂O₃ system with 1–2.5 wt.% of alumina and their characterization, which included: transmission electron microscopy: focused ion beam (FIB), analytical electron microscopy (AEM) and high resolution transmission electron microscopy (HRTEM). Thermodynamic analysis was used to study the formation mechanism of desirable products during drying, thermal decomposition and reduction processes. Upon synthesis of powders, samples were cold pressed (2 GPa) in tools dimension 8 × 32 × 2 mm and sintered at temperatures within the range 800–1000 °C for 15 to 120 min in a hydrogen atmosphere. Results of characterization showed that dispersion-strengthened compacts could be produced by sintering of thermo-chemically prepared Cu-Al₂O₃ powders with properties suitable for material application, such as a contact material exhibiting high strength and high electrical conductivity at the same time. Additional research was carried out in order to analyze the application of the obtained nanocomposite powders for the synthesis of copper/alumina nanocomposites by a new method, which is a combination of a thermochemical procedure and mechanical alloying. The measured values of an electric conductivity and hardness were compared with ones in literature, confirming an advantage of the proposed combined strategy.

中文翻译：

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制备的铜/氧化铝纳米复合材料的热化学合成与表征研究进展

本文介绍了在Cu-Al ₂ O _3中热化学合成铜/氧化铝纳米复合材料的方法含有1-2.5 wt。％氧化铝的系统及其特征，包括：透射电子显微镜：聚焦离子束（FIB），分析电子显微镜（AEM）和高分辨率透射电子显微镜（HRTEM）。热力学分析用于研究干燥，热分解和还原过程中所需产物的形成机理。合成粉末后，将样品以8×32×2 mm的尺寸进行冷压（2 GPa），并在氢气气氛中于800–1000°C的温度下烧结15至120分钟。表征结果表明，通过热化学制备的Cu-Al ₂ O _3的烧结可以制备分散增强的压块。具有适合材料应用性能的粉末，例如同时具有高强度和高导电性的接触材料。为了分析获得的纳米复合粉末在热化学方法和机械合金化相结合的新方法中的应用，进行了进一步的研究。将电导率和硬度的测量值与文献中的值进行了比较，证实了所提出的组合策略的优势。