Abstract The aluminum powder composites based on Al–Al2O3 were obtained by the advanced in–situ partial hydrothermal oxidation method. The opportunity to obtain the controlled amount of alumina on the particle’s surfaces was studied. The water vapor temperature fixed at 90 °C and 120 °C gave the possibility to obtain two composites with the amount of Al2O3 at 9.90 wt % (OAP–1) and 18.75 wt % (OAP–2). Their median diameters were 41–42 μm with normal particle size distribution. The comparison with atomized 7068 alloy (AP–7068) powder showed their better particle sphericity. The OAP–1 sintered sample has the highest hardness of 471 MPa that provided by the highest density of 97.1% and the finest grain structure.

中文翻译：

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通过水热氧化法获得的 Al-Al2O3 粉末复合材料：粉末和烧结样品表征

摘要 采用先进的原位部分水热氧化法制备了Al-Al2O3基铝粉复合材料。研究了在颗粒表面获得受控量的氧化铝的机会。固定在 90 °C 和 120 °C 的水蒸气温度有可能获得两种复合材料，Al2O3 的含量分别为 9.90 wt% (OAP-1) 和 18.75 wt% (OAP-2)。它们的中值直径为 41-42 μm，粒径分布正常。与雾化 7068 合金（AP-7068）粉末的比较表明它们具有更好的颗粒球形度。OAP-1 烧结样品具有 471 MPa 的最高硬度，由 97.1% 的最高密度和最细的晶粒结构提供。