Abstract Thermite powders with molar composition 8Al·3CuO were prepared in two stages by Arrested Reactive Milling (ARM). In the first stage, the starting materials Al and CuO were milled separately in acetonitrile. Composite powders were then prepared in the second milling stage with hexane as process control agent and in the four possible combinations of one, both, or neither starting material being premilled in acetonitrile. Composites were characterized for morphology, size distribution, surface area, and reactive properties at low heating rates (thermal analysis) and high heating rates (ignition). Whether or not CuO was premilled, dense composites formed without premilling of Al. If Al was premilled in acetonitrile, however, loose agglomerates of refined Al and CuO particles formed in the second milling stage. Premilling changed the low-temperature reactions leading to ignition in the 8Al·3CuO thermites. These changes are attributed to increased porosity of the formed composites if aluminum is premilled with acetonitrile. It is shown that greater refinement and lower ignition temperatures are achievable using two-stage milling.

中文翻译：

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Al和CuO在乙腈中预研磨对阻滞反应研磨制备Al·CuO铝热剂性能的影响

摘要 采用停止反应研磨(ARM) 方法分两步制备了摩尔组成为8Al·3CuO 的铝热剂粉末。在第一阶段，起始原料 Al 和 CuO 在乙腈中分别研磨。然后在第二研磨阶段制备复合粉末，使用己烷作为过程控制剂，并以一种、两种或两种原料在乙腈中预研磨的四种可能组合进行制备。在低加热速率（热分析）和高加热速率（点火）下，对复合材料的形态、尺寸分布、表面积和反应性能进行表征。无论 CuO 是否经过预磨，都可以在不预磨 Al 的情况下形成致密的复合材料。然而，如果 Al 在乙腈中预研磨，则在第二个研磨阶段会形成精制的 Al 和 CuO 颗粒的松散团聚体。预磨改变了8Al·3CuO铝热剂中导致着火的低温反应。如果铝与乙腈一起预研磨，则这些变化归因于所形成复合材料的孔隙率增加。结果表明，使用两阶段研磨可以实现更大的细化和更低的点火温度。