Thermite materials, which are a pyrotechnic composition of metal and metal oxide, can create bursts of heat and high temperature thanks to an exothermic reduction–oxidation reaction. Fabrication methods of bulk thermite materials should preserve the reactivity of the materials and ensure a sufficient mixing of components. This work investigated the use of kinetic spraying and ball milling to overcome the limitations of existing preparation methods. Aluminum–molybdenum trioxide (Al-MoO3) was selected as thermite material. Ball milling and the fractions of metal and oxide were chosen as the variables of the study. The mechanical properties and reactivity of various powders and coatings were evaluated. The milled powders and coatings were successfully fabricated without reactivity loss by properly controlling the process parameters. The bond strength of the Al-MoO3 coating was however weaker than that of a pure Al coating because the MoO3 powder interrupted the intimate bonding between the Al splats. A reactivity analysis demonstrated that ball milling improved the reactivity of both the powders and the coatings by increasing the exothermic value, decreasing the reaction onset temperature, and decreasing the activation energy required for the thermite reaction. The mechanical properties and reactivity of coatings did not vary significantly with the MoO3 fraction.

中文翻译：

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球磨动态喷涂Al-MoO3铝热剂涂层的反应性增强与制备

铝热剂材料是一种金属和金属氧化物的烟火组合物，由于放热的还原-氧化反应，可以产生热量和高温。散装铝热剂材料的制造方法应保持材料的反应性并确保成分的充分混合。这项工作研究了使用动力喷雾和球磨来克服现有制备方法的局限性。选择铝-钼三氧化二铝（Al-MoO3）作为铝热剂材料。球磨和金属和氧化物的分数被选为研究的变量。评估了各种粉末和涂料的机械性能和反应性。通过适当控制工艺参数，成功地制造了研磨的粉末和涂层而没有反应性损失。然而，Al-MoO3 涂层的结合强度比纯 Al 涂层弱，因为 MoO3 粉末中断了 Al 片之间的紧密结合。反应性分析表明，球磨通过增加放热值、降低反应开始温度和降低铝热反应所需的活化能来提高粉末和涂层的反应性。涂层的机械性能和反应性不随 MoO3 含量而显着变化。降低反应开始温度，并降低铝热反应所需的活化能。涂层的机械性能和反应性不随 MoO3 含量而显着变化。降低反应开始温度，并降低铝热反应所需的活化能。涂层的机械性能和反应性不随 MoO3 含量而显着变化。