Miyake Shugo, Izumi Taisei, Yamamoto Rino
Department of Mechanical Engineering, Kobe City College of Technology, Kobe 651-2194, Japan.
Materials (Basel). 2020 Oct 1;13(19):4394. doi: 10.3390/ma13194394.
In this study, the exothermic temperature performance of various Al/Ni multilayer powders with particle sizes ranging from under 75 to over 850 µm, which generate enormous heat during self-propagating exothermic reactions, was determined using a high-speed sampling pyrometer. The Al/Ni multilayer powders were prepared by a cold-rolling and pulverizing method. The multilayer constitution of the Al/Ni multilayer powders was examined by observing the cross-section of the powders using scanning electron microscopy; the results indicate that the powders had similar lamellar structures regardless of the particle size. Exothermic reactions were carried out to measure the temperature changes during the experiment using a pyrometer. We found that the maximum temperature and the duration of the exothermic reaction increased with an increase in the particle size caused by the heat dissipation of the surface area of the Al/Ni multilayer powder. This indicates that the thermal characteristics of the exothermic reaction of the Al/Ni multilayer powder can be controlled by adjusting the particle size of the Al/Ni multilayer powder. Finally, we concluded that this controllability of the exothermic phenomenon can be applied as a local heating source in a wide range of fields.
在本研究中，使用高速采样高温计测定了各种粒径范围从75微米以下至850微米以上的铝/镍多层粉末的放热温度性能，这些粉末在自蔓延放热反应过程中会产生大量热量。铝/镍多层粉末采用冷轧和粉碎法制备。通过使用扫描电子显微镜观察粉末的横截面来检查铝/镍多层粉末的多层结构；结果表明，无论粒径大小，粉末都具有相似的层状结构。进行放热反应，使用高温计测量实验过程中的温度变化。我们发现，由于铝/镍多层粉末表面积的散热导致粒径增大，放热反应的最高温度和持续时间随之增加。这表明，通过调整铝/镍多层粉末的粒径，可以控制铝/镍多层粉末放热反应的热特性。最后，我们得出结论，这种放热现象的可控性可作为局部热源应用于广泛的领域。
