Breakthroughs in additive manufacturing (AM), particularly direct ink write 3D printing, have allowed for greater control of material performance by manipulation of architecture and/or spatial composition. Herein, the range of control over the dynamic energy release rate in 3D‐printed Al/CuO thermite is quantified by substituting random porous pathways present in powder beds or compacts with printed void channels to modulate the energy transport during a reaction. The thermite is produced via on‐the‐fly static mixing of constituent Al and CuO inks, which offers a safe way to handle these materials. By reducing the fundamental burn unit size (i.e., filament size) and introducing small amounts of engineered porosity for gas flow, it is shown that energy release rates can be increased by more than 100 times that of maximum print density strips. Unique channel structures, which display propagation velocities of over 100 m s⁻¹ due to confinement of gas flow, are reported. Ashby plots that show the reactivity design space for 3D‐printed thermites are presented as a function of the effective print/energy density. Architecting with AM tailors an object to release its energy in a prescribed way, and this control adds much‐needed versatility by allowing a single formulation to satisfy multiple applications.

中文翻译：

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Designer Direct Ink Write 3D打印的铝粉，能量释放速率可调

增材制造（AM）的突破，尤其是直接墨水写入3D打印，已通过操纵体系结构和/或空间组成实现了对材料性能的更大控制。在本文中，通过取代粉末床或压实粉体中存在的随机多孔通道（具有印刷的空隙通道）来调节3D打印Al / CuO铝热剂中动态能量释放速率的控制范围，以调节反应过程中的能量传输。该铝热剂是通过动态混合成分Al和CuO墨水而产生的，这为处理这些材料提供了一种安全的方法。通过减小基本燃烧单元的尺寸（即灯丝尺寸）并为气流引入少量的工程孔隙率，结果表明，能量释放速率可以提高到最大打印密度条的100倍以上。据报道，由于气流的限制，^-1。Ashby图显示了3D打印的铝热剂的反应性设计空间，是有效打印/能量密度的函数。使用AM进行架构设计可以按规定的方式释放对象的能量，并且该控件通过允许一个单一的公式满足多种应用，从而增加了急需的多功能性。