The incorporation of aluminum (Al) into explosives represents a facility and efficient way to enhance the energy output through the secondary reaction between Al and the detonation products of explosive. The Al/O ratio and microstructure of HMX/Al play critical roles in combustion performance and energy output. Herein, a gradient structured HMX/Al composite has been designed and fabricated via 3D printing technology using well-dispersed HMX/Al-based ink. For HMX/Al lines, the second reaction heat increases from 196.5 J/g to 1644.8 J/g and the burning rate would decrease from 14.6 to 12.0 mm/s with Al content increased from 10 to 30 wt%. For gradient structured HMX/Al, the burning rate could be controlled by varying the component ratio and the burning rate of each component in the gradient structure was higher than that of the normal HMX/Al counterpart. Furthermore, a gradient evolution of pressure output was monitored for gradient structured HMX/Al cylinder ignited by the laser. These results indicate that the gradient structure as an effective approach can tune combustion performance and energy output of HMX/Al.

将铝（Al）掺入炸药中代表了一种设施和有效的方式，可通过Al与炸药的爆炸产物之间的二次反应来提高能量输出。HMX / Al的Al / O比和微观结构在燃烧性能和能量输出中起着至关重要的作用。本文中，已经使用良好分散的基于HMX / Al的墨水通过3D打印技术设计和制造了梯度结构的HMX / Al复合材料。对于HMX / Al生产线，第二反应热从196.5 J / g增加到1644.8 J / g，燃烧速率将从14.6 mm / s减小到12.0 mm / s，而Al含量从10 wt％增加到30 wt％。对于梯度结构的HMX / Al，通过改变组分比可以控制燃烧速率，且梯度结构中各组分的燃烧速率均高于普通的HMX / Al。此外，针对由激光点火的梯度结构的HMX / Al圆柱体，监控了压力输出的梯度演变。这些结果表明，梯度结构作为一种有效的方法可以调节HMX / Al的燃烧性能和能量输出。