Chen Yongjin, Ba Shuhong, Ren Hui
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China.
School of Equipment Engineering, Shenyang Ligong University, Shenyang 110159, China.
Micromachines (Basel). 2021 Dec 4;12(12):1509. doi: 10.3390/mi12121509.
In order to solve the problems of the complicated forming process, poor adaptability, low safety, and high cost of special-shaped energetic grains, light-curing 3D printing technology was applied to the forming field of energetic grains, and the feasibility of 3D printing (additive manufacturing) complex special-shaped energetic grains was explored. A photocurable resin was developed. A demonstration formula of a 3D printing energetic slurry composed of 41 wt% ultra-fine ammonium perchlorate (AP), 11 wt% modified aluminum (Al), and 48 wt% photocurable resin was fabricated. The special-shaped energetic grains were successfully 3D printed based on light-curing 3D printing technology. The optimal printing parameters were obtained. The microstructure, density, thermal decomposition, combustion performance, and mechanical properties of the printed grain were characterized. The microstructure of the grain shows that the surface of the grain is smooth, the internal structure is dense, and there are no defects. The average density is 1.606 g·cm, and the grain has good uniformity and stability. The thermal decomposition of the grain shows that it can be divided into three stages: endothermic, exothermic, and secondary exothermic, and the Al of the grain has a significant catalytic effect on the thermal decomposition of AP. The combustion performance of the grain shows that a uniform flame with a one-way jet is produced, and the average burning rate is 5.11 mm·s. The peak pressure of the sample is 45.917 KPa, and the pressurization rate is 94.874 KPa·s. The analysis of the mechanical properties shows that the compressive strength is 9.83 MPa and the tensile strength is 8.78 MPa.
为了解决异形含能颗粒成型工艺复杂、适应性差、安全性低和成本高的问题，将光固化3D打印技术应用于含能颗粒成型领域，探索3D打印（增材制造）复杂异形含能颗粒的可行性。研制了一种光固化树脂。制备了一种由41 wt%超细高氯酸铵（AP）、11 wt%改性铝（Al）和48 wt%光固化树脂组成的3D打印含能浆料的示范配方。基于光固化3D打印技术成功3D打印出异形含能颗粒。获得了最佳打印参数。对打印颗粒的微观结构、密度、热分解、燃烧性能和力学性能进行了表征。颗粒的微观结构表明，颗粒表面光滑，内部结构致密，无缺陷。平均密度为1.606 g·cm，颗粒具有良好的均匀性和稳定性。颗粒的热分解表明其可分为吸热、放热和二次放热三个阶段，颗粒中的Al对AP的热分解有显著催化作用。颗粒的燃烧性能表明产生了单向喷射的均匀火焰，平均燃烧速率为5.11 mm·s。样品的峰值压力为45.917 KPa，增压速率为94.874 KPa·s。力学性能分析表明，抗压强度为9.83 MPa，抗拉强度为8.78 MPa。
