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纳米铝热剂可用作基于微机电系统(MEMS)的固体化学微推进器的装药。添加含能粘结剂可以增强纳米铝热剂的推进性能表现。选择硝化棉(NC)和聚偏二氟乙烯(PVDF)作为含能粘结剂,利用静电喷射的方式制备纳米铝热剂,从理论和实验系统地研究了燃料/氧化剂的平衡配比、粘结剂含量对推进性能的影响,并与相同条件下机械混合纳米铝热剂的推进性能比较。结果表明:静电喷射较机械混合纳米铝热剂的固体颗粒分布均匀;Al/CuO的计算最佳平衡配比为0.9,最佳实验平衡配比为1.8;当NC含量为2.5%时,比冲可以达到250.2 m·s~(-1),与无粘结剂的Al/CuO相比增加比例为8.0%;PVDF的加入降低了实验比冲值。粘结剂的分解产物将纳米颗粒分开,增加了凝聚相反应的特征传质长度,导致燃烧持续时间从2.9 ms显著地增加到87.8 ms。
Nanometer thermite can be used as a micro-electromechanical systems (MEMS) based on the chemical micro-thrusters. Addition of energy-containing binders can enhance the propulsion performance of nano-thermite. Nitrocellulose (NC) and polyvinylidene difluoride (PVDF) were selected as energy-containing binders to prepare nano-thermite by electrostatic spraying. The balance of fuel / oxidizer and viscosity were studied theoretically and experimentally The effect of the content of the binder on the propulsion performance was compared with the propulsion performance of the mechanically mixed nanoaluminum pyrolyzer under the same conditions. The results show that the solid particles of electrospray are more uniform than that of mechanically mixed nano-aluminum thermite. The optimal balance ratio of Al / CuO is 0.9 and the best balance ratio is 1.8. When NC content is 2.5% Which can reach 250.2 m · s -1, which is 8.0% higher than that of the unbonded Al / CuO. The addition of PVDF lowers the experimental specific value. The decomposition products of the binder separate the nanoparticles and increase the characteristic mass transfer length of the cohesive phase reaction, resulting in a significant increase in combustion duration from 2.9 ms to 87.8 ms.