液滴微流控技术制备Al/B/MnO2含能微球及性能研究OA

To investigate the effect of B on the performance of nano-thermites,Al/B/MnO2 thermite microspheres with differ-ent Al/B molar ratios were prepared via droplet microfluidic technology.The morphology,flowability,bulk density,specific surface area,thermal properties and combustion properties of the microspheres were characterized,and the influence of differ-ent molar ratios of Al/B on the microsphere properties was studied.The results show that the microspheres prepared by droplet microfluidic technology exhibit narrow particle size distribution,high circularity and excellent dispersibility.Both loose and compacted microspheres can achieve stable combustion,and the flame temperature and burning rate of the microspheres are af-fected by the fuel composition.When the Al/B molar ratio is 75/25,the microspheres present the highest reactivity and the maximum combustion flame temperature of 1 609 ℃.The burning rate decreases from 26.45 mm/s to 11.03 mm/s with in-creasing boron content.It is demonstrated that boron incorporation can regulate the physical structure and energy performance of nanothermites.