Preparation of alloyable self-assembled microspheres via micro-droplet technology to enhance combustion performance

The alloying reaction between highly reactive metals and boron (B) can effectively break the oxide layer on the surface of B powder and enhance the energy release efficiency of B. This study designs spherical B/ Titanium (Ti)/ Copper Oxide (CuO) delay materials based on the alloying reaction between B and Ti, using micro-droplet technology for fabrication. The effect of different amounts of Ti powder (ranging from 0 % to 20 %) on microsphere properties was systematically studied by adjusting the mass ratio of Ti powder. The results demonstrate that the microspheres produced using this technique exhibit a narrow particle size distribution, high circularity, excellent dispersibility, and good safety. The ignition tests showed that the microspheres and compressed charge columns can undergo self-sustained combustion, with the flame temperature and burning rate increasing as the Ti powder content rises. This work provides valuable insights into the formulation design and preparation process of boron-based delay composition.