B/Fef3@Ap Three-Dimensional Energetic Microsphere: Improve the Combustion Performance and Energy Release of B Powders

Abstract

The high ignition temperature and low combustion efficiency of boron (B) powder seriously affect the efficient application of boron-based energetic composites. The paper used FeF3, AP, and B particles to form an energetic microsphere unit to improve micron B powders’ combustion performance and energy release efficiency. The thermal properties, ignition properties, and combustion properties of B/FeF3@AP composites were investigated by thermogravimetry-coupled infrared spectroscopy (TG-IR), scanning electron microscope (SEM), X-ray diffractometer (XRD), high-speed camera system and infrared thermal imager. The results show that the composition of the package structure and the incorporation of FeF3 can effectively reduce the initial oxidation and ignition temperatures of B powders by about 23.55% and 33.2%. Moreover, when FeF3 content is 1%, spherical B/FeF3@AP composites have excellent reaction calorific value (8705.7J/g) and maximum combustion temperature (1218.9℃), with relative increases of 22.6% and 39.8%. The linear combustion rate reached 5.4 cm/s, about 157% higher than the physical mixture B/AP. This study provides valuable insights for applying boron-based energetic composites in the field of energetic materials.

Keywords: Boron, Spherical structure, Thermal decomposition, Ignition performance, Combustion performance.