Continuous preparation of multi-scale HMX-based energetic composite microspheres by pipe-stream technology

Abstract

Continuous preparation of energetic microspheres has become a goal pursued by researchers in recent years. This paper combines the pipe control method with suspension self-assembly technology to design and build a pipe-stream control device, which was applied to prepare multi-scale HMX-based microspheres with high sphericity and narrow particle size distribution. The average particle sizes of microspheres have a significant correlation with the process parameters. The flowability, bulk density of HMX-based microspheres and mechanical properties of charges have been significantly improved (energetic microspheres vs water-suspension molding powder, ≯24.6° vs 27.0°; 0.568 g·cm−3 vs 0.489 g·cm−3; 31.6 MPa vs 13.41 MPa). The impact and friction sensitivity of HMX@F2602 microspheres with different particle sizes decreased by 111% ∼ 178% and 80%. Real-time and accurate regulation of particle size can be achieved by changing the process parameters, which has a broad application prospect.