Preparation and performance characterization of HMX/F2602/GQDs microspheres by spray drying method

GQDs possess numerous active sites, nano-microstructures, and photo-induced conductivity characteristics. In this study, spray drying technology was employed to explore the application of graphene quantum dots (GQDs) in energetic materials. The mechanism of HMX-based composite microsphere formation 0and the synergistic regulation of spray drying process conditions were analyzed. The influence mechanism of GQDs on the microstructure and properties of HMX-based composite microspheres was clarified. The raw materials HMX and HMX/F2602/GQDs were characterized and analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), BAM impact sensitivity tester, and electrostatic spark sensitivity tester. The results show that the prepared HMX/F2602/GQDs microspheres have uniform particle size, smooth and round morphology, and the crystal form of the composite microspheres has not changed. The activation energies of HMX/F2602 and HMX/F2602/GQDs are 504.19 kJ/mol and 657.74 kJ/mol, respectively, which are 5% and 35.4% higher than that of the raw material HMX, respectively. The impact energy increases by 4 J and 6 J, and the electrostatic sensitivity decreases by 2% and 46%, respectively. This indicates that GQDs can significantly improve the thermal stability and safety of energetic materials. It provides a new idea for the design of energetic materials.