同轴静电喷雾法制备球形NQ/NC复合炸药及其性能研究OA

To address the issues of low density,poor flowability,and insufficient thermal stability of nitroguanidine(NQ)with needle-shaped crystals,the coaxial electrostatic spray technology was employed to prepare the spherical NQ/nitrocellulose(NC)composite energetic explosives.The samples were characterized by using scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FT-IR),thermogravimetry-differential scanning calorimetry(TG-DSC),X-ray photoelectron spectroscopy(XPS),and mechanical sensitivity instrument to analyze their morphology,structure,thermal behavior,surface composition,and sensitivity.The results indicate that spherical NQ/NC composite particles with smooth,dense surfaces and an average size of approximately 200 nm can be produced effectively by the coaxial electrostatic spray method.X-ray Photoelec-tron Spectroscopy(XPS)confirms a coating efficiency of 74.02％for NQ within the spherical NQ/NC composite explosive,forming a compact core-shell structure.Fourier Transform Infrared(FT-IR)spectroscopy indicates that the formation of the composites were formed through physical interactions.Compared to raw NQ and single-needle samples,the apparent activa-tion energy of the spherical NQ/NC composites increased by 10.41 kJ/mol and 1.67 kJ/mol,respectively.At the same time,their thermal explosion critical temperatures rose by 8.2 K and 1.1 K,indicating significant improvements in thermal stability.Both impact and friction sensitivities show no probability of detonation.The bulk density of the NQ/NC coaxial sample is 1.217 g/cm3,an increase of 0.833 g/cm3 compared to the raw NQ,and its flowability was significantly improved.