To explore the preparation process and combustion performance of high active metal energetic microspheres,Al/B/PTFE energetic microspheres were prepared by emulsion self-assembly technology with Viton as binder,polytetrafluoroethylene(PTFE),boron powder(B)and aluminum powder(Al)as high-energy components.The volatilization temperature of solvent,the type of emulsifier,the volume ratio of water phase to oil phase and stirring speed were optimized.The morphology of Al/B/PTFE energetic microspheres was characterized by scanning electron microscopy(SEM).The thermal decomposition proper-ties of Al/B/PTFE energetic microspheres were analyzed by TG-DSC method.The combustion reaction performance of the mi-crospheres was characterized by high-speed photography and closed explosive bomb device.The results show that the optimum preparation process of Al/B/PTFE energetic microspheres is water bath temperature of 25 ℃,emulsifier of PVA,water-oil vol-ume ratio of 80:30 and stirring speed of 700r/min.The prepared Al/B/PTFE energetic microspheres have uniform particle size,high sphericity and controllable particle size,and the main particle size distribution range is about 300～900μm.The dispersion,reaction heat,combustion flame area and pressure output performance of the microspheres increase first and then decrease with an increase in the particle size.The maximum reaction heat,the maximum flame area,and the maximum peak pressure of Al/B/PTFE energetic microspheres are 1 097.97J/g,186.06cm2 and 213.3 kPa,which are 1.77 times,5.16 times and 1.37 times of the physical mixed samples,respectively.
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