含氟热固性聚氨酯弹性体对含铝炸药燃烧及释能特性的影响OA

In response to the problem of slow and incomplete energy release caused by the dense oxide layer on the surface of aluminum powder in pouring aluminum containing explosives,the HTFB binder system was established,the process,mechani-cal,and thermal stability properties were characterized.Fluorine containing thermoplastic polyurethane elastomer was intro-duced into metallic fuel aluminum,and its influence mechanism on the combustion characteristics of aluminum powder was stud-ied by using combustion test methods.The energy release law of HMX-based aluminum-containing explosives was explored.The results indicate that perfluoropolyether glycol is a plasticizer compatible with HTFB,the fracture elongation of the fluorina-ted binder system is lower than that of the traditional HTPB system,but its thermal stability is excellent.Fluorine-containing binder can significantly improve the combustion performance of aluminum-containing systems,and the combustion performance further improves with the increase of fluorine content,manifested as an increase in heat of combustion value,a significant re-duction in combustion time,an increase in pressurization rate,and the combustion products existing in smaller,independent spherical particle forms.In the formulation of aluminum-containing explosives,the fluorine-containing binder system enhances the ignition and combustion ability of aluminum-containing explosives,also improving their detonation performance,manifested by an increase in the density of the formed grain(from 1.727 g/cm3 in HTPB to 1.922 g/cm3 in F45),an increase in detona-tion velocity(from 6469m/s in HTPB to 6 542m/s in F45),and an increase in detonation heat(from 7016kJ/kg in HTPB to 7 867kJ/kg in F45).