铝/有机氟化物复合物对含铝HTPB推进剂燃烧性能的影响

为研究有机氟化物(OF)对含铝HTPB固体推进剂燃烧性能的影响,采用球磨法制备了纳米和微米铝/有机氟化物复合物(nmAl/OF和μmAl/OF),将其作为复合添加剂替代微米铝粉加入HTPB推进剂中,并考察其对推进剂燃烧性能的影响。采用SEM、TEM、粒度分析等对nmAl/OF和μmAl/OF复合物及推进剂凝聚相燃烧产物进行了表征。结果表明,nmAl/OF和μmAl/OF复合物有不同的结合状态;添加OF、nmAl/OF和μmAl/OF后,推进剂的爆热值下降约2%;添加nmAl/OF的推进剂配方燃速最低,在3MPa时仅为6.28mm/s,添加OF和μmAl/OF体系的推进剂燃速压强指数相比于原配方降低约20%;添加nmAl/OF的推进剂配方凝聚相燃烧产物粒度(D_(50))比原配方降低约47%。

Effect of Aluminum/Organic Fluoride Composite on the Combustion Properties of Aluminized HTPB Propellants

To investigate the effect of organic fluoride on the combustion properties of aluminized HTPB solid propellant, nano and micro aluminum/organic fluoride (OF) composites(nmAl/OF and μmAl/OF)were fabricated by ball milling method.The nmAl/OF and μmAl/OF as composite additives,were added to HTPB propellant instead of aluminum powder.The effect of composite additives on the combustion performance of propellant was investigated.The nmAl/OF and μmAl/OF composites and condensed phase combustion products of propellant were analyzed by scanning electron microscope(SEM), transmission electron microscope(TEM) and particle size analysis.The results show that the nmAl/OF and μmAl/OF composite have different combination states.The heat of detonation of propellants reduces by about 2% after adding OF, nmAl/OF and μmAl/OF.The formula contained nmAl/OF has the lowest burning rate of 6.28 mm/s under the pressure of 3 MPa, and compared with the original formulation, the burning rate pressure exponent of two propellants that contained OF and μmAl/OF decreases by about 20%.The particle size(D50) of condensed phase combustion product of the formulation with nmAl/OF reduces by about 47% compared with the original formulation.