Zhen Fei, Zhou Xuyuan, Zou Meishuai, Meng Lingchao, Yang Rongjie, Wang Liqiong, Huang Fenglei, Li Jianmin
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology Zhongguancun South Street No. 5 Beijing 100081 P. R. China
School of Materials Science and Engineering, Beijing Institute of Technology Zhongguancun South Street No. 5 Beijing 100081 P. R. China.
RSC Adv. 2019 Jun 17;9(33):19031-19038. doi: 10.1039/c9ra02393c. eCollection 2019 Jun 14.
In this study, ferric perfluorooctanoate [Fe(PFO)] was used in the aluminized HTPB propellant to reduce Al agglomeration during solid propellant combustion, and the agglomeration reduction mechanism was experimentally demonstrated the burning rate measurement, heat of explosion and Al agglomeration analysis. The behavior of the burning particles on the burning surface as well as the morphology and composition of the quenched burning particles were characterized by microscopic high-speed photography and X-ray photoelectron spectroscopy, respectively; the thermal decomposition properties and gaseous decomposition products of Fe(PFO) were investigated by thermal gravimetry-differential scanning calorimetry joint analysis (TG-DSC), Fourier transform infrared spectroscopy (FTIR) and mass spectrometry (MS). The results show that Fe(PFO) can significantly increase the burning rate of the aluminized HTPB propellant and reduce Al agglomeration. The aluminized HTPB propellant containing Fe(PFO) exhibited a more efficient aluminum combustion process and smaller solid combustion product generation; the agglomeration reduction mechanism was revealed by the comprehensive effects of Fe(PFO) on the thermal decomposition of AP and promotion of the thermite reaction with aluminum. It led to the special "immediate detachment upon ignition" phenomenon of Al particles in the propellant and caused the generation of smaller detached burning Al particles. The highly reactive gaseous decomposition products of Fe(PFO) could reduce the accumulation of the generated AlO on the burning Al particles.
在本研究中，全氟辛酸铁[Fe(PFO)]被用于含铝端羟基聚丁二烯推进剂中，以减少固体推进剂燃烧过程中的铝团聚现象，并通过燃烧速率测量、爆炸热和铝团聚分析对团聚减少机制进行了实验验证。分别通过微观高速摄影和X射线光电子能谱对燃烧表面上燃烧颗粒的行为以及淬熄燃烧颗粒的形态和成分进行了表征；通过热重-差示扫描量热联用分析（TG-DSC）、傅里叶变换红外光谱（FTIR）和质谱（MS）研究了Fe(PFO)的热分解特性和气态分解产物。结果表明，Fe(PFO)可显著提高含铝端羟基聚丁二烯推进剂的燃烧速率并减少铝团聚。含Fe(PFO)的含铝端羟基聚丁二烯推进剂表现出更高效的铝燃烧过程和更少的固体燃烧产物生成；通过Fe(PFO)对高氯酸铵热分解的综合作用以及对与铝的铝热反应的促进作用揭示了团聚减少机制。这导致推进剂中铝颗粒出现特殊的“点火即脱离”现象，并产生更小的脱离燃烧铝颗粒。Fe(PFO)的高活性气态分解产物可减少燃烧铝颗粒上生成的AlO的积累。
