Performance of high-quality energetic crystals achieved by recrystallization and thermally metastable assembly
Nano-explosives exhibit a lot of outstanding performance such as the high energy releasing velocity,low mechanical sensitivity and high sensitivity to short-pulse stimulation, which attained extensive applications as the initiating explosives in modern weapon systems.However, nano-explosives are easily to reunite and lose some performance with the stimulation of exoteric environment such as the heat, electron beams, solvents etc.For a long time, such disordered thermal agglomeration phenomenon was an urgent problem need to be overcome, and few works were reported from another view for the ordered particle assembly based on the environment induction.In this paper, investigation on solvent induced ordered assembly of energetic nano particles was carried out and high-quality explosive crystals (HQEC) can be formed during such assembly process.The appearance and crystal quality of the products after assembly were tested by scanning electron microscopy (SEM) and optical polarized microscopy (OPM), the crystal structure was determined by X-ray diffraction analysis (XRD), thermal properties were analyzed by thermogravimetry (TG) and differential scanning calorimeter (DSC), and the impact sensitivity of each sample was evaluated and expressed by the drop height of 50% explosion probability.After the solvo-thermal treatment of nano-explosives prepared by simple grinding, large crystals were grown in a regular shape, with uniform size and smooth surface.The sensitivity tests showed that the high-quality crystals obtained after assembly exhibited an apparent decrease in impact and shock wave sensitivity compared with the coarse materials and samples by careful solvent/nonsolvent recrystallization.The possible mechanism was proposed for such self-assembly, which typically includes a three-step process as slight surface dissolution-particle agglomeration-crystal growth (SSD-PA-CG).The agglomeration and assembly of nanoparticles studied in this work will probably provide a novel, facile, low-cost and large-scale preparation route for high-quality explosive crystals compared with the conventional solvent/nonsolvent recrystallization.
Energetic Materials Assembly High-quality crystals Thermally metastable Sensitivity
Zhi-jian YANG
Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China
国际会议
2018 International Conference on Defence Technology (2018国际防务技术会议)
北京
英文
226-228
2018-10-21（万方平台首次上网日期，不代表论文的发表时间）