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Preparation of nano HMX and its application in PBX mixed explosives research

Author: ZengJiangBao
Tutor: JiangZuo
School: Nanjing University of Technology and Engineering
Course: Materials Engineering
Keywords: Ball milling method Nano HMX Thermal properties Sensitivities PBXmolding powder
CLC: TQ560.1
Type: Master's thesis
Year: 2014
Downloads: 7
Quote: 0
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Abstract


Nanometer energetic Materials could significantly reduce their sensitivity and the comprehensive performance also be improved. HMX was currently the most comprehensive performance elemental explosives which had been used, widely used in solid propellants and mixed explosives and other weapons. This study will use the ball milling method for preparing nano HMX, and investigate its thermal decomposition characteristics, sensitivity characteristics, and analyzed the mechanistic of sensitivity reduction. And preliminary studied the PBX molding powder containing nanometer HMX preparation technology, the molding powder thermal decomposition characteristics were also studied. The main contents were as follows.Firstly, nano HMX were prepared by pulverized machine HLG-5. The particle distribution was analyzed by the laser particle size analyzer and the particle size, the morphology of nano HMX were characterized through SEM. Simultaneously the drying process and storage properties of nano HMX were investigated, The contaminants were detected by FT-IR, XRD and ICP. The results showed that when the filler content was60%, the speed was1200rpm and the grinding time was4h, the HMX particles were almost under100nm and the particle size distribution was narrowed. The nano HMX with using a special special freeze-drying to obtain had good dispersion and high purity.Secondly, The thermal decomposition of nano HMX was described by the TG/DSC simultaneous thermal analyzer. Furthermore, the explosion temperature in five seconds and the sensitivities of nano HMX were tested to indicate the stability. It was found that the activation energy, the self-ignition temperature and the explosion temperature in five seconds were lower than those of micro HMX by11.19kJ·mol-1,2.11K and4.9℃respectively. The electrostatic sensitivity and the sensitivity to flame of nano HMX were the same as micro HMX.The friction, impact and shock sensitivities of nano HMX were decreased by28%,20.2%and56.4%, respectively.Lastly, the aqueous suspension was adopted to prepare for the PBX molding powder containing nanometer HMX, and the molding powder thermal decomposition characteristics were studied.The results showed that when the solid-liquid ratio was1:4, the bath temperature was75℃, the binder solution was5%, the speed was500rpm, the molding powder particles s containing nano HMX had the uniform size and the appearance of regular shape.Compared to the nano HMX,molding powder containing raw HMX, the molding powder containing the nano HMX of the apparent activation energy Ea, self-ignition temperature were almost no change.It indicated that the thermal stability was essentially the same.And this study would make a good foundation for the nano HMX using on the PBX explosive.

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