5 years ago

Phase Retransformation and Void Evolution of Previously Heated HMX-Based Plastic-Bonded Explosive in Wet Air

Phase Retransformation and Void Evolution of Previously Heated HMX-Based Plastic-Bonded Explosive in Wet Air
Jiahui Liu, Qiang Tian, Shiliang Huang, Jian Gong, Yunlong Wang, Guanyun Yan, Guangai Sun, XiaoLin Wang, Liangfei Bai, Zhijian Fan
Octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine-based plastic-bonded explosive (HMX-based PBX) is one of the most important solid energetic materials. The properties of HMX-based PBX are significantly affected by defects, which were reported recently to be generated during the postheating storage. However, the related mechanism is not well understood. In the study, with the in situ X-ray diffraction and small-angle neutron scattering, we explored the phase retransform and void evolution of previously heated HMX particles and HMX-based PBX as a function of time in controlled environments. Compared to a “dry atmosphere”, the relative humidity of 60% accelerated the phase transition of metastable δ-HMX to stable β-HMX and increased the void volume fraction over about a 2 h period.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b04165

DOI: 10.1021/acs.jpcc.7b04165

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