HMX晶体高温相变及裂纹对点火的影响

Influence of High Temperature Phase Transformation and Cracks on Ignition of HMX Crystal

炸药晶体的相结构、相变过程以及相变引起的微结构变化对炸药性能有重要影响。为研究HMX晶体的高温相变及其引起的裂纹对点火的影响,开展了HMX晶体的原位高温拉曼光谱、X射线衍射实验以及落锤实验。通过拉曼光谱和X射线衍射谱识别出不同温度加载和后处理方法对HMX晶体相结构和微结构的影响。制备了3类含有不同相结构和裂纹的HMX样品,实现了相结构和裂纹对点火影响的解耦。落锤实验结果显示,对于3类HMX晶体,按照敏感度由高到低排序依次为含裂纹的β-δ混相、含裂纹的β相、无裂纹的β相。最后,分析了高温相变和裂纹提高HMX晶体感度的原因。

The crystal structure,phase transition and microstructure changes of explosive crystals have important influence on the properties of explosives.In order to study the high temperature phase transition of HMX crystals and the effect of the cracks caused by them on ignition,we performed in situ high temperature Raman spectroscopy and X-ray diffraction on HMX crystals.Moreover,drop weight experiments were also carried out for HMX crystals with different cracks and phase structures.The effects of different temperature loading and post-treatment methods on the phase structure and microstructure of HMX crystals were identified by Raman spectroscopy and X-ray diffraction spectroscopy.Samples with different phase structures and cracks were prepared,and the decoupling of the HMX phase structure and the effect of cracks on ignition was realized.The results of the HMX crystal drop-weight impact experiment showed that the order of sensitivity of the three types of HMX crystals under the drop-weight impact was:crack-containingβ-δphase>βphase with cracks>βphase without cracks.And the reasons why high temperature phase transition and cracks can improve the crystal sensitivity of HMX were also analyzed.