HMX晶体内部孔隙率、缺陷类型及颗粒度对冲击波感度的影响

Effects of HMX Crystal Characteristics on Shock Sensitivities:Crystalline Inter Voids,Particle Size,Morphology

采用标准隔板试验方法分别研究了HMX的晶体内部空隙（用晶体表观密度表征）、颗粒度、形貌和缺陷类型对冲击波感度的影响规律。冲击波感度测试采用隔板试验,药柱配方为HMX/食用油（76/24）,药柱采用液体填充方式制备。隔板试验研究表明：随着非孪晶HMX晶体表观密度在1.8992-1.9016 g·cm-3范围内增加,炸药配方的冲击波感度降低,隔板厚度从15.5 mm降到13.2 mm,晶体内部空隙率与隔板厚度基本成线性关系;当晶体表观密度基本相近时,在20-650μm粒度范围内,随着颗粒度的增加,非孪晶HMX炸药配方的冲击波感度增加,隔板厚度从13.0 mm升到14.3 mm;无论是粗颗粒还是细颗粒,含有孪晶缺陷HMX的冲击波感度显著高于非孪晶HMX;当晶体表观密度和颗粒尺寸相近时,晶体颗粒的外观形貌对炸药冲击波感度影响不大。

The effects of HMX crystalline inter voids,particle size,morphology and defects type on shock sensitivity were studied using standard gap test method.The shock initiation threshold of HMX/rap oil（76/24,wt.%） composition was detected with gap test where HMX was recrystallized to various qualities.Results show that the gap thickness decreases from 15.5 mm to 13.2 mm when the crystal apparent density increases from 1.8992 g·cm-3 to 1.9016 g·cm-3,and gap thickness increased from 13.0 mm to 14.3 mm with particle size increasing from 20 μm to 650 μm.The crystal defects type is major factors affecting shock sensitivity,and the shock sensitivities of HMX with twins defects is higher than that of without twin defects.The crystal morphology has almost no effects on shock sensitivity,when the crystal apparent density and particle size is same.