粒度对HMX热感度及火焰感度的影响研究

Effect of the Particle Size on Thermal Sensitivity and Flame Sensitivity of HMX

采用喷射细化法和滴加法,制备了3种粒度的HMX粉末。采用激光粒度仪和扫描电子显微镜(SEM)对样品进行了表征,对其火焰感度、慢烤热感度及热分解特性进行了测试,并计算了3种HMX样品的热分解动力学参数及热爆炸临界温度。结果表明,随着HMX d_(50)的减小,HMX的火焰感度和慢烤热感度都逐步升高;而HMX的表观活化能和热爆炸临界温度随其d_(50)的增大而逐渐升高。

Three kinds of I-IMX samples with different particle size were prepared by spray fine and dripping methods respectively.Laser granularity measurement and scanning electron microscope （SEM） were employed to characterize the samples. The flame sensitivity, slow cook-off sensitivity and thermal decomposition characteristics of HMX samples were tested and analyzed. Moreover, the kinetics parameters of thermal decomposition and thermal explosion critical temperature for the three samples were also calculated. Results show that with the decrease of d50, the flame sensitivity and thermal sensitivity （slow cook-off sensitivity） of HMX all increase. Whereas, the activation energy and thermal explosion critical temperature of HMX increase with the increase of d50.