LLM-105/CL-20基高能钝感PBX的制备与性能表征

为满足含能材料高能钝感的要求,以CL-20为主体炸药,LLM-105为钝感剂,采用溶液水悬浮法制备了LLM-105质量分数分别为10%、20%、30%的3种LLM-105/CL-20基PBX。通过扫描电子显微镜(SEM)、粉末X射线衍射仪(PXRD)和差示扫描量热仪(DSC)对样品的形貌、晶体结构和热性能进行表征,并测试其机械感度;采用EXPLO5软件计算了其爆轰参数。结果表明,LLM-105/CL-20基PBX样品呈类球形,颗粒密实,粒径约为500μm;PBX中各组分的晶体结构未发生改变;3种配方的热安定性都较好,且随着钝感剂LLM-105含量的增加,LLM-105/CL-20基PBX的热爆炸临界温度呈递增趋势;与原料CL-20相比,3种LLM-105/CL-20基PBX的特性落高分别提高了25.88、33.68、37.18 cm,摩擦爆炸概率分别下降29%、38%、45%;LLM-105质量分数为10%的LLM-105/CL-20基PBX的特性落高与PBX-9501相当,而LLM-105质量分数为20%和30%的LLM-105/CL-20基PBX分别比PBX-9501高16.6%和25.12%;理论爆速分别高381.76、279.2、82.03 m/s。3种配方LLM-105/CL-20基PBX炸药的爆轰性能明显优于PBX-9501。

Preparation and Characterization of LLM-105/CL-20 Based High Energy Insensitive PBX

To meet the requirements for energetic materials with high energy and insensitivity,three types of LLM-105/CL-20 based PBXs with 10%,20%and 30%mass fractions of LLM-105,respectively,were prepared via aqueous slurrying method by using CL-20 as the main explosive and LLM-105 as the insensitive agent.The morphology,crystal structure and thermal properties of the samples were characterized by scanning electron microscopy(SEM),powder X-ray diffraction(PXRD)and differential scanning calorimeter(DSC),and their mechanical sensitivities were was also tested.EXPLO5 software was used to calculate their detonation parameters.The results show that the LLM-105/CL-20 based PBX samples are spherical with compact particles,and the particle size is about 500μm.The crystal structure of each component in PBX is unchanged,and all three formulations show good thermal stability.With the LLM-105 content increasing,the critical temperature of thermal explosion of PBXs increases.Compared with CL-20,the characteristic drop heights of impact sensitivity of three LLM-105/CL-20 based PBXs increase by 25.88,33.68,37.18 cm,respectively,and the probability of friction explosion decrease by 29%,38%and 45%,respectively.The detonation performances of LLM-105/CL-20 based PBX explosives with three formulations are obviously higher than that of PBX-9501.