【摘要】 以丙酮为溶剂,采用喷雾干燥法制备了微米级球形RDX,研究了入口温度、进料速率、喷雾气体流速和溶液浓度对所得RDX颗粒形貌的影响。通过扫描电镜(SEM)分析了不同工艺条件下制备的RDX的球形化效果,用DSC分析了其热分解特性,并测试了其撞击感度。结果表明,制备球形RDX的最佳工艺条件为:入口温度为60℃,进料速率为1.5mL/min,喷雾气体流速为357L/h,原料RDX质量分数为1.9%,抽气流速为40m3/h。在此工艺条件下,获得了中值粒径为2.82μm、表面较光滑的球形RDX颗粒。与原料RDX相比,球形RDX的热分解表观活化能降低了2.33kJ/mol,特性落高从19.98cm升至54.70cm,表明球形RDX的撞击感度明显降低。更多还原

【Abstract】 The spherical micron RDX particles were prepared by the spray drying method using acetone as solvent.The effects of entrance temperature,feed rate,spraying gas flow rate and solution concentration on the morphology of RDX particles obtained were investigated.The spherical effects of RDX prepared under different process conditions were analyzed by scanning electron microscopy(SEM).Thermal decomposition characteristics of the samples were analyzed by DSC.The impact sensitivity of the samples was measured.Results show that the optimum conditions of preparing spherical RDX were determined as:entrance temperature of 60℃,feed rate of 1.5mL/min,spraying gas flow rate of 357L/h,raw RDX mass fraction of 1.9%,pumping flow rate of 40m3/h.Under these process conditions,smoothing-spherical RDX particles with the median particle size of 2.82μm were obtained.Compared with raw RDX,the apparent activation energy of thermal decomposition of the spherical RDX reduces by2.33kJ/mol.The characteristic drop height increases from 19.98 cm to 54.70 cm,revealing that the impact sensitivity of the spherical RDX is obviously decreased.更多还原