冷却结晶制备毫米级球形黑索今

以环戊酮为溶剂，采用冷却结晶的方式制备出毫米级球形黑索今（RDX）晶体，并对溶液浓度、晶种的添加、结晶温度、降温速率、搅拌速率等工艺参数进行分析，对晶体密度、长短轴比、堆积密度以及机械感度进行了测试。结果表明：所获得的毫米级球形RDX晶体表面光滑、结构密实，晶体密度达到1.813 g/cm³，长短轴比≤1.21，堆积密度1.29 g/cm³；机械感度相比于普通RDX显著降低，摩擦感度从82%降低至62%，撞击感度从80%降低至52%.

Cooling Crystallization Method for Preparation of Millimeter-scale Spheroidized RDX

The millimeter-scales pheroidized RDX is prepared by cooling crystallization using cyclopentanone as a solvent. The effects of process parameters, such as solution concentration, addition of seed, crystallization temperature, cooling rate, and stirring rate, are investigated. The crystal density, axial ratio, bulk density, and mechanical sensitivity are tested. The results show that the millimeter-grade spheroidized RDX has smooth crystal surface and compact structure. The crystal density is 1.813 g/cm³, the axial ratio is less than 1.21, and the bulk density is 1.26 g/cm³. Its mechanical sensitivity is obviously lower than that of ordinary RDX, the friction sensitivity is decreased from 82% to 62%, and the impact sensitivity is decreased from 80% to 52%.