ABSTRACT Solvent–antisolvent recrystallization produced ~8 µm average size RDX particles (UF-RDX) that were subsequently subjected to mechanical methods of ultrasonication and ball-milling to find further achievable reduction in particle size. Long duration ultrasonication for 20 h and 300 rpm ball milling for 4 h of UF-RDX decreased its average particle size to ~2 µm. RDX produced by all the three processes (solvent–antisolvent recrystallization, ultrasonication and ball-milling) was similar to coarser RDX in structure and thermal decomposition behavior. However, UF-RDX produced by solvent–antisolvent recrystallization was significantly less impact sensitive than that produced by ball-milling and ultrasonication. The issues of residual solvent and the metal contamination during RDX processing were addressed by process parameter optimization. Solvent–antisolvent recrystallization and mechanical methods even when used sequentially could not bring average particle size of RDX to nano-scale.

中文翻译：

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通过溶剂-反溶剂重结晶和机械方法的顺序应用来减小 RDX 的粒径

摘要溶剂-反溶剂重结晶产生~8 µm 平均尺寸的RDX 颗粒（UF-RDX），随后对其进行超声处理和球磨等机械方法，以进一步减小颗粒尺寸。UF-RDX 的长时间超声处理 20 小时和 300 rpm 球磨 4 小时将其平均粒径降低至约 2 µm。通过所有三种工艺（溶剂-反溶剂重结晶、超声处理和球磨）生产的 RDX 在结构和热分解行为上与较粗的 RDX 相似。然而，溶剂-反溶剂重结晶法制备的 UF-RDX 的冲击敏感性明显低于球磨和超声法制备的 UF-RDX。通过工艺参数优化解决了 RDX 加工过程中的残留溶剂和金属污染问题。