Formulation of CL‐20‐Based Explosive Ink and Its Detonating Transfer Performance in Micro‐Size Charge

Explosive ink in the micro-size charges of explosive circuits for energetic devices has attracted considerable interest. Herein, explosive ink with 90 wt.% of energetic solid was selected by testing the rheological properties of formulations with different CL-20 concentrations. Explosive ink suspensions with sub-micro CL-20 (2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane) as main explosive and fluorine-containing rubber/polyvinyl alcohol (PVA) emulsion as binder system were prepared. Direct ink writing (DIW) technology was used for the printing of the sample and for the loading of the explosive ink in a micro-size groove. The morphology and crystal type of the CL-20-based composite samples were characterized by SEM and XRD, and its detonating transfer performance in the micro-size groove were tested. Results show that the CL-20-based composite has a good molding effect, and the crystal type has not changed. The critical detonation thickness is around 11 mu m at 1.0 mm fixed width in the wedge tests, and the critical detonation size (cross section) is about 0.3 mmx0.3 mm. The detonation wave could continue to propagate around multiple 90 degrees corners. The maximum corner turning ability of the detonation wave is 140 degrees and the CL-20-based composite can detonate completely in a complex charge circuit.