Direct ink writing (DIW) is a new trend in the micro-scale charging of energetic materials. In this study, a CL-20 based composite was prepared using DIW, and its properties were characterized. Results indicated that the particles of the composite are found at the sub-micron level, and a single layer measures at 2.4 mm. The composite has high density and low impact sensitivity, and its critical detonation size is around 1 3 0.4 mm. This feature will contribute to the detonation at the micro levelto a certain degree.
An emulsion is a multiphase dispersion system in which one or more liquids are dispersed in the form of particles in another immiscible liquid. Emulsion method has been applied for preparation of binder system via oil in water (O/W) emulsions. The formulation contains: 40 g 12 % a solution of polyvinyl alcohol (PVA) in water, 15 g 7.5 % a solution of Viton A (vinylidene hexafluoropropene copolymer) in ethyl acetate, 0.25 g sodium dodecyl sulfate (SDS) and 0.25 g Tween‐80.The emulsion as a binder system, sub‐micro CL‐20 (prepared by the ball milling method) as the body explosives to prepared CL‐20 based explosive ink (CL‐20 88 % concentration). Deposition of explosive inks via DIW technology and its properties were characterized. The results showed that the composite has fewer internal defects and low impact sensitivity, the crystal type has no change, critical detonation size is around 1×0.17 mm and detonation velocity is 8079 m/s.
Direct ink writing (DIW) of energetic materials has been an area of interest for micro size charge. In this work, 3, 4‐dinitrofurazanofuroxan (DNTF) based composite was prepared with nitrocotton (NC) and Viton as binders by DIW. Scanning Electro Microscope (SEM) and X‐ray diffraction were employed to characterize the composite samples. The impact sensitivity and thermal decomposition of the composites were also tested and analyzed. In addition, the critical size of detonation and detonation velocity were measured. The results show that DNTF based composite has a high density with whose value is 1.785 g cm−3, reaching 93.16 % of theoretical maximum density (TMD). The particles in composites are spheroidal with size ranging from 1 to 2 μm. Compared with raw DNTF, the obtained composite has a lower impact sensitivity and higher thermal stability. Moreover, the composites exhibit excellent detonation properties, whose critical size of detonation is around 0.01 mm and the mean detonation velocity is 8580 m s−1 at the charging width of 1 mm. Furthermore, part performances of this composite are contrasted with previous reported CL‐20 based composite and show better characters.
To explore a new manufacturing method in preparing energetic composites, an inkjet printing device possessing the ability of high precision and flexibility was utilized to deposit six 3,4-dinitrofurazanofuroxan and hexogen based explosive inks.
Direct ink writing (DIW), a promising technology for manufacturing energetic materials, has been a hot topic in the micro-scale charge of explosives. Herein, three kinds of pentaerythrite tetranitrate (PETN)-based all-liquid explosive inks were engineered and patterned using DIW. Scanning electron microscopy, energy-dispersive x-ray spectroscopy, X-ray diffraction, differential scanning calorimetry, and nanoindentation were used to characterize the printed samples. The density, thickness of single layer, impact sensi-tivity and critical size of detonation were measured and analyzed. Results show that PETN/EC/Viton exhibits excellent properties, specifically greater activation energy (148.09 KJ mol À1 ), elastic modulus (2.808 GPa), and characteristic height (49.9 cm, 2.5 kg), over the two other samples. Moreover, a directly deposited sample in small grooves can provide steady detonation above the size of 1 3 0.101 mm. These features all contribute to the application of microsize detonation to a certain degree.
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