Facile Preparation and Properties Study of CL-20/TATB/VitonA Composite Microspheres by a Spray-Drying Process

Conghua Hou,Yuanping Zhang,Shimin Zhang,Xinlei Jia,Congcong Li

doi:10.1155/2020/8324398

Conghua Hou, Yuanping Zhang + Show 3 more

Open Access

https://doi.org/10.1155/2020/8324398

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Abstract

To improve the safety of ammonium nitrate explosives, a one-step method involving the formation of CL-20/TATB/VitonA composite microspheres using spray drying is presented. The crystal morphology, particle size, crystal structure, thermal properties, and sensitivity of raw materials of CL-20 and TATB, CL-20/VitonA particles, and CL-20/TATB/VitonA microspheres were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and impact and friction sensitivity tests. The SEM results show that the prepared CL-20/TATB/VitonA composites with micro-/nanoscale grain size have a good spherical shape. Thermal analysis data show that TATB coating enhances the thermal stability of CL-20/VitonA. The impact and friction sensitivity results show that superior mechanical properties of these composite microspheres could be maintained. Obviously, this approach is an effective desensitization technique to prepare composite microspheres for explosives.

Highlights

As technology and weapon systems continue to evolve, energetic materials should have high power, high precision, and long range for weapon firepower systems and maintain relatively high safety in other environments [1]
Existing explosives including 2,4,6,8,10,12hexanitro-2,4,6,8,10,12-hexaazaiso-wurtzitane(CL-20), 1,3,5,7teranitro-1,3,5,7-tetrazocine (HMX), and hexahydro-1,3,5trinitro-1,3,5-triazine (RDX) exhibiting high energy density, good heat resistance, stable detonation, and high detonation speed usually suffer from high mechanical sensitivity and poor shock wave sensitivity [2]
The results indicated that the cocrystal was a new substance rather than a mixture of raw materials, and it had excellent thermal stability, high energy release, and lower mechanical sensitivity

Summary

Introduction

As technology and weapon systems continue to evolve, energetic materials should have high power, high precision, and long range for weapon firepower systems and maintain relatively high safety in other environments [1]. TATB (1,3,5-triamino-2,4,6-trinitrobenzene) is an excellent insensitive explosive owing to its high melting point, high crystal density, low mechanical sensitivity, and good heat resistance. The results indicated that the cocrystal was a new substance rather than a mixture of raw materials, and it had excellent thermal stability, high energy release, and lower mechanical sensitivity. Due to the low thermal efficiency of this process, it was limited to a small number of products such as milk powder and egg powder; as technology and equipment continue to evolve, the application range of spray-drying technology has been continuously expanded It has been widely used in the chemical industry, food industry, pharmaceuticals and biochemical industry, material processing, and other fields. The formation mechanism, crystal morphology, structure, thermal properties, and sensitivity characteristics of composite microspheres were systematically investigated in detail

Experiment

Results and Discussion

Conclusion