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Continuous crystallization of ultra-fine energetic particles by the Flash-Evaporation Process

Abstract : High explosives, such as TNT or RDX, may be accidentally initiated under the influence of a strong mechanical impulse, great heat or an electrostatic discharge. Smallest impurities, open pores, entrapped gases or other inhomogeneities within the explosive matrix may convert the delivered energy into heat, causing the formation of a so called hot-spot. A hot-spot size of a few micrometers can already be sufficient to initiate a deflagration or even a detonation of the explosive. By decreasing the particle size of the explosive, the formation of hot-spots is inhibited, resulting in a less sensitive material. In this work, a continuous operating flash-crystallization process was developed, being able to produce energetic submicron particles in a multigram scale. The process bases on a spray drying process where superheated solutions are continuously atomized. A parametric study was performed on this process in order to decrease the particle size and obtaining a narrower particle size distribution. By means of this flash-crystallization process, highly homogeneous energetic composites were prepared in a large scale. The quality and amount of the energetic composite are unique. The versatility of the flash-crystallization process allows the preparation of a large number of energetic and inert substances and compositions
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https://hal.univ-lorraine.fr/tel-01749359
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Benedikt Risse. Continuous crystallization of ultra-fine energetic particles by the Flash-Evaporation Process. Food and Nutrition. Université de Lorraine, 2012. English. ⟨NNT : 2012LORR0144⟩. ⟨tel-01749359⟩

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