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Initiation en détonation d'explosifs secondaires par des nanothermites : de la transition à la détonation d'un explosif secondaire nanométrique sous l'action d'une nanothermite à la transmission ultérieure de cette détonation à un explosif secondaire

Abstract : The main objective of this thesis is to initiate the detonation of secondary explosives (RDX, PETN, HMX) by using nanothermites, which are aluminothermic mixtures prepared from metallic oxides or sulfates. Detonating hybrid nanocomposites materials (NSTEX) were prepared by mixing a nanothermite with a secondary explosive, which is prepared in nanopowder by SFE process. The formation, the propagation and the modulation of detonation in NSTEX were studied from an experimental and conceptual standpoint. The transmission of NSTEX detonation to a secondary charge of pentaerythritol tetranitrate has confirmed that these new energetic materials can be used as initiating substances in place of lead-based primary explosives. A method to turn the loose powder of nanothermite into porous, solid foam was also developed. This research is of great importance for the future integration of nanothermites and NSTEX in pyrotechnic systems, because these materials are reactive only when they are porous, and on the other hand, they cannot be used at the state of loose powders.
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Cédric Martin. Initiation en détonation d'explosifs secondaires par des nanothermites : de la transition à la détonation d'un explosif secondaire nanométrique sous l'action d'une nanothermite à la transmission ultérieure de cette détonation à un explosif secondaire. Matériaux. Université de Strasbourg, 2017. Français. ⟨NNT : 2017STRAE023⟩. ⟨tel-01968044⟩

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