Iranian Scientific Association of Energetic Materials

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Pyrolants are an important class of energetic materials which because of the high energy content and the solid fused residues, serve a remarkably wide range of military and civilian applications. Pyrolant incendiaries can be either fuel rich or provide a surplus of oxidizer to facilitate combustion of a target substrate. The requirements and characteristics of an incendiary pyrolant not clearly identified. However, the heat of reaction, thermal kinetic data and macroscopic combustion parameters are of the basic requirements for the designing of these compounds. In this work, for the first time, the multicomponent Al/MnO2/PTFE pyrolant is introduced as an incendiary charge. Thermal reaction kinetics (activation energy, frequency factor, critical temperature and self-accelerating decomposition temperature) were studied with differential scanning calorimetry (DSC). Also this work investigations the macroscopic combustion behaviors (such as flame speed and ignition delay time) along with experimental results focusing on open burn experimental setup. Results indicate that the incorporation of nano-Al higher than 30%, significantly reduces ignition temperatures and produces unique reaction behavior that can be attributed to a different chemical kinetic mechanism than observed with micron-Al particles.

Keywords: Pyrolant, Thermal kinetic, Ignition delay time, Combustion velocity, Nano-Al, MnO2

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