Electrostatic discharge ignition of nanocomposite thermites prepared by Arrested Reactive Milling was investigated. The powders 2Al–3CuO and 8 Al - MoO 3 were placed in a sample holder and subjected to an electrostatic discharge from a discharging capacitor. Their optical emission was monitored. Two ignition modes were detected: immediate ignition of individual particles and delayed ignition of a cloud of aerosolized powder. Experiments addressed the effects of material composition and morphology, aging, energy input, layer thickness, and environment on the ignition mode and ignition delays. Prepared thermites were blended with pure metal powders to study ignition of such blends. Individual particle ignition was observed for samples prepared as monolayers in air and argon and for any samples in vacuum. For thicker samples in air and in argon, a delayed powder ignition mode was observed. The delays varied from 10 μ s to several milliseconds. Powders of 2Al–3CuO had shorter ignition delays compared with 8 Al - MoO 3 . For both materials, delays decreased for the powders prepared using longer milling times. For 2Al–3CuO, aged powders ignited after longer delays compared with the freshly prepared powders; however, shorter delays were observed for the aged 8 Al - MoO 3 . Electrostatic discharge energy and layer thickness (except for a monolayer) did not affect the ignition delay. Blending nanocomposite thermites with Al and Ti powders reduced their electrostatic discharge ignition sensitivity and caused longer ignition delays.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Ignition of Fully Dense Nanocomposite Thermite Powders by an Electric Spark


    Contributors:

    Published in:

    Publication date :

    2014-05-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





    THERMAL INITIATION OF CONSOLIDATED NANOCOMPOSITE THERMITE POWDERS

    Stamatis, D. / Dreizin, E. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2011


    Thermal initiation of consolidated nanocomposite thermite powders

    Stamatis, Demitrios / Dreizin, Edward | AIAA | 2011


    Fully Dense Al-CuO Nanocomposite Powders for Energetic Formulations

    Stamatis, Demitrios / Dreizin, Edward | AIAA | 2008


    Fully Dense Al-CuO Nanocomposite Powders for Energetic Formulations

    Stamatis, D. / Dreizin, E. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2008