The ignition delay times t ign of propellants provide insight for the fundamental understanding of the ignition process. This study demonstrated a refined method to measure the t ign of ammonium-perchlorate-based propellants at pressures between 3.5 and 15.5 MPa. Both aluminized and nonaluminized ammonium perchlorate/hydroxyl-terminated polybutadiene composite propellants were studied with and without metal oxide nanoparticle catalysts. A CO 2 laser was used to obtain quantifiable and reliable ignition times over a 30–100 W power range. The t ign results were compared to literature values for similar power fluxes at comparable pressures and to a simple ignition model based on heat conduction. Catalytic additives were seen to modify the t ign , depending primarily on whether they impact the lower- or higher-temperature decomposition of ammonium perchlorate. Examining the effects of in situ titania nanoparticles on the ignition delay times led to the conclusion that the nano-additives only altered the ignition behavior of the aluminized samples, but had no effect on the nonaluminized ones. Conversely, when nano-sized Fe 2 O 3 was used, the t ign was halved at lower pressures. As a result, additives that assist in the low-temperature decomposition of ammonium perchlorate, such as Fe 2 O 3 , are believed to have the greatest impact on ammonium perchlorate/hydroxyl-terminated polybutadiene ignition delay times.


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    Title :

    Ignition Delay Times of Composite Solid Propellants Using Novel Nano-Additive Catalysts


    Contributors:

    Published in:

    Publication date :

    2018-07-27


    Size :

    12 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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