Assessing the Mixedness of Composite Solid Rocket Propellants Using Fluorescent Particles

    Authors

    T. E. Sammet; M. A. Stephens; E. L. Petersen;B. A. Corbin

    Comments

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    Abbreviated Journal Title

    J. Propul. Power

    Keywords

    ADDITIVES; Engineering, Aerospace

    Abstract

    A new diagnostic technique was developed for assessing the effectiveness of mixing techniques of solid composite propellants using nanoparticle additives. The diagnostic uses nanosized quantum dots in suspension or micron-sized powders that are mixed into the propellant in place of the additives. Upon exposure to an ultraviolet light source, the particles fluoresce, hence serving as tracers to assess the uniformity of the mixture and therefore the effectiveness of the mixing procedure. Collection of the image using a digital camera provides data on intensity variations in the fluorescent signal, allowing for quantitative assessment of uniformity and mixedness. Various mixtures involving hydroxyl-terminated polybutadiene binder and ammonium perchlorate oxidizer were manufactured at various levels of mixing to test the diagnostic. In addition to confirming the uniformity of the nanosized particles using the target mixing procedure, variations in mixing quality and comparisons between mechanically and hand-mixed propellants showed distinct differences correlating to the mixedness of each propellant that was supported with data from burning rate studies. The present diagnostic can therefore also be used to assess the mixedness of propellants that do not contain nanoparticle additives. Other potential applications include curing agent dispersion assessment and linking homogeneity to mixedness and mechanical properties.

    Journal Title

    Journal of Propulsion and Power

    Volume

    26

    Issue/Number

    5

    Publication Date

    1-1-2010

    Document Type

    Article; Proceedings Paper

    Language

    English

    First Page

    987

    Last Page

    992

    WOS Identifier

    WOS:000282793500008

    ISSN

    0748-4658

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