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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Print: 2150-766X
ISSN Online: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v4.i1-6.540
pages 574-586

BALLISTIC AND MICROSTRUCTURAL PROPERTIES OF A HIGHLY FILLED GUN PROPELLANT WITH VARYING THICKNESSES OF INERT SURFACE COATING

S. M. Caulder
Indian Head Division, Naval Surface Warfare Center Indian Head, Maryland 20640-5035
F. S. Kim
Indian Head Division, Naval Surface Warfare Center Indian Head, Maryland 20640-5035
B. K. Moy
Indian Head Division, Naval Surface Warfare Center Indian Head, Maryland 20640-5035

ABSTRACT

A highly filled multiperforated gun propellant containing predominately RDX was spray coated on its surface with cellulose acetate butyrate (CAB). The coating thickness was either 1 or 2.4% by weight. The purpose of the coating was to lower the initial maximum peak pressure and impart a progressive burn rate to the gun propellant grains. The coated and uncoated propellant grains were combusted in a closed bomb. Pressure-time combustion curves were obtained. The homogeneity and thickness of the coatings were measured from photomicrographs and x-ray maps obtained using a differentially pumped scanning electron microscope (WET-SEM) equipped with a light element energy dispersive x-ray detector (EDS). The SEM and closed bomb results showed that the initial pressure-time ballistic traces could be lowered and retarded as a function of coating thickness.


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