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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.v5.i1-6.530
pages 492-501

PROPERTIES OF ADN PROPELLANTS

May Lee Chan
Naval Air Warfare Center Weapons Division, China Lake, California USA
Russ Reed
Naval Air Warfare Center Weapons Division, China Lake, CA 93555-6100 USA
Alan D. Turner
Naval Air Warfare Center Weapons Division, China Lake, California USA
Alice I. Atwood
Naval Air Warfare Center Weapons Division, China Lake, CA 93555-6100 USA
P. O. Curran
Naval Air Warfare Center Weapons Division.China Lake, CA 93555-6001

ABSTRACT

Investigators at the Naval Air Warfare Center Weapons Division (NAWCWD), China Lake, Calif., have made two series of minimum-signature propellants formulated with either ammonium dinitramide (ADN) or a combination of ADN and hexanitrohexazaisowurtzitane (CL-20). Poly(diethyleneglycol-4,8-dinitraza undeconate) (ORP-2A)/nitrate ester (NE) and polycaprolactone polymer (PCP)/NE were used as the binders. These binders have shown to be excellent for propellant applications. Four propellants are currently under study—PCP/NE/ADN, PCP/NE/ADN/ CL-20, ORP-2A/NE/ADN, and ORP-2A/NE/ADN/CL-20. These propellants processed and cured well and, therefore, produced void-free samples. Propellant samples were prepared for burning rate evaluation in a window bomb apparatus. The results showed that CL-20/ADN propellants can sustain good burning rates at pressures up to 8000 psia. ADN/CL-20 propellants exhibited a bum rate around 1.7 to 2.1 cm/s at 6.89 MPa. In addition, propellants made with ADN as the sole oxidizer exhibited similar burning rates. Finally, the investigators compared the burning rates of propellant made with ADN prills versus those of propellant made with neat ADN solid. Energetic compositions containing ADN and exploded aluminum (ALEX), as well as the conventional H-5 spherical atomized powder, have been prepared with a polyalkylene oxide (PAO) polyether and a nitrate ester plasticizer. Compositions having fine recrystallized ADN (partially soluble in the melted PAO), ALEX, and H-5 aluminum were processible and gave well-cured composites. Microcinematography of burning samples revealed some agglomeration with a mixture of ALEX and H-5. The samples burning rates were determined using the window bomb technique; in addition, other safety and thermal properties were also measured.


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