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

ISSN Imprimer: 2150-766X
ISSN En ligne: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.2013005557
pages 427-449

COMBUSTION MECHANISM OF ENERGETIC BINDERS WITH NITRAMINES

Valery P. Sinditskii
Department of Chemical Engineering, Mendeleev University of Chemical Technology, Moscow, 125047, Russia
Viacheslav Yu. Egorshev
Department of Chemical Engineering, Mendeleev University of Chemical Technology, 9 Miusskaya Sq., 125047, Moscow, Russia
Valery V. Serushkin
Department of Chemical Engineering, Mendeleev University of Chemical Technology, Moscow, 125047, Russia
Sergey A. Filatov
Department of Chemical Engineering, Mendeleev University of Chemical Technology, Moscow, 125047, Russia
Anton N. Chernyi
Department of Chemical Engineering, Mendeleev University of Chemical Technology, 9 Miusskaya Sq., 125047, Moscow, Russia

RÉSUMÉ

The paper describes the results of a combustion study of the binary compositions of nitramines [tetranitrotetraazacyclooctane (HMX), trinitrotriazacyclohexane (RDX), tetranitrotetraazabicyclooctane (Bi-HMX), hexanitrohexaazaisowurtzitane (CL-20)] with two nitro ester binders, in which combustion complies with two different mechanisms; i.e., a gas-phase mechanism for volatile ener¬getic materials and a condensed-phase mechanism. It is shown that in compositions in which the binder is characterized by gas-phase combustion, HMX in concentrations up to 50% acts as an inert additive. Depending on the size and concentration of the HMX particles, three types of combustion of the mixtures can be identified; i.e., combustion along the binder interlayer, combustion as a single system, and combustion with a coolant. At higher nitramine concentrations, combustion control passes to nitramine and the burning-rate controlling reaction occurs in the liquid phase of nitramine. Only two combustion models are realized in the case of the binary compositions of a volatile binder with nitramines, which are less stable and burn faster than HMX (Bi-HMX and CL-20); i.e., the mixtures can burn either by a model with fast-burning additives or as a single unit. For the binary compositions of RDX and HMX with the binder, in which combustion obeys the condensed-phase mechanism, the model with fast-burning additives can be realized for a narrow set of conditions. The compositions mostly burn only as a single unit, and the addition of nitramine increases the burning rate of nitro ester by transferring heat from the overlying zone to the condensed phase.