Combustion of zirconium-containing model compositions of solid propellant

Alekseev, A. P.; Лемперт, Д. Б.; Nemtsev, G. G.; Nechiporenko, G. N.

doi:10.1134/s1990793111060169

Cited by 4 publications

(2 citation statements)

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“…In companion experimental activities [4], solid propellant formulations containing up to 40% Zr were found to burn stable over a range of pressure from 20 to 80 atm. Using Zr, it was possible to obtain burning rates and burning rate exponents close to the values typical of compositions based on Al.…”

Section: Progress In Propulsion Physicsmentioning

confidence: 99%

Ballistic effectiveness of Zr-containing composite solid propellants as a function of binder nature and mass fraction

Лемперт

Brambilla

DeLuca

2013

Progress in Propulsion Physics

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This paper considers the e¨ects of binder mass fraction on the properties of energetic formulations based on zirconium and zirconium hydride. These ingredients, replacing aluminum in solid rocket motors with low vehicle performance coe©cient, may increase the propellant ballistic e¨ectiveness, thanks to the resulting higher density and notwithstanding their lower speci¦c impulse. The propellant ballistic e¨ectiveness is estimated via the vehicle velocity achieved using the propellant under analysis in a real vehicle. For each speci¦c mission, the binder content can be varied to provide the optimal relationship between energetic and physical-mechanical properties, that is, one may sacri¦ce energy in favor of rheological and physicomechanical properties (increasing binder mass fraction), or vice versa. NOMENCLATURE SymbolsF V /M ¦n , vehicle performance coe©cient g 0 Reference gravity acceleration I ef E¨ective speci¦c impulse (see Eq. (1)) I sp Speci¦c impulse

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Section: Progress In Propulsion Physicsmentioning

confidence: 99%

Ballistic effectiveness of Zr-containing composite solid propellants as a function of binder nature and mass fraction

Лемперт

Brambilla

DeLuca

2013

Progress in Propulsion Physics

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“…Metal Zr has the advantages of high volumetric heat of combustion heat (77.77 kJ/cm 3 ), moderate ignition temperature (200~400 °C) and good burning stability. These advantages make Zr powder an important component in energetic materials such as propellants and pyrotechnics [1][2][3][4][5] . Previous studies demonstrated that ignition and combustion properties of pure Zr and Zr-containing energetic compositions could be significantly influenced by particle sizes or types of Zr.…”

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confidence: 99%

Effect of CNTs-Assisted Ball Milling on Morphology and Oxidation Behavior of Zr Powders

Kang

Zhu

Yang

et al. 2017

Rare Metal Materials and Engineering

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Morphology evolution and oxidation behavior of Zr powders milled with and without CNTs for different time were compared. XRD and SEM were used to determine the phase composition and morphology of obtained Zr and Zr/CNTs powders. Thermogravity (TG) analysis was applied to evaluate the thermal oxidation behavior of Zr and Zr/CNTs. Results show that the phase composition of Zr after milling is not influenced by adding CNTs, but the morphology and oxidation behavior of Zr are influenced. In case of milling without CNTs, particle size of Zr continues to reduce from more than 10 μm to about 2~3 μm when milling time increases from 1 h to 3 h. In case of CNTs-assisted milling, the particle size reduction of Zr is not obvious until milling time is prolonged to 3 h. This is because those CNTs adhered on the surface of Zr or CNTs-induced agglomerations among Zr prohibit the mechanical impact and fracturing effects of milling balls on Zr particles. Compared with direct milling of Zr, when the obtained Zr has similar particle size, adding CNTs lowers the onset oxidation temperature and peak exothermic temperature of Zr powders by 11~37 °C , depending on milling time. This is ascribed to the high heat conductivity of CNTs which favors heat transfer between Zr particles. At the same time, oxidative mass gain of Zr/CNTs is slightly lower than that of the corresponding pure Zr when milling time is less than 2 h and then this trend reverses. The initial decrease in mass gain of Zr in Zr/CNTs mixtures under shorter milling time is related to two factors: one is CNTs-induced agglomerations of Zr, which prohibits the contact of Zr with oxygen and thus decreases the degree of oxidation, and the other is the delayed particle size reduction of Zr in Zr/CNTs mixtures. The subsequent reversal in mass gain for pure Zr and Zr/CNTs is due to the positive effect of particle size reduction of Zr in Zr/CNTs on its thermal oxidation just began, while the spontaneous oxidation-induced negative effect for well-refined pure Zr has become very obvious.

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