Nanodispersed metal powders in high-energy condensed systems

Fedorov, S. G.; Guseinov, Sh. L.; Стороженко, П. А.

doi:10.1134/s1995078010090016

Cited by 15 publications

(8 citation statements)

References 10 publications

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“…The low level of AlB 2 is caused by its degradation at temperatures higher than 1000°С with the formation of aluminum and AlB 12 described by the reaction: 6AlB 2 → 5Al + AlB 12 [8]. The formation of other borides and the alloys of boron and aluminum can be excluded; their fractions vary depending on the content of the components in the starting mixture.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, many investigators have confirmed that using nanodispersive aluminum powder noticeably improved the operational and physical characteristics of rocket fuels [6][7][8]. Consequently, it can be supposed that the addition of nanodispersive powdered aluminum borides into HEC will also improve the performance of these compositions through the increase in the rate and efficiency of combustion of these components.…”

Section: Introductionmentioning

confidence: 99%

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Nanodispersive aluminum boride prepared by a plasma recondensation of aluminum and boron micron powders

et al. 2015

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This work presents investigations into the composition and some properties of nanodispersive powders of aluminum boride prepared by the plasma-recondensation technique. It is shown that, under a strictly determined aluminum : boron ratio in the starting mixture and with the complete observance of technological processing parameters, aluminum boride (n-AB) nanopowders of the required composition and dispersivity can be obtained. SEM investigations of the aluminum boride samples reveal that aluminum boride powders are mixtures of spherical particles of different sizes and a significant agglomeration of the particles is observed. In general, the sizes of particles are varied from several dozens of nanometers up to 500 nm and more. Investigations into the thermal-oxidative activity of synthesized aluminum boride using thermogravimetric and differential thermal analysis show that these compounds are more active towards air than nanodispersive aluminum. The highest rate of oxidation of aluminum borides was observed in the temperature range of 680-700°C.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanodispersive aluminum boride prepared by a plasma recondensation of aluminum and boron micron powders

et al. 2015

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“…The paraffin as phlegmatizer and the powder of aluminum for improving the energy are widely used in explosives mixtures and rocket propellants [1,2].…”

Section: Background and The Purpose Of Workmentioning

confidence: 99%

Thermal analysis of the mixtures of paraffin with aluminum in wide temperature range

Gubin

Maklashova

Levitskaya

2016

J. Phys.: Conf. Ser.

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Thermal analysis of IRT-T reactor fuel elements A Naymushin, Yu Chertkov, I Lebedev et al. Abstract. The mixtures and composites of wax, paraffin and metals are widely used as energy efficient formulations and phase change materials for heat storage. Aluminum is frequently employed in the formulations of many composite explosives or propellants. Metal fuel additives are used in advanced explosive formulations to achieve higher combustion temperatures and longer pressure pulses. In this project, Al-paraffin wax composite materials were prepared and characterized. The thermal stability of the prepared powders was determined by differential scanning calorimeter, simultaneous thermogravimetry analysisdifferential thermal analysis in the temperature range 30-1300˚С at atmospheric pressure. The results of differential scanning calorimeter showed that the thermal performance and structure of the composite materials are stable up to 200˚C.The paraffindecompositionwith an energy release is possible at temperatures over 200˚C and the oxidation of aluminum may be at a temperature above its melting point.It is shown that the maximum total amount of heat generated by the thermal decomposition of the composition was at the mass fraction of aluminum of 16% -18%. Background and the purpose of workThe paraffin as phlegmatizer and the powder of aluminum for improving the energy are widely used in explosives mixtures and rocket propellants [1,2].The purpose of work was study the process of thermal decomposition of the mixture of paraffin and aluminum powder micron dispersion by a simultaneous thermal analysis; the estimation of the activation energy of decomposition of paraffin and the determining the optimal percentage of mixture components for using as energy efficient formulations.Such mixtures are a promising material (phase change materials) in the field of energy saving for thermal batteries. To increase the heat capacity and thermal conductivity of the wax is added powder of aluminum [3,4]. Thus, the heat of fusion of paraffin wax is used for accumulation of thermal energy in thermal batteries [4], and high values of heat of formation and phlegmatizing properties of wax to allow its use in high-energy formulations [5,6].Note that the mixtures of aluminum powder with paraffin are flammable. With the destruction or loss of integrity device possible ignition and combustion of the mixture.Therefore, the study of thermal decomposition of the compositions of paraffin wax and aluminum powder should be performed in a wide range of temperature changes. At low temperatures up to 200°C the information is needed to manage the storage of thermal energy at higher temperatures will be useful for applying

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“…For example, Gogulya et al [8] performed a set of detonation pressure experiments for HMX/Al (85/15), the experimental results suggested that the CJ pressure increased with a decrease in the aluminum particle size from 7 mm to 150 mm. The study of Dorsett et al [9] and Fedorov et al [10] showed that ultrafine aluminum powder (Alex) burns more rapidly than conventional aluminum powders in TNT/Al, this increased rate of energy release leads to higher detonation pressures. Conversely, some works by Brousseau et al [11] and Trzciński et al [12] have shown that the smaller particle size of aluminum powders will absorb more energy in the detonation reaction zone because of their larger surface area, and this indicates that a smaller aluminum particle size is associated with a lower detonation pressure.…”

Section: Introductionmentioning

confidence: 99%

Effects of Aluminum Particle Size on the Detonation Pressure of TNT/Al

Zhou

Chen

Yuan

et al. 2017

Propellants Explo Pyrotec

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To better understand the influence of the aluminum particle size on the detonation pressure of TNT/Al, electrical conductivity experiment and detonation pressure experiment were performed in this study. Four types of TNT/Al were considered, in which the particle size of aluminum was 50 nm, 100 nm, 1.50 μm, and 9.79 μm, respectively. The combustion process of Al in TNT/Al was detected by electrical conductivity experiment, and the detonation pressures of TNT/Al were measured by using the manganin pressure sensors. According to the experimental results, the Chapman Jouguet (CJ) pressure of the explosive containing nano‐sized aluminum is higher than the explosive containing micron‐sized aluminum powder because of the combustion of nano‐sized aluminum in the detonation reaction zone. In addition, a smaller aluminum particle size in TNT/Al is associated with a slower detonation pressure attenuation. This study gives a clearer picture of how aluminum particle size contributes to detonation pressure on timescales from 0 to 0.82 μs.

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Nanodispersed metal powders in high-energy condensed systems

Cited by 15 publications

References 10 publications

Nanodispersive aluminum boride prepared by a plasma recondensation of aluminum and boron micron powders

Nanodispersive aluminum boride prepared by a plasma recondensation of aluminum and boron micron powders

Thermal analysis of the mixtures of paraffin with aluminum in wide temperature range

Effects of Aluminum Particle Size on the Detonation Pressure of TNT/Al

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