Productions of Ultra‐Fine Powders and Their Use in High Energetic Compositions

Ivanov, Yu. F.; Osmonoliev, Mirswan N.; Sedoi, V. S.; Архипов, В. А.; Бондарчук, С. С.; Vorozhtsov, Alexander; Коротких, А. Г.; Kuznetsov, V. T.

doi:10.1002/prep.200300019

Cited by 137 publications

(66 citation statements)

References 15 publications

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“…Al microparticles (Sibthermochim, Russia) were produced using the wire explosion method [14], with an average particle size (D [3,4]) of 3.50 lm. Particles are spherical, with a narrow particle size distribution (D10 = 1.5 lm; D50 = 3.19 lm; D90 = 6.18 lm).…”

Section: Methodsmentioning

confidence: 99%

Oxidation of Micro-Sized Aluminium Particles: Hollow Alumina Spheres

et al. 2013

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Oxidized aluminium microparticles have recently been proposed for manufacturing new, environmentally-friendly, protective coatings on stainlesssteels and Ni-base alloys. The oxidation mechanisms of spherical aluminium microparticles of an average particle size of 3.5 lm were studied. Accordingly, simultaneous differential thermal analysis-thermogravimetry tests were carried out in air at different temperatures, always above aluminium melting temperature. Scanning electron microscopy and XRD were also used for the interpretation of results. Weight gain and energy results were explained in terms of the different structural changes taking place in aluminium particles. Dehydroxylation process was identified. The transformation of amorphous alumina to c-Al 2 O 3 was numerically evaluated and the alumina phase transformation (c-Al 2 O 3 ?a-Al 2 O 3 ) was also studied. The temperature ranges revealed the appearance of metastable phases (h-Al 2 O 3 ). Complete oxidation of particles can be obtained at 1,300°C in \1 h, although this also takes place at lower temperatures if enough oxidation time is used. Activation energy of oxidation process at high temperature was also estimated, taking a value of 334 kJ/mol. High temperature oxidation causes the formation of hollow alumina spheres, without any aluminium left inside them.

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Section: Methodsmentioning

confidence: 99%

Oxidation of Micro-Sized Aluminium Particles: Hollow Alumina Spheres

et al. 2013

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“…where: m − mass of the powder taken for testing, g, and V − volume occupied by the powder in the measuring cylinder, cm 3 . The powder X-ray diffraction (XRD) of the NAP samples was measured in an X-ray Diffractometer (X´Pert PRO Panalytical and Bruker D8 advance) with a Cu Kα source at a measurement angle range 2θ = 20-70º.…”

Section: Characterization By Instrumental Methodsmentioning

confidence: 99%

“…where: SA − surface area of NAP samples, m 2 /g; d − density of aluminium (2.7 g/cm 3 ). The results are summarised in Table 3.…”

Section: Surface Area Analysismentioning

confidence: 99%

“…However, its full potential has not been exploited because of the incomplete combustion of Al and its extensive oxidation prior to combustion. This problem is somewhat mitigated with the use of NAP and the current research reveals that addition of NAP to composite propellants results in improvements in the burn rate and specific impulse (Isp), as well as in high explosive formulations to enhance the detonation properties and the underwater performance [1][2][3][4][5][6][7][8][9][10][11][12]. Various techniques are used to prepare NAP and these are divided into high temperature and low temperature processes.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Nano Aluminium Powder (NAP) using a Thermal Plasma: Process Development and Characterization

Pant¹,

Seth²,

Raut³

et al. 2016

Cent. Eur. J. Energ. Mater.

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A bottom up approach for the preparation of Nano Aluminium Powder (NAP) using a Transferred Arc Thermal Plasma Reactor (TAPR) is described. The aluminium block is subjected to evaporation by the application of a thermal plasma. The aluminium vapour produced is rapidly quenched to room temperature resulting in crystallization of the aluminium vapour in nano-particulate form. Various process parameters, such as the plasma torch power, reactor pressure and plasma gas composition were optimized. This paper also describes the characterization of NAP by analytical methods, for the estimation of the Active Aluminium Content (AAC), Total Aluminium Content (TAC), XRD, bulk density, BET surface area, HR-TEM etc. The results are compared with those for samples prepared in other thermal plasma reactors, such as the DC Arc Plasma Reactor (DCAPR) and the RF Induction Thermal Plasma Reactor (RFITPR), and for commercially available NAP samples (ALEX, prepared by the EEW technique).

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“…Particle cohesion phenomena during storage/ manufacturing yield the formation of large particle clusters instead of the desired nanosized powders. Moreover, nAl powders produced by EEW are subjected to sintering due to wire explosion during the production phase [30]. Dedicated studies are under progress at SPLab in order to lessen/avoid these phenomena by implementing proper dispersion techniques.…”

Section: Energetic Additive Dispersionmentioning

confidence: 99%

Time-resolved regression rate of innovative hybrid solid fuel formulations

Paravan

Reina

Sossi

et al. 2013

Progress in Propulsion Physics

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Low regression rates limit application of hybrid rocket engines (HREs). In this paper, combustion of HTPB-and solid para©n wax-based fuels is investigated in a lab-scale burner by a time-resolved optical technique. The e¨ects of pressure are explored over the range 7 to 16 bar. Nanosized (ALEX TM , 100 nm, uncoated) and micronsized (MgB composite, 5 µm) metal additives are tested. For all runs, the instantaneous regression rate is not constant but higher at the beginning of tests. Overall, MgB performance and relatively ease of manufacturing enable to consider this additive as an interesting novel candidate to enhance hybrid rocket engines performance. NOMENCLATUREA space-averaged value (of parameter A) A time-averaged value (of parameter A) 2D two-dimensional a multiplicative factor [Eqs. (1) and (5)

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Productions of Ultra‐Fine Powders and Their Use in High Energetic Compositions

Abstract: Fine and ultra‐fine powders are actively studied in pyrotechnics, explosives and propellants. The important questions are how to produce a powder with specified characteristics and how to use the powder produced.

Cited by 137 publications

References 15 publications

Oxidation of Micro-Sized Aluminium Particles: Hollow Alumina Spheres

Oxidation of Micro-Sized Aluminium Particles: Hollow Alumina Spheres

Preparation of Nano Aluminium Powder (NAP) using a Thermal Plasma: Process Development and Characterization

Time-resolved regression rate of innovative hybrid solid fuel formulations

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