Effect of powdered aluminum additives on the detonation parameters of high explosives

Grishkin, A. M.; Dubnov, L. V.; Davidov, V. Yu.; Levshina, Yu. A.; Mikhailova, Tatiana

doi:10.1007/bf00755887

Cited by 24 publications

(10 citation statements)

References 3 publications

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“…Metal powders are widely used in physics of shock waves and in physics of explosion: shock-wave compaction [1], synthesis of new compounds and phases [2], metallized high explosives (HE) [3][4][5][6][7][8], shock-wave generators of superstrong magnetic fields [9][10][11][12], detonation compression of a magnetic flux [13], and current switches controlled by a shock wave or by a detonation wave [14].…”

Section: Introductionmentioning

confidence: 99%

Electrical Conductivity of Metal Powders under Shock Compression

Гилев

2005

Combust Explos Shock Waves

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The electrical conductivity of a series of metal powders under shock compression is measured by an electrocontact technique. Initially, the metal particles are covered by an oxide film, and the powder is non-conducting. Under shock compression, the powder acquires macroscopic conductivity. The electrical conductivity of the shockcompressed powder depends substantially on the metal, porosity, particle size, and shock-wave pressure. The macroscopic electrical conductivity behind the shock-wave front is uniform within the experimental error. The dependences for fine and coarse aluminum powders on the shock-wave pressure are found. It is demonstrated that these dependences are nonmonotonic. For high shock-wave pressures, the electrical conductivity of the substance decreases. This behavior is assumed to be related to strong temperature heating of the substance under shock compression. Estimates of temperature show that shock compression can induce melting and partial vaporization of the metal. The same is evidenced by the behavior of electrical conductivity whose value for fine particles is close to the electrical conductivity of the melt. The electrical conductivity of the coarse powder is heterogeneous because of the strong thermal nonequilibrium of the particle during shock compression. An analysis of results for different metals shows that the basic parameter responsible for electrical conductivity of the shock-compressed powder is the dimensionless density.

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Section: Introductionmentioning

confidence: 99%

Electrical Conductivity of Metal Powders under Shock Compression

Гилев

2005

Combust Explos Shock Waves

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“…In general, when detonation of an aluminized explosive occurs, due to the high melting point (2054 °C) [27] and/or the mechanical strength of the oxide shell, the aluminum particles react relatively slowly compared to the detonation processes. Aluminum behaves as an inert additive in the reaction zone and is oxidized in the expanding detonation products.…”

Section: Surface Temperature Of the Fireballmentioning

confidence: 99%

Experimental Study of the Explosion of Aluminized Explosives in Air

Chen¹,

Xu²,

Wu³

et al. 2016

Cent. Eur. J. Energ. Mater.

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Piezoelectric gauges were used to measure the shock wave overpressure of aluminized explosives and of a TNT charge. An infrared thermal-imaging spectrometer was used to collect the infrared signatures produced by the explosion fireball when the examined explosives were detonated. The measurement of the infrared signatures was used to estimate the surface temperatures and the dimensions of the fireball. Two aluminized explosive compositions (RDX/Al/AP and RDX/Al/B/AP) have been analyzed. 500 g charges of the aluminized explosives were prepared and studied, and their TNT equivalences were calculated according to the experimental data and the explosion law. The highest surface temperatures of the fireballs of these aluminized explosives were up to 1600 °C, which was higher than that of the TNT charge. In the region of the highest surface temperature above 700 °C, the duration for the composition RDX/Al/AP was about 232 ms (2.73 times more than TNT), whilst RDX/Al/B/AP was about 360 ms. The fireballs obtained from the explosion of these aluminized explosives had larger dimensions than that of TNT, especially when the surface temperature was above 1000 °C. The test results indicate that the addition of boron powders to aluminized explosives is a good way to enhance their blast effect, to improve the temperature of the explosion field and to prolong the duration of the higher temperature.

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“…Due to their larger surface area-to-volume ratio, it is theorized that the addition of nanometer-sized metal particles may strengthen detonation waves due to more rapid oxidation and the subsequent thermal transport to the explosive combustion gases. However, experimental results measuring the performance of metalized explosives have been inconclusive [7,24,16,15,19,25]. Some experiments indicate that mixtures containing metal nanoparticles reduce detonation speeds compared to standard micron-sized particles, while others suggest that detonation speeds can increase under certain conditions [47].…”

Section: Introductionmentioning

confidence: 99%