Influence of insulating coating on aluminum wire explosions

Yang, Li; Sheng, Liang; Wu, Jian; Li, Xingwen; Zhao, Jianlong; Zhang, Mei; Yuan, Yuan; Bodong, Peng

doi:10.1063/1.4899042

Cited by 21 publications

(7 citation statements)

References 14 publications

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“…According to [178], the core expansion velocity at (d I/dt) av = 150 A/ns was (3-6) • 10 5 cm/s for bare wires made of Au, Cu, Ag, and Al and (0.4-1) • 10 5 cm/s for bare wires made of W, Mo, and Pt. Shi et al [19], Rousskikh et al [123], Zhao et al [172], Wu et al [173], [174], and Li et al [184] measured v core values similar to those reported in [168] and [178].…”

Section: B Core Structure (Core Expansion and Stratification And Micr...supporting

confidence: 55%

“…The experiments [19], [123], [172]- [175], [184] also demonstrated the effectiveness of increasing (d I/dt) av as a means of increasing the energy input into the wire. Table III shows the experimentally obtained values of ε dep /ε atom reported by various authors for W wires exploded at different values of (d I/dt) av .…”

Section: A Deposited Energymentioning

confidence: 81%

“…This type of voltage divider was proposed by Fletcher [183]. Voltage dividers of this type were used in the WE experiments reported in [19], [174], [175], and [184]. For a capacitive voltage probe, the response to a unit pulse can be described approximately as…”

Section: Experimental Arrangements For Studying the We In Vacuummentioning

confidence: 99%

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Wire Explosion in Vacuum

Oreshkin

Baksht

2020

IEEE Trans. Plasma Sci.

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This article presents a review of experimental and theoretical studies devoted to the processes that occur during explosions of wires in vacuum when the current densities in the wire are of the order of 10 8 A/cm 2 and the current density rise rates are no less than 10 15 A/(cm 2 • s). The theoretical background is focused on the transformation of the wire metal into ionized plasma. In particular, the basic physical notions used to describe wire explosions (WEs; state diagram, current action integral, and metal conductivity changes in phase transitions) are given; magnetohydrodynamic equations are described which are used to simulate WEs, and the simulation predictions are discussed together with their reliability. Extensive experimental data on WEs in vacuum are presented which made it possible to describe the corona and core formation and the development of electrothermal instabilities in the core. The data on the energy deposited in a wire exploding in vacuum reported by different authors are compared. In conclusion, problems are discussed that require additional experimental investigations, namely, the role of metastable states in a WE and the mechanism by which the core is shunted.

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Section: B Core Structure (Core Expansion and Stratification And Micr...supporting

confidence: 55%

Section: A Deposited Energymentioning

confidence: 81%

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Wire Explosion in Vacuum

Oreshkin

Baksht

2020

IEEE Trans. Plasma Sci.

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“…The gasification of single wires has been investigated, including by short, nanosecond length current pulses. Aluminum wires were relatively easy to be heated to a gaseous state due to their low atomization entropy, low electron emissivity, and the aluminum oxide layer covered on the surface of the wire, 7,8 while the gasification of the high-Z refractory elements was more difficult. With the help of insulated coatings, the atomization of the high-Z materials (e.g., tungsten and platinum) has been fulfilled partially.…”

mentioning

confidence: 99%

Atomization and merging of two Al and W wires driven by a 1 kA, 10 ns current pulse

et al. 2016

Physics of Plasmas

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Possibility of preconditioning of wires in wire array Z-pinch loads by an auxiliary low-level current pulse was investigated in experiments with two aluminum or two polyimide-coated tungsten wires. It was found that the application of a 1 kA, 10 ns current pulse could convert all the length of the Al wires (1 cm long, 15 μm diameter) and ∼70% of length of the W wires (1 cm long, 15 μm diameter, 2 μm polyimide coating) into a gaseous state via ohmic heating. The expansion and merging of the wires, positioned at separations of 1–3 mm, were investigated with two-wavelength (532 nm and 1064 nm) laser interferometry. The gasified wire expanded freely in a vacuum and its density distribution at different times could be well described using an analytic model for the expansion of the gas into vacuum. Under an energy deposition around its atomization enthalpy of the wire material, the aluminum vapor column had an expansion velocity of 5–7 km/s, larger than the value of ∼4 km/s from tungsten wires. The dynamic atomic polarizabilities of tungsten for 532 nm and 1064 nm were also estimated.

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“…Al nanoparticles have important applications in a variety of fields, e.g. explosives [13], propellants [14][15][16], electronics [17] and detection of biomolecules [18]. Lerner et al [19] investigated the electrical explosion process of Al wires in Ar and N, and synthesized Al and Al/AlN composite nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

A nanoparticle formation model considering layered motion based on an electrical explosion experiment with Al wires

Zhang

Gao²,

Xiao³

et al. 2022

Plasma Sci. Technol.

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In order to study the evolution of nanoparticles during aluminum wire electrical explosion, a nanoparticle formation model considering layered motion was developed, and an experimental system was set up to carry out electrical explosion experiments of 0.1 mm and 0.2 mm Al wires. The characteristic parameters and evolution process during the formation of nanoparticles were calculated and analyzed. The results show that the maximum velocities of the innermost and outermost layers are about 1200 m·s-1 and 1600 m·s-1, and the velocity of the middle layer is about 1400 m·s-1, respectively. Most of the nanoparticles are formed in the temperature range of 2600 ~ 2500 K. The characteristic temperature for the formation of aluminum nanoparticles is ~ 2520 K, which is also the characteristic temperature of other parameters. The formed nanoparticles diameter distribution ranging from 18 nm to 110 nm, and most of them are distributed near 22 nm.The variation of saturated vapor pressure determines the temperature distribution range of particle nucleation. There is a minimum critical diameter of particles (~ 25 nm), particles smaller than the critical diameter can grow into larger particles during surface growth. Particle motion has an effect on the surface growth and aggregation process of particles, and also on the distribution area of larger diameter particles. The simulation results are in good agreement with the experiments. It provides a method to estimate the size and distribution of nanoparticles, which is of great significance to understand the formation process of particles during the evolution of wire electrical explosion.

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Influence of insulating coating on aluminum wire explosions

Cited by 21 publications

References 14 publications

Wire Explosion in Vacuum

Wire Explosion in Vacuum

Atomization and merging of two Al and W wires driven by a 1 kA, 10 ns current pulse

A nanoparticle formation model considering layered motion based on an electrical explosion experiment with Al wires

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