Production of the micron powders by the electric explosion of metallic fibers

Skryabin, A. S.; Pavlov, A. V.; Kartova, A. M.; Telekh, V. D.; Серов, М. М.; Sytchev, A. E.

doi:10.1088/1742-6596/1115/4/042017

Cited by 5 publications

(2 citation statements)

References 5 publications

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“…The intrinsic emission of the discharge was cut off by a narrow-band interference filter 21. The optical path lengths with an accuracy of 1 cm were aligned with a mirror 8 mounted on a graduated rail, which made it easier to reconfigure the circuit for different experiments [24,25]. Note that in our case interferograms of large aperture objects are recorded with a diameter of up to 200 mm.…”

Section: Fig2 Experimental Setupmentioning

confidence: 99%

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Laser holographic interferometry of short ultraviolet radiation with high power density interaction with condensed metters

Pavlov¹,

Protasov²,

Telekh³

et al. 2019

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The dynamics and macrostructure of near-surface vapor-plasma fluxes arising from condensed substances evaporation in the field of broadband radiation of the UV-VUV spectrum range are studied using double-exposure laser holographic interferometry and schlieren photography (the Toepler scheme in the light field mode). The experimental setup was created on the basis of the unique scientific facility "Beam-M". Broadband UV and VUV radiation was generated by a plasma-dynamic emitting discharge of an end geometry coaxial erosion-type magnetoplasma compressor with an ablating fluoroplastic plasma-forming insulating sleeve in a gas. To control the emission spectrum of the discharge, gas filters were used (Ar, Ne, air, Ne mixture with 5% air). The emitter operated in the following mode: U = 20 kV, the stored energy W = 3.6 kJ, the energy input to the discharge was up to 3.2 kJ, with 30% in the first half-cycle of current, the maximum current is 160 kA, the half-cycle of discharge is 6 μs; the total radiation energy from the discharge was 1.0-1.2 kJ; the fraction of radiation in the VUV range of the spectrum was about 50% in Ne (hν ≤ 20 eV) and about 45% in Ar (hν ≤ 16 eV). It was shown that the implemented scheme of electromagnetic compatibility and protection ensures reliable synchronization of the electric discharge circuit and optical diagnostics components in the whole range of discharge characteristics. Optical diagnostics of near-surface gas-plasma flows was implemented on the basis of a second harmonic (532 nm) of a solid-state Nd:YAG laser (Solar LQ-115), its versatility was shown for studying various pulsed plasma processes with characteristic changes in gas concentrations of about 10 17-10 18 cm-3 and gradients of 10 19-10 20 cm-3. On the schlieren-pictures and interferograms, the zones characteristic of the studied type of radiation effects on materials were recorded: the gas-dynamic evaporation mode was realized (plasma piston mode), there was a shock wave in the gas, the contact boundary between the shock-compressed gas and the vapor plasma. The analysis of interferograms indicates that the regime of developed evaporation was preceded by a regime of diffusion evaporation. The use of extended samples allowed us to observe successive stages in the development of gas-dynamic perturbations during evaporation (due to the different distances between the target areas and the discharge). On the interferograms above the target, at different distances from the source of irradiation, 3 types of gas-dynamic perturbations were observed: acoustic wave, simple wave (Riemann wave), and shock wave. The effect of the energy characteristics of the discharge and the spectral composition of the radiation on the evaporation pattern was experimentally shown.

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Section: Fig2 Experimental Setupmentioning

confidence: 99%

“…When Dk=1 we get ΔNAr=1,7•10 18 sm -3 . This density difference(ρ/ρ0= (ΔNAr+ N0)/N0=1, 24) corresponds to a Mach number equal М=1,15 (γ=5/3).…”

Section: Holographic Interferometrymentioning

confidence: 99%

Laser holographic interferometry of short ultraviolet radiation with high power density interaction with condensed metters

Pavlov¹,

Protasov²,

Telekh³

et al. 2019

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Experimental study of slow electrical explosion of thin titanium wires

Skryabin

Pavlov

Kartova

et al. 2019

J. Phys.: Conf. Ser.

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The paper presents results of experimental studies of a slow (during 50÷100 μs) electric explosion of thin titanium wires in argon and air media. In that explosion wire destruction and its fragmentation are complex processes associated with thermo-mechanical stresses and electromagnetic forces. The explosion was characterized by oscillography and photography. Schlieren photos of the explosion allowed to visualize features of the wire dispersion. It was demonstrated that the nature of wire defragmentation was determined by a specific energy input QR . At QR ≈1.2÷1. 5 J/mg wire fragmentation occurred with the formation of micron particles (with a diameter of 50÷150 μm). At QR ≈2.5÷2.8 J/mg forming of not only micron particles but also titanium nano powders due to electric arc ignition and extreme wire evaporation with the following non-equilibrium condensation. In the mode of high specific energy inputs generation of shock waves took place. The measured wave velocities reached of 700÷750 m/s. The manufactured titanium particles had purity of 96.65÷99.01 % as for raw wires.

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Holographic interferometry for the study of an electric explosion of titanium wires

Skryabin

Pavlov

Kartova

et al. 2019

J. Phys.: Conf. Ser.

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The paper presents the results of a slow (with a characteristic process time τ ≈ 50–100 μs) electric explosion (in an air medium) of thin (with a characteristic diameter δ ≈ 20–50 μm) titanium wires with holographic interferometry. A characteristic energy input into the wires was varied from 2.5 to 3.0 J·mg−1. The optical scheme of interferometry laser diagnostics was discussed. The formation of the main explosion features (shock front, explosion products, etc.) was registered. An interference shift allowed calculating of changing of a refractive index and a density in different zones of the explosion. The simplest estimations indicated that a density in shock compressed gas was varied from 1.1×1020 to 2.4×1020 cm−3.

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Production of the micron powders by the electric explosion of metallic fibers

Cited by 5 publications

References 5 publications

Laser holographic interferometry of short ultraviolet radiation with high power density interaction with condensed metters

Laser holographic interferometry of short ultraviolet radiation with high power density interaction with condensed metters

Experimental study of slow electrical explosion of thin titanium wires

Holographic interferometry for the study of an electric explosion of titanium wires

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