Abstract
The experimental investigations on the electrical explosion of aluminum, silver, tungsten and platinum wires are carried out. The dependence of the parameters related to the specific energy deposition on the primary material properties is investigated. The polyimide coatings are applied to enhance the energy deposition for the exploding wires with percent of vaporized energy less than unit. The characteristics of the exploding wires of different materials with and without insulating coatings are studied. The effect of wire length on the percent of vaporization energy for exploding coated wires is presented. A laser probe is employed to construct the shadowgraphy, schlieren and interferometry diagnostics. The optical diagnostics demonstrate the morphology of the exploding products and structure of the energy deposition. The influence of insulating coatings on different wire materials is analyzed. The expansion trajectories of the exploding wires without and with insulating coatings are estimated from the shadowgram. More specific energy is deposited into the coated wires of shorter wire length, leading to faster expanding velocity of the high-density products.
Highlights
The electrical explosion of metal wire plays a significant role in many application fields, such as wire-array Z-pinch,[1] nanoparticle generation,[2] material property investigation under extreme conditions[3] and shockwave technology for developing fossil energy,[4] etc
This paper presents the experimental investigations on the electrical explosion of Al, Ag, W and Pt wires without and with insulating coatings
The specific energy deposited into the bare metal wire decreases with the increasing of initial resistivity from Ag to Pt wires
Summary
The electrical explosion of metal wire plays a significant role in many application fields, such as wire-array Z-pinch,[1] nanoparticle generation,[2] material property investigation under extreme conditions[3] and shockwave technology for developing fossil energy,[4] etc. Numerous experiments of single wire and wire-array load have revealed that the high-density core persists until late into the discharge.[6,7,8] great efforts have been devoted to the investigations on the initiation of exploding wire.[9,10] Most of the investigations on the electrical explosion of thin metallic wires focus on the energy deposition during the resistive stage. The energy deposition is substantially enhanced for refractory and non-refractory metal wires when certain methods are applied.[17,18,19] The fully vaporized electrical explosion of bare tungsten wire in vacuum has been realized by inserting a flashover switch,[20] which is a technique for increasing the current rise rate.[21] The energy deposition, expansion rate and morphology of the current-driven explosions of several different wire materials have been reported
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