Exploding foil actuator based on coupling of electro-explosive and magnetic isentropic compression

Abstract

The application belongs to the technical field of initiation, and particularly relates to an explosive foil chip based on coupling of electric explosion and magnetic isentropic compression. The explosive foil chip comprises a substrate, a metal layer in a whole C shape, a flyer layer arranged on the metal layer, an acceleration bore arranged on the flyer layer and a top layer pad; a bridge area and a transition area are arranged on one side of the metal layer, and a lower electrode and a pad are arranged on the other side of the metal layer; a magnetic core is embedded in a region close to the bridge area of the metal layer on the substrate; the top layer pad is electrically connected with the metal layer through a via; the lower electrode is arranged on the lower surface of the substrate; the size of the lower electrode satisfies the requirement of covering the corresponding region of the bridge area; the pad is grounded; and the top layer pad is connected with the positive pole of a pulse power supply. The explosive foil chip couples the metal foil electric explosion and the magnetic isentropic compression together, provides additional power for the initial stage of flyer driving, and further improves the terminal speed of the flyer, thereby providing a new means for generating high-speed flyers.

Description

Technical Field

[0001] This invention belongs to the field of detonation technology, specifically relating to an explosive foil chip based on electro-explosion and magnetic isentropic compression coupling. Background Technology

[0002] To study the state and properties of materials under high temperature and high pressure, dynamic high-pressure loading methods are often required, such as magnetic isentropic compression, electric arc guns, and high-intensity laser radiation. These methods all rely on high-speed flying plates impacting the material to achieve dynamic high pressure loading. The principle of an electric arc gun is to use the plasma generated by the electro-explosion of a metal bridge foil to shear and drive the flying plate. The most representative of these methods is the explosive foil initiation technology. Its working principle is that the metal bridge foil undergoes an electro-explosion due to Joule heating under the action of a pulsed high current. The high-temperature and high-pressure plasma generated by the electro-explosion shears and drives the flying plate. The flying plate moves along the acceleration barrel and impacts the explosive at a certain speed, thereby initiating the detonation.

[0003] Currently, methods to improve the launch capability of flying wafers focus on the following aspects: performance enhancement of high-voltage capacitors and high-voltage switches, optimization of discharge circuits (reducing parasitic resistance, inductance, and other parameters), optimization of parameter matching design of various components of the flying wafer launcher, and improvement of the manufacturing process of the flying wafer launcher. Due to the limitations of the principle of the electro-explosion drive device, researchers can only improve the launch capability of flying wafers by increasing the energy storage level of capacitors based on existing technology. As the difficulty of experimental equipment and manufacturing technology continues to increase, further improvement of the launch capability of flying wafers has reached a bottleneck. Summary of the Invention

[0004] The purpose of this invention is to provide an explosive foil chip based on electro-explosion and magnetic isentropic compression coupling.

[0005] The technical solution to achieve the purpose of this invention is: an explosion foil chip based on electro-explosion and magnetic isentropic compression coupling, comprising a substrate, a metal layer in the shape of an overall C, a flyer layer disposed on the metal layer, an acceleration chamber disposed on the flyer layer, and a top-layer pad.

[0006] The metal layer has a bridge area and a transition area on one side, and a lower electrode and a pad on the other side. A magnetic core is embedded in the area of ​​the substrate near the bridge area of ​​the metal layer. The top pad is electrically connected to one end of the metal layer through a via. The lower electrode is set on the lower surface of the substrate. The size of the lower electrode is sufficient to cover the corresponding area of ​​the bridge area. The pad is grounded, and the top pad is connected to the positive terminal of the pulse power supply.

[0007] Furthermore, the substrate serves as a reflective backplate, confining the plasma generated by the electric explosion to move upwards, and also acts as a carrier for the magnetic core, increasing the permeability of the region.

[0008] Furthermore, the substrate is made of organic or ceramic materials and has a thickness of 1 mm or more.

[0009] Furthermore, the core material is a magnetic powder core, an iron-silicon-aluminum core, and / or a ferrite core.

[0010] Furthermore, the current density is highest at the metal layer bridge region, which is the explosive foil; the transition region of the metal layer is the area where the bridge region widens from narrow to wide, the bridge region is the area of ​​electrical explosion, and the lower electrode is the area that generates magnetic pressure on the bridge region.

[0011] Furthermore, the material of the metal layer is Cu, Au, Ag, or Al.

[0012] Furthermore, the material of the flyer layer is polyimide, polychloro-p-xylene, or ceramic.

[0013] Furthermore, the acceleration chamber is made of ceramic or organic materials.

[0014] Furthermore, the inner surface of the via is coated with a conductive material, enabling electrical connection between the top pad and the metal layer.

[0015] Compared with the prior art, the significant advantages of this invention are:

[0016] (1) The metal layer of the present invention is designed as a “C” shaped structure. Based on the traditional electric explosion loading device that relies on the high temperature and high pressure plasma generated by the electric explosion to accelerate the flying piece, the pulsed large current flowing through the lower electrode generates magnetic pressure on the bridge area, providing additional power for the initial stage of the flying piece drive. It combines magnetic isentropic compression and electric explosion to improve the terminal speed of the flying piece. Compared with the existing technology that only relies on electric explosion to accelerate the flying piece, this method improves the structure of the electric explosion acceleration device, realizes the coupling of metal electric explosion and magnetic isentropic compression, and increases the speed limit of the flying piece launched by the electric explosion acceleration device.

[0017] (2) The present invention embeds a magnetic core in the substrate, which can enhance the strength and stiffness of the reflective surface; at the same time, as a magnetic medium, it enhances the magnetic pressure generated by the pulsed high current on the bridge region, making the effect of magnetic isentropic compression more obvious. Attached Figure Description

[0018] Figure 1 This is a three-dimensional view of the explosion foil integrated chip based on the principle of electro-explosion and magnetic isentropic compression discharge coupling of the present invention.

[0019] Figure 2 This is a top view of the explosion foil integrated chip based on the principle of electro-explosion and magnetic isentropic compression discharge coupling of the present invention.

[0020] Figure 3This is a partial structural diagram of the explosive foil integrated chip based on the principle of electro-explosion and magnetic isentropic compression discharge coupling of the present invention. Among them, (a) is a three-dimensional view of the substrate with magnetic core, (b) is a top view of the substrate with magnetic core; (c) is a three-dimensional view of the metal layer prepared by chemical etching of the substrate, (d) is a top view of the metal layer prepared by chemical etching of the substrate; (e) is a three-dimensional view of the acceleration chamber, (f) is a top view of the acceleration chamber; (g) is a three-dimensional view of pressing the etched substrate, flyer layer and acceleration chamber together, and (h) is a top view of pressing the etched substrate, flyer layer and acceleration chamber together.

[0021] Figure 4 This is a schematic diagram of the metal layer of the explosion foil integrated chip based on the principle of electro-explosion and magnetic isentropic compression discharge coupling of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1-Substrate, 1-1-Magnetic core groove, 1-2-Magnetic core, 2-Metal layer, 2-1-Transition region, 2-2-Bridge region, 2-3-Lower electrode, 2-4-Pad, 3-Flying chip layer, 4-Accelerating chamber, 4-1-Through hole, 5-Top layer pad, 6-Via. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings.

[0025] This invention discloses an integrated chip combining electro-explosion and magnetic isentropic compression coupling with an explosive foil. Building upon traditional electro-explosion loading devices that rely on high-temperature, high-pressure plasma generated by an electro-explosion to accelerate the flying piece, this invention utilizes a pulsed high-current flowing through a special structure to generate magnetic pressure in the bridge foil region, providing additional power for the initial stage of flying piece driving. This combines magnetic isentropic compression and electro-explosion to improve the terminal speed of the flying piece.

[0026] This invention innovatively couples the electro-explosion of metal bridge foil with magnetic isentropic compression by improving the structure of the electro-explosion loading device, greatly increasing the speed of the flying piece. The invention improves the structure of the traditional exploding foil by embedding a magnetic core 1-2 inside the substrate 1. In use, the top layer pad 5 is connected to the positive terminal of the high-voltage pulse power supply, and the metal layer pads 2-4 are connected to the ground terminal. When the high-voltage capacitor in the electro-explosion circuit discharges, generating a large pulse current, an electro-explosion occurs in the bridge region 2-2. The high-temperature, high-pressure plasma generated by the electro-explosion drives the flying piece. Simultaneously, the large pulse current flowing through the lower electrode 2-3 generates magnetic pressure on the bridge foil region, providing additional power in the initial stage of flying piece driving, increasing the initial speed of the flying piece, and achieving the coupling of electro-explosion and magnetic isentropic compression.

[0027] The main structure of the chip includes: substrate 1, metal layer 2, flyer layer 3, acceleration chamber 4, and top layer pad 5. Substrate 1 serves as a reflective backplate, confining the plasma generated by the electro-explosion upwards, and also acts as a carrier for the magnetic core 1-2, increasing the permeability of the area. Metal layer 2 comprises four parts: transition region 2-1, bridge region 2-2, lower electrode pad 2-3, and pad 2-4. The current density is highest at bridge region 2-2, which is the explosion foil. The flyer layer 3 can be made of materials such as polyimide, polychloro-4-methyl-3-methyl, and ceramics. The acceleration chamber 4 is the channel for accelerating the flyer. The acceleration chamber 4 can be made of ceramic or organic materials through different processes.

[0028] The magnetic core 1-2 is embedded in the upper center of the substrate 1, close to the bridge region. Its function is to increase the permeability of the area and increase the magnetic pressure generated by the current on the bridge region. The magnetic core material can be magnetic powder core, iron-silicon-aluminum magnetic core, or ferrite core. The dimensions of the magnetic core 1-2 need to be adjusted according to the specific parameters of the designed explosion foil chip.

[0029] The substrate 1 can withstand the shock wave generated by the electrical explosion, constrain the upward movement of the plasma generated by the electrical explosion of the metal layer, and also serves as the carrier for the magnetic core 1-2. Its material can be organic or ceramic, and its thickness needs to be adjusted according to the specific parameters of the designed explosive foil chip, generally greater than or equal to 1 mm.

[0030] The metal layer 2 comprises four parts: a transition region 2-1, a bridge region 2-2, a lower electrode pad 2-3, and a pad 2-4. The transition region 2-1 is the area on both sides of the bridge region 2-2 that widens from narrow. The bridge region 2-2 is the main area for electro-explosion. The lower electrode 2-3 is the main area that generates magnetic pressure on the bridge region. The dimensions (length, width, and thickness), shape, and material of the bridge region 2-2 can be designed according to specific requirements. The material of the metal layer 2 is Cu, Au, Ag, or Al.

Claims

1. An explosive foil chip based on electro-explosion and magnetic isentropic compression coupling, characterized in that, It includes a substrate (1), a C-shaped metal layer (2), a flyer layer (3) disposed on the metal layer, an acceleration chamber (4) disposed on the flyer layer (3), and a top-layer pad (5). The metal layer (2) has a bridge area (2-2) and a transition area (2-1) on one side, and a lower electrode (2-3) and a pad (2-4) on the other side. A magnetic core (1-2) is embedded in the area of ​​the substrate (1) near the bridge area of ​​the metal layer. The top pad (5) is electrically connected to one end of the metal layer (2) through a via (6). The lower electrode (2-3) is located on the lower surface of the substrate. The size of the lower electrode (2-3) is sufficient to cover the corresponding area of ​​the bridge area (2-2). The pad (2-4) is grounded. The top pad (5) is connected to the positive terminal of the pulse power supply. The substrate (1) serves as a reflective backplate, which constrains the plasma generated by the electric explosion to move upward. It also serves as a carrier for the magnetic core (1-2), increasing the permeability of the region. The substrate (1) is made of organic or ceramic materials and has a thickness of 1 mm or more; The current density is highest at the bridge region (2-2) of the metal layer (2), which is the explosive foil; the transition region (2-1) of the metal layer is the area where the bridge region (2-2) widens from narrow to wide on both sides; the bridge region (2-2) is the area of ​​electric explosion; and the lower electrode (2-3) is the area that generates magnetic pressure on the bridge region. The inner surface of the via (6) is coated with a conductive material, and the electrical connection between the top pad (5) and the metal layer is achieved through the via (6).

2. The explosive foil chip according to claim 1, characterized in that, The magnetic core (1-2) is made of magnetic powder core, iron-silicon-aluminum core and / or ferrite core.

3. The explosive foil chip according to claim 2, characterized in that, The material of the metal layer (2) is Cu, Au, Ag or Al.

4. The explosive foil chip according to claim 3, characterized in that, The material of the fly sheet layer (3) is polyimide, polychloro-p-xylene or ceramic.

5. The explosive foil chip according to claim 4, characterized in that, The acceleration chamber (4) is made of ceramic or organic materials.

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