Metal flyer transduction element for slapper detonator

Abstract

The utility model belongs to the technical field of initiating explosive devices, and discloses a metal flyer transduction element for a slapper detonator, which comprises a substrate (1), an adhesion layer (2), a bridge foil (3), an insulating layer (4), a metal flyer (5), an acceleration chamber (6), an electrode I (7) and an electrode II (8), the adhesion layer (2) is attached to the substrate (1) in a magnetron sputtering manner; the bridge foil (3) is attached to the adhesion layer (2) in an electroplating or magnetron sputtering mode and is in a bridge shape. The first electrode (7) and the second electrode (8) are made of the same material as the bridge foil (3) and are arranged at the two ends of the bridge shape of the bridge foil (3); the metal flyer (5) is attached to the insulating layer (4) in an electroplating or magnetron sputtering manner and is circular; and the accelerating chamber (6) is arranged on the outer surface of the metal flyer (5). According to the utility model, excessive loading and neglected loading of flyers and entry of foreign matters in the transduction element assembly process are effectively avoided, and the production quality control of the transduction element is improved.

Description

Technical Field

[0001] This utility model belongs to the field of pyrotechnics technology, and in particular relates to a metal flyer energy transducer for impact detonators. Background Technology

[0002] Impact detonators, also known as Exploding Foil Initiators (EFI), use high explosives as their output charge and offer advantages such as resistance to mechanical shock, static electricity, electromagnetic interference, and radio frequency. The transducer used in impact detonators typically consists of a substrate, bridge foil, flyer foil, accelerating chamber, and electrodes. Its main function is to convert electrical energy into kinetic energy. The process involves an external pulsed high-voltage current acting on both ends of the bridge foil through the electrodes. The bridge foil instantly vaporizes and explodes, forming a high-temperature, high-pressure plasma. This plasma is then sheared by the flyer foil within the accelerating chamber, where it is further accelerated.

[0003] The conventional transducer used in impact detonators uses a polyimide film (PI film) as its flyer material, a high-temperature resistant insulating material. The PI film used as the flyer is only tens of micrometers thick. Due to its small size and light weight, it is difficult to handle during transducer assembly, making assembly challenging. The PI film is semi-transparent and pale yellow, similar in color to the bridge foil. When two flyers are stacked together or a flyer is missing, identification is difficult, easily leading to over-installation or under-installation of flyers (only one flyer is allowed per transducer), causing the detonator to misfire. The PI film is prone to static electricity, easily attracting dust, fibers, and other foreign matter during flyer manufacturing and assembly, making it difficult to clean. If foreign matter accidentally enters the transducer, it will severely affect the detonator's ignition sensitivity. These disadvantages of the PI film seriously affect the assembly efficiency and production quality control of the transducer. Utility Model Content

[0004] The technical problem this invention aims to solve is the high assembly difficulty and difficulty in controlling the production quality of conventional transducers using PI film flyers.

[0005] To solve the above-mentioned technical problems, the specific technical solution of this utility model is as follows:

[0006] A metal flyer transducer for an impact detonator includes a substrate 1, an adhesive layer 2, a bridge foil 3, an insulating layer 4, a metal flyer 5, an accelerating chamber 6, an electrode 1 7, and an electrode 2 8.

[0007] The adhesion layer 2 is attached to the substrate 1 by magnetron sputtering; the bridge foil 3 is attached to the adhesion layer 2 by electroplating or magnetron sputtering and is in the shape of a bridge; the materials of electrode 1 7 and electrode 2 8 are the same as those of the bridge foil 3 and are disposed at both ends of the bridge shape of the bridge foil 3; the metal flyer 5 is attached to the insulating layer 4 by electroplating or magnetron sputtering and is in the shape of a circle; the acceleration chamber 6 is disposed on the outer surface of the metal flyer 5.

[0008] Preferably, the substrate is made of smooth glass or smooth alumina ceramic, with a thickness of 1 mm to 2 mm.

[0009] Preferably, the adhesive layer material is titanium, chromium, or nickel.

[0010] Preferably, the bridge foil material is copper, gold, silver or aluminum.

[0011] Preferably, the insulating layer material is silicon nitride, magnesium oxide, or aluminum oxide, with an adhesion thickness of 1 μm to 2 μm.

[0012] Preferably, the metal flyer material is aluminum, and the thickness is 10μm to 15μm.

[0013] Preferably, the metal flyer material is titanium, and the thickness is 8μm to 10μm.

[0014] Preferably, the metal flyer material is copper, and the thickness is 3μm to 5μm.

[0015] Preferably, the metal flyer material is a nickel-chromium alloy with a thickness of 3μm to 5μm.

[0016] Furthermore, an external pulsed high-voltage current acts on both ends of the bridge foil 3 through electrode 7 and electrode 8. The bridge foil 3 instantly vaporizes and explodes to form a high-temperature and high-pressure plasma, which cuts off the flying piece 5 through the acceleration chamber 6 and completes the acceleration process of the flying piece 5 within the acceleration chamber 6.

[0017] This utility model has the following advantages:

[0018] (i) The metal flyer was fabricated using MEMS technology, which enabled the integrated design of the substrate, bridge foil and flyer, and simplified the assembly process of the transducer.

[0019] (ii) It effectively avoids the over-installation, under-installation, and foreign object entry of fly-through plates during the assembly of transducers, thereby improving the production quality control of transducers. Attached Figure Description

[0020] Figure 1 This is a front cross-sectional view of the transducer.

[0021] Figure 2 This is a top-view schematic diagram of the overall structure of the transducer.

[0022] Figure 3 This is a schematic diagram of the bridge foil shape of the transducer. Detailed Implementation

[0023] To better understand the purpose, structure, and function of this utility model, a more detailed description of this utility model is provided below with reference to the accompanying drawings.

[0024] like Figure 1 and Figure 2 As shown, the transducer for the impact detonator in this embodiment consists of a substrate 1, an adhesive layer 2, a bridge foil 3, an insulating layer 4, a flyer 5, an accelerating chamber 6, an electrode 1 7, and an electrode 2 8. The substrate 1 is made of smooth glass or smooth alumina ceramic, with a thickness of 1mm to 2mm. The adhesive layer 2 strengthens the adhesion between the bridge foil 3 and the substrate 1. Its material is generally titanium, chromium, nickel, etc., and it is attached to the substrate 1 by magnetron sputtering. The bridge foil 3 is attached to the adhesive layer 2 by electroplating or magnetron sputtering. Its preferred material is copper, but it can also be gold, silver, or aluminum. It is then fabricated through processes such as top dressing, masking, and etching, and is bridge-shaped, as shown in the image. Figure 3 Electrode 7 and electrode 8 are made of the same materials as bridge foil 3, and their fabrication is completed simultaneously with that of bridge foil 3. The insulating layer 4 serves to block the current path between bridge foil 3 and flyer plate 5, preventing transducer misfire. Its materials are generally silicon nitride, magnesium oxide, or aluminum oxide, with an adhesion thickness of 1μm to 2μm. It is fabricated through processes such as spin coating, masking, development, magnetron sputtering, and etching. Flyer plate 5 is attached to the insulating layer 4 by electroplating or magnetron sputtering. Its materials include aluminum, titanium, copper, and nickel-chromium alloys, with corresponding flyer plate thicknesses of 10μm to 15μm, 8μm to 10μm, 3μm to 5μm, and 3μm to 5μm, respectively. It is then fabricated through processes such as spin coating, masking, and etching, and is circular in shape. The accelerating chamber 6 is made of zirconia ceramic and is fabricated using laser cutting.

[0025] Working principle: An external pulsed high-voltage current acts on both ends of the bridge foil 3 through electrode 1 7 and electrode 2 8. The bridge foil 3 instantly vaporizes and explodes to form a high-temperature and high-pressure plasma, which cuts off the flying piece 5 through the acceleration chamber 6 and completes the acceleration process of the flying piece 5 in the acceleration chamber 6.

[0026] The transducer manufactured according to the above embodiments has been applied to the impact detonator of a certain type of guided bomb, and can be further extended to other models with high requirements for ignition reliability. This utility model has a simple structure, high integration, and wide applicability.

[0027] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and improvements without departing from the principles of the present invention, and these modifications and improvements should also be considered to fall within the protection scope of the present invention.

Claims

1. A metal flyer transducer for an impact detonator, characterized in that, It includes a substrate (1), an adhesive layer (2), a bridge foil (3), an insulating layer (4), a metal fly sheet (5), an acceleration chamber (6), an electrode one (7), and an electrode two (8); The adhesion layer (2) is attached to the substrate (1) by magnetron sputtering; the bridge foil (3) is attached to the adhesion layer (2) by electroplating or magnetron sputtering and is in the shape of a bridge; the materials of electrode one (7) and electrode two (8) are the same as those of the bridge foil (3) and are located at both ends of the bridge shape of the bridge foil (3); the metal flyer (5) is attached to the insulating layer (4) by electroplating or magnetron sputtering and is in the shape of a circle; the acceleration chamber (6) is located on the outer surface of the metal flyer (5).

2. The metal flyer transducer for an impact detonator according to claim 1, characterized in that, The substrate is made of smooth glass or smooth alumina ceramic, with a thickness of 1mm to 2mm.

3. The metal flyer transducer for an impact detonator according to claim 1, characterized in that, The adhesive layer material is titanium, chromium, or nickel.

4. The metal flyer transducer for an impact detonator according to claim 1, characterized in that, The bridge foil material is copper, gold, silver or aluminum.

5. The metal flyer transducer for an impact detonator according to claim 1, characterized in that, The insulating layer material is silicon nitride, magnesium oxide, or aluminum oxide, with an adhesion thickness of 1μm to 2μm.

6. The metal flyer transducer for an impact detonator according to claim 1, characterized in that, The metal flyer is made of aluminum and has a thickness of 10μm to 15μm.

7. The metal flyer transducer for an impact detonator according to claim 1, characterized in that, The metal flyer is made of titanium and has a thickness of 8μm to 10μm.

8. The metal flyer transducer for an impact detonator according to claim 1, characterized in that, The metal flyer is made of copper and has a thickness of 3μm to 5μm.

9. The metal flyer transducer for an impact detonator according to claim 1, characterized in that, The metal flyer is made of nickel-chromium alloy and has a thickness of 3μm to 5μm.

10. The metal flyer transducer for an impact detonator according to claim 2, characterized in that, An external pulsed high-voltage current acts on both ends of the bridge foil (3) through electrode one (7) and electrode two (8). The bridge foil (3) instantly vaporizes and explodes to form a high-temperature and high-pressure plasma. The plasma is cut off by the acceleration chamber (6) and the acceleration process of the metal flyer (5) is completed in the acceleration chamber (6).

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