Abstract
The laser-driven flyer plate is an important loading technology in high energy physics, shock wave physics, and explosive initiation application. How to generate a high-velocity and intact flyer plate by using the laser is a matter of concern for laser driving. In this study, the multilayer flyer plates (MFPs) of Al/Al2O3/Al and TiO2/Al/Al2O3/Al with adjustable performance were designed and fabricated by magnetron sputtering and analyzed by scanning electron microscopy (SEM), laser reflectance spectrometer, and differential thermal analysis (DTA). The effects of the structure and material on the output performance of MFPs were analyzed by photon Doppler velocimetry (PDV) and ultrahigh-speed video. The morphology results showed that the structure of MFPs had uniform and clear boundaries between side-by-side layers. The MFP velocity was controlled in the range of 4.0–6.0 km/s by adjusting the film thickness, structure, and thermite material with 43.1 J/cm2 laser ablation. Among them, the energetic flyers with the thermite ablation layer had the highest final velocity of 5.38 km/s due to the prestored energy of TiO2/Al. By appropriately increasing the thickness of Al2O3 from 0.4 μm to 0.8 μm, the complete flight of the flyer plate to 3.72 mm can be realized. In addition, TiO2/Al thermite film had characteristics of reaction heat release and lower laser reflectivity (72.13%) than the Al layer (80.55%), which explained the velocity enhancement effect of energetic flyer plates. This work provides facile strategy to enhance the output performance of MFPs, which may facilitate the practical applications of laser driving technology.
Highlights
In order to realize the miniaturization and engineering application of the laserdriven flyer plate impact initiation, many researchers have carried out a wealth of research from the aspects of optical fiber transmission of pulsed laser energy, preparation of high-efficiency flyer plates, and refinement of detonating agents [8–15]
The scanning electron microscopy (SEM) image of the energetic flyer plates TiO2/Al/Al2O3/Al (III) with 0.2 μm TiO2, 0.2 μm Al, 0.4 μm Al2O3, and 2.6 μm Al showed good compactness and clearly layered structure. e SEM analysis results showed that the internal structure and composition of the multilayer flyer plates (MFPs) were the same as expected, indicating that the samples we prepared can be used as energy conversion microdevices with adjusted performance
Nonenergetic Al/Al2O3/Al and energetic TiO2/ Al/Al2O3/Al MFPs were prepared by magnetron sputtering, and the films were uniform and compact without defects
Summary
Laser-driven flyer plate is an important dynamic highpressure loading method, the main principle of which is the utilization of a high-power pulse laser to ablate film to form plasma. Wu et al used the thermite film as the ablative layer structure of the MFPs and increased the flyer velocity by about 10% [19, 20]. The energetic flyer plates were prepared with different thermite-ablative layers [21, 22], and the flyer plates with excellent performance were obtained, but the effects of thicknesses and structures on the performance of flyer plates were explored less, especially compared with the nonenergetic flyer plate. E characteristics of flyers with different film structures and thicknesses were evaluated by observing and analyzing the fragmentation and decomposition (through the increase process of the flyer velocity and the change process of the flyer morphology) under the action of plasma erosion, which has not been paid much attention in previous studies on laser-driven flyers. By adjusting the thickness of each layer of the flyer film, the influence of the film layer on the performance of the flyer was obtained, which provided a design scheme for the laser flyer plate. e acceleration process and mechanism of MFPs with different structures driven by using the laser were analyzed in depth, so as to provide support for the design and application of MFPs with high output performance
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