Study On Performance Of CuO-Al Reactive Multilayer Films Used In Laser-driven Flyer

The mechanism of the reactive multilayer films in laser-driven flyer is focused in this paper and the heat effect of CuO-Al reactive multilayer films with different nanometer scale and the plasma characteristics of laser induce CuO-Al reactive multilayer films and its influence on the velocity of composite flyer. CuO-Al reactive multilayer films and CuO-Al-Al2O3-Al composite films were prepared by magnetron sputtering. Respectively, the composite films were characterized by XRD, SEM. The results showed that the particle sizes of film were increased with the increasing of film thickness, the surface of the films were smooth and the interfaces between different layers were compact.The heat release of CuO-Al reactive multilayer films was characterized by DTA, the results showed that the smaller the nanometer scale of the CuO and Al films, the greater the heat release of the first exothermic peak and the proportion in the total heat release.The velocity of composite flyers were measured by Photonic Doppler Velocimetry, the results showed that the thermite materials of CuO and Al used as ablative layer materials in laser-driven flyer plates could improve the velocity of flyers significantly in certain extent. The velocity of flyers was affected by the heat release of CuO-Al reactive multilayer films, the velocity of flyers would be improved with the increasing of the heat release of CuO-Al films.The velocity and acceleration of the composite flyers would be improved by using the smaller modulation cycle of CuO-Al films as ablation layer materials when the film thickness of ablation layer was constant. There was an optimal thickness of the Al2O3 thermal insulation layer in the composite flyers and a balance should be achieved in the velocity and quality of flyers.The plasma characteristics of laser induced CuO-Al composite films were studied by atomic emission spectroscopy. The result showed that there was an optimal laser energy threshold in plasma electron temperature under certain conditions, the Al2O3 interface layer of CuO-Al composite films has a significant effect on the plasma characteristics of laser induce composite films. Besides, there was a cutoff value of laser pulse energy in the comparision of the plasma electron temperature and density of composite film with different modulation period and irrespective of the delay time.