Performance Of Al/CuO Energetic Bridge And Its Application In B/KNO₃ Insensitive Tablets

In this paper,eight different types of Al/CuO energetic bridges were prepared by magnetron sputtering,and the safety performance experiments of Al/CuO energetic bridges were carried out.The ignition behavior of Al/CuO energetic bridges and the effect of excitation on the Al/CuO energetic bridges under different capacitances and voltages were also studied.ANSYS finite element analysis software was used to simulate the temperature distribution of Al/CuO energetic bridges under the conditions of capacitance and constant current excitation respectively.Finally,the ignition ability of B/KNO₃ insensitive ignition powders ignited by different physical states of Al/CuO energetic bridges was studied experimentally,and the Al/CuO energetic bridges and B/KNO₃ insensitive ignition were exposed to air gap and isolation respectively Ignition ability.Mainly get the following result:1)The experimental results of 1A1W5min non-igniting experiment on 8 kinds of Al/CuO energetic bridges show that the 0.6×1.7 type energetic bridges conforms to1A1W5min constant-current safety experiment standard,and 500PF,5000?,25KV electrostatic safety.The experiment results show that the 0.6×1.7 type energetic bridges complies with the experimental standards of electrostatic safety without any significant change in resistance before and after the experiment,Subsequent experimental selected 0.6×1.7 type energetic bridge.2)When the Al/CuO energetic bridges was excited by different capacitances,the energy utilization efficiency of 47?F capacitor was higher when the energetic bridges was excited by capacitive discharge.Therefore,47?F capacitor was chosen for subsequent experiments.The available energy of Al/CuO energetic bridges at 60V voltage excitation is 20.805mJ under the excitation voltage of 47?F;the available energy of Al/CuO energetic bridges at 35V is 4.44mJ;the available energy of Al/CuO energetic bridges at 15V is 2.517mJ.3)NSYS software was used to simulate the temperature distribution of Al/CuO energetic bridges with temperature of 60V,35V and 15V with 47?F capacitor.At 60V,the temperature of the energetic bridge head can reach 3197.3?,the reaction zone can reach 540?.At this time,the temperature in the lowest part of the reaction zone reached 550?,and the reaction of CuO film with energetic bridge was completed.When the temperature was 35V,the highest temperature of the bridge can reach953.59?and the lowest in the reaction zone reaches 173?,so some CuO films react with Al thin film in the reaction zone of energetic bridge.At 15V,the reaction temperature of the energetic bridges was only 688?,and the initial reaction temperature of Al and CuO reached about 550?.At the same time,the reaction temperature of Al was almost reached to the melting point of Al thin film?660??,Therefore,the energetic bridge was destroyed.,and the three simulation results are consistent with after the experimental bridges.The temperature distribution of Al/CuO energetic bridges at different time points under the constant current power supply excitation was also simulated by ANSYS software.The temperature rise of the energetic bridge in 0.1s under constant current excitation continued to increase and the temperature was kept constant at 173?after 0.1s,and the energetic bridge head and the reaction zone temperature is not much difference.4)The B/KNO₃ insensitive igniter with different physical states ignited by Al/CuO energetic bridge is studied.The minimum ignition voltage is 87V when the Al/CuO energetic bridge ignites the fluffy state of the B/KNO₃ ignition powder.,and the minimum ignition voltage of B/KNO₃ powder ignited by Al/CuO energetic bridge has nothing to do with the mass of B/KNO₃ powder.The minimum ignition voltage of B/KNO₃ tablets ignited about 40mg was about 120V,the minimum ignition voltage of about 90mg B/KNO₃ tablets was about 143V,and the minimum ignition voltage of Al/CuO energetic bridges was increased with the increase of B/KNO₃ tablets.5)When the gap distance is more than 0.55mm under the gap ignition conditions,the Al/CuO energetic bridges can not ignite the ignited B/KNO₃ tablets even if the ignition voltage of Al/CuO energetic bridges can increase.