High Insensitive Energetic Ignition Device Based On Al/CuO Thin Film

Due to the limitations of the mass and excitation energy of the semiconductor bridge（SCB）,the ignition may be unreliable when the insensitive agent ignites or there is an air gap between the agent and the bridge.With the increasingly harsh modern electromagnetic battlefield,the safety and reliability of common ignition devices gradually decline.In this paper,based on the mature SCB ignition technology,by integrating Al/Cu O energetic film and NTC thermistor,a novel energetic ignition device is designed and fabricated,which has better ignition performance and safety performance.Its safety performance and electrodetonation energy exchange characteristics are studied,and its ignition performance and influence rule are revealed.The main research contents and conclusions are as follows:（1）Based on SCB,an energetic semiconductor bridge（ESCB）ignition chip was prepared by integrating Al/Cu O energetic composite films onto SCBS by magnetron sputtering technology.By SEM,AFM and other characterization methods,the surface of the prepared energetic composite films is flat without defects,the layered structure is clear,and the connection between layers is close.（2）By integrating NTC thermistor,the energetic ignition device can meet the high insensitive requirement of 2A4W5min non-ignition.The shunt condition of NTC thermistor and ESCB formed in parallel circuit under the conditions of 1.0A,1.5A and 2.0A is studied,and infrared microthermometry test is carried out.The results show that the average shunt ratio of NTC thermistor is 43%,65%and 73%,respectively,at the experimental conditions of1A1W5min,1.5A2.25W5min and 2A4W5min,and the equilibrium temperature is about 124℃,167℃and 192℃.The parallel thermistor can reduce the temperature of the bridge area with energetic ignition devices by 68%～78%,and the maximum temperature of the bridge area is lower than that of the bridge area without NTC thermistor protection by 900℃.The ignition device with NTC thermistor in parallel can prevent RF and static,and meet the requirements of2A4W5min high insensitive and non-ignition.（3）The electrodetonation characteristics of energetic ignition devices were studied by means of capacitor discharge excitation,and the law of electrodetonation energy exchange was studied by combining with high-speed photography,and the finite element simulation was carried out by COMSOL software.The results show that the burst time of the ignition device decreases with the increase of voltage,and the burst energy is less affected by the capacitance voltage,which is related to the properties of the energetic bridge itself.47μF capacitance is selected as the excitation source of the energetic ignition device,and the energy utilization rate is the best.Due to the slow input energy rate and the shunt of NTC thermistor,the explosion time and energy of energetic ignition devices are improved to a certain degree.After 2A5min constant current action,the explosion time,explosion energy and total energy decrease slightly.However,NTC thermistor does not affect the law of electric detonation performance with voltage change under constant capacitance condition.There was no significant effect.The integrated NTC thermistor will not affect the output energy of the energetic ignition device.The higher the excitation energy,the larger the space size and the longer the duration of the plasma,which can improve its ignition ability and have the gap ignition ability.By simulating the temperature distribution of the ignition device,it is found that the point heating rate at the V-shaped corner tip increases nonlinearly with the approach of the tip.After 2A5min constant current excitation,the surface temperature of the bridge area of the whole ignition device is478K,which does not reach the chemical reaction temperature of energetic film,which is consistent with the experimental results and meets the requirement of high insensitive of2A4W5min.（4）The ignition performance experiment shows that:when the ignition gap is 1.2mm,the energetic ignition device can ignite the dull ignition charge boron potassium nitrate（B/KNO₃）,and the 50%ignition sensitivity is 44.04V,and the full ignition voltage is 61.65V.The energetic ignition device has the application standard under the complex environment of 71℃at high temperature,-55℃at low temperature and 25℃at normal temperature.