Preparation And Electro-explosive Performance Of Al/Fe₂O₃ Energetic Semiconductor Bridege

There is very broad application in the field of weapon system and aerospace launch engineering of initing explosive device.And it plays an important role in taking off the ignition and star arrow separation.We can say that the safty and ignition reliability of initing explosive device decides the safty and ignition reliability of the whole system.In this study three-dimensional ordered macroporous（3DOM）Al/Fe₂O₃ energetic film have been prepared by depositing aluminum with magnetron sputtering in the skeleton thin film based on the colloidal crystal template methods.The skeleton thin film and Al/Fe₂O₃ energetic film were characterized by SEM、TEM、EDS、XRD and nitrogen adsorption-desorption test,the results show that the film presents 3DOM structure,which increase the contact area between nano-Al and Fe₂O₃ skeleton up to 43.98 m²·g^-1.The molar ratio of Al and Fe₂O₃ is 0.45 for the Al/Fe₂O₃ energetic film,the DSC curve has two exothermic peak at 580.37℃ and 772.65℃ respectively,and the total heat release is 1444.41 J/g.Furthermore,3DOM-Al/Fe₂O₃-energetic semiconductor bridge（ESCB）was fabricated by integrating the 3DOM-Al/Fe₂O₃ energetic film into polysilicon semiconductor bridge（SCB）using the methods of distribution droplets.The ignition process of Al/Fe₂O₃-ESCB is similar to polysilicon SCB in the experiment of Electro-explosive performance.There are the stages of heating,melting,ionization and plasma heating,as well as the thermite reaction between Al and Fe₂O₃.The ignition time of Al/Fe₂O₃-ESCB decreases with the increase of voltage,however,the critical ignition energy has little change.The spark height,area and duration of Al/Fe₂O₃-ESCB are more than those of polysilicon SCB from the image collected by high-speed camera,demonstrated the ignition ability of Al/Fe₂O₃-ESCB is higher than the polysilicon SCB.