Research On Preparation,Characterization And Performance Of Al/Bi₂O₃ Composite Energetic Bridge Film Based On Graphene Oxide

Al/Bi₂O₃ is a kind of metastable intermolecular composites with high gas production and high heat output,but its high sensitivity limits its practical application.Graphene oxide（GO）is a type of energetic nano materials with carbon structure.Compounding Al/Bi₂O₃ with GO can reduce the sensitivity of Al/Bi₂O₃ and effectively control its combustion performance without reducing its heat output.The electrostatic self-assemble method was adopt to synthesize Al/Bi₂O₃/GO nano energetic composites（nECs）with different GO contents.XRD spectra and TEM images showed that the prepared Al/Bi₂O₃/GO nECs has good crystallinity and structural stability.The electrostatic discharge sensitivity studies showed that the addition of GO can significantly reduce the electrostatic sensitivity of Al/Bi₂O₃.Lithography and magnetron sputtering methods were utilized to prepare the Cu micro ignition bridge.Then,Al/Bi₂O₃/GO nECs with different GO contents were deposited onto the bridge area by electrophoretic deposition（EPD）to form composite energetic brigde films（CEBF）.The results showed that EPD is a successful method to prepare Al/Bi₂O₃/GO EIBF,but the membrane effect decreased with the increase of GO contents.Also,the total heat releases of these CEBF rose due to the GO addition,especially when the GO content is 5 wt.%,the heat release reached the highest point at 1210 J/g.The combustion and ignition performance of the CEBF were studied by laser ignition and electrical explosion tests.Laser ignition tests showed that GO can inhibit the combustion of Al/Bi₂O₃ CEBF.The electrical explosion tests illustrated that the addition of GO can reduce the duration of electric explosion for Al/Bi₂O₃ CEBF and increase its the delay time.The volt-ampere characteristic curves of electrical explosion showd that the Cu vapor ionization of Al/Bi₂O₃/GO CEBF occured in advance and atomic double spectral measurement results showed that the Al/Bi₂O₃/GO CEBF with 2 wt.%GO content had a peak temperature up to 3507 K,which was about 400 K higher than that of Al/Bi₂O₃ CEBF,while it had the longest duration of high temperature.These excellent properties prompt Al/Bi₂O₃/GO CEBF with 2 wt.%GO content to own the ability of continuous ignition and to improve the reliability of the micro ignition bridge.