Investigation On Ignition And Initiation Techniques Of Al/MoO₃ Energetic Semiconductor Bridge

In order to resolve the problem that the output energy of conventional SCB is relatively low, the energetic semiconductor bridge (SCB-Al/MoO3) were designed and prepared by integrating Al/MoO3 energetic nanofilms with SCB. In this paper, the electro-explosive plasma temperature and output pressure of SCB-Al/MoO3 were investigated. Based on this, the ignition and initiation performance of SCB-Al/MoO3 were also investigated. The particular research contents and conclusions are as follows:(1) Influence of Al/MoO3 energetic nanofilms on electro-explosive plasma temperature of SCB-Al/MoO3 was obtained with a systematic temperature measurement based on the "double-line atomic emission spectroscopy". Output pressure performance of SCB-Al/MoO3 was obtained with mini closed bomb vessel. Results show that the electro-explosive plasma temperature and output pressure are enhanced dramatically when discharging voltage is over 40V(47μF).(2) The initiation characterization of SCB-Al/MoO3 was operated with HMX-Al/MoO3 composite explosives. It was made of stoichiometric Al/MoO3 nanopowders and nano-HMX, and its sensitivity could be adjusted by varying the mass fraction of nano-HMX. For SCB-Al/MoO3 and SCB, the energy matching relationship and ignition mechanism on HMX-Al/MoO3 were comparative studied through three ignition models of contact, non-contact, and ink-jet printing charge, respectively. Results show that the non-contact initiation performance of SCB-Al/MoO3 is obviously superior to that of SCB, and the plasma impact and penetration effect of SCB-Al/MoO3 can reduce the ignition delay of HMX-Al/MoO3.(3) In order to study the initiation performance of SCB-Al/MoO3, the initiation device was presented based on nano porous copper azide integrated with titanium flyer. Photonic doppler velocity measurement instrument (PDV) were performed to measure the flyer velocity which was driven by nano porous copper azide explosion. Results show that nano porous copper azide can be initiated even the gap is 0.5mm, and the flyer is also sheared and driven to 1534m/s.