An initiator integrated the AI/MoO3 multilayer nanothermite and bridge-wire electrode plug

Abstract

Abstract Lead styphnate is a primary explosive with low brisance, and is extensively applied into civil and military devices. Whereas the electrostatic sensitivity of LTNR is extremely high, it is disadvantageous for the safety of ignition system. In this paper, a novel initiator was integrated with Al/MoO3 multilayer film and bridge wire by magnetron sputtering. The thickness of Al/MoO3 multilayer was 3um with period of 20nm/30nm. The heat release of Al/MoO3 multilayer film was and 1164J/g, which was characterized by differential scanning calorimetry (DSC). And the combustion speed of film was about 5.3 m/s, it was characterized by high speed cameral and laser ignition system. The firing sensitivities was measured by Langly method, the 50% and 99.9% firing-current sensitivity of initiator was 0.08A and 0.11A, respectively, and the 50% and 99.9% firing-voltage sensitivity of initiator was 2.30V and 2.56V, respectively. The firing sensitivities of Al/MoO3 multilayer film was almost equal to the LTNR. The insensitive ignition composition of B-KNO3 tablet was easily fired with in the gap of 2.12 mm. And the initiator can easily fire the lead azide in detonator. All of these, it is suggested that Al/MoO3 multilayer film will expect to be a substitute for LTNR and improve the ignition ability and safety of ignition system and has a significant influence on the design of explosive devices.