Abstract
In order to enhance the ignition ability and reliability of traditional electronic initiators, a novel electronic initiator has been designed to integrate with a nanothermite multilayer film and an electrode plug. The Al/CuOx nanothermite multilayer film with different thickness is deposited on the surface of the electrode plug by magnetron sputtering which uses Pt–W wire as electronic resistance. The exothermicity of Al/CuOx nanothermite multilayer film is so favourable that the ignition ability of electronic initiator is significantly improved. The full firing-voltage sensitivity of the electronic initiator is 10.8 V. The thickness of Al/CuOx multilayer film has negligible effects on the ignition time and ignition energy, but leads to great impacts on the function time, the maximum length of combustion flame and ignition ability. The electrical ignition experiments have exhibited outstanding ignition ability, since the electronic initiator can easily fire the insensitive ignition composition of boron-potassium nitrate (B-KNO3) tablet in a gap of 20.35 mm. It proves that this novel proposal of remoulding the traditional electronic ignition devices will distinctly improve the ignition ability and reliability of electronic initiator.
Highlights
Bridge wire is normally used in traditional electronic initiators to initiate the subsequent energy materials [1]
Because the ignition ability of semiconductor bridge (SCB) is heavily dependent on the stimulation energy with microseconds of reaction, it may not be sufficient to provide a reliable ignition if there is a gap between SCB and primary contact energetic material
SEM was used to observe the cross-section of the multilayered Al/CuOx film
Summary
Bridge wire is normally used in traditional electronic initiators to initiate the subsequent energy materials [1]. The SCB has been usually taken as an initiator in military, civil and aerospace fields, since it is of better instantaneity, higher safety and lower firing energy than those of conventional bridge wires [9,10]. If the electronic initiator is constituted by the integration of the bridge wire electrode plug and a multilayered nanothermite film, will its ignition ability be improved, and its reliability will be promoted. A multilayer thermite film of Al/CuOx has been integrated with bridge wire electronic initiator as a novel initiator. The multilayered thermite film of Al/CuOx was deposited in different thickness on the surface of the electrode plug, where Pt–W wire was used as resistance by magnetron sputtering. The ignition performances and firing-voltage sensitivity of the electronic initiator, and the effect of its thickness on the ignition ability have been characterized and are discussed in detail
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