Tungsten bridge for the low energy ignition of explosive and ene

Details Tungsten bridge for the low energy ignition of explosive and ene Tungsten bridge for the low energy ignition of explosive and ene

1988-12-30

1990-12-11

Jordan, Charles T.

Ammunition and explosives

Igniting devices and systems

Electrical primer or ignitor

1022029, F42B 310

Patent

active

049762001

ABSTRACT:
A tungsten bridge device for the low energy ignition of explosive and energetic materials is disclosed. The device is fabricated on a silicon-on-sapphire substrate which has an insulating bridge element defined therein using standard integrated circuit fabrication techniques. Then, a thin layer of tungsten is selectively deposited on the silicon bridge layer using chemical vapor deposition techniques. Finally, conductive lands are deposited on each end of the tungsten bridge layer to form the device. It has been found that this device exhibits substantially shorter ignition times than standard metal bridges and foil igniting devices. In addition, substantially less energy is required to cause ignition of the tungsten bridge device of the present invention than is required for common metal bridges and foil devices used for the same purpose.

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R. Blewer et al., "Thick Tungsten Films In Multilayer Conductor Systems: Properties and Deposition Technique", 1984 Proceedings, First International IEEE VLSI Multilevel Interconnection Conference, New Orleans, LA, Jun. 21-22, 1984, pp. 153-158.
R. Smith et al., "Design of Solid-State Film-Bridge Detonators with Heat Transfer Calculations for Film-Bridge and Hot-Wire Electro-Explosive Devices", NWC TP 6448, Sep. 1983, pp. 1-97.

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