US Government As Represented by the Secretary of the Army

USA As Represented by Secretary of the Navy

Daniel Stec, Iii

Neha Mehta

Brian Edward Fuchs

Gartung Cheng

Paritosh R Dave

Kathy Yang

Gerard I Gillen

Emily A Cordaro

Amy Wilson

Paula Cook

Anne Marie Petrock

Thomas G Archibald

Woo Young Lee

Raja G Duddu

Rao C Surapaneni

James L Zunino, Iii

Brian E Travers

Neelam Mehta

Carl Hu

Andrew Perich

Daniel P Schmidt

Gartumg Cheng

Andrew C Ihnen

Ralph L Perez

Robert Lateer

A method of forming a very small, i.e. microliter, finely detailed explosive train for the ignition of energetic munitions&#x2014;which train is formed by ink jetting picoliter volume droplets of an explosive ink onto the substrate; which explosive ink is a pure liquid that will not clog the ink jet printer. The explosive ink being a solution composed of a secondary organic explosive solute, a polymeric binder solute, and a polar aprotic organic solvent. Where the ink jet printer is a commercial piezoelectric type, drop-on-demand, ink jet printer capable of precisely delivering the subject picoliter volume droplets. And, which printer is capable of heating said substrate to an elevated temperature to more rapidly evaporate the solvent, leaving the desired, finely detailed, efficacious, crystalline explosive train.

Ink jet printing and patterning of explosive materials

Secondary crystalline high explosives are disclosed which are suitable for filling very small volume loading holes in micro-electric initiators for micro-electro-mechanical mechanisms (MEMS), used as safe and arm (S&A) devices. The explosives are prepared by adding the such a high explosive to an aqueous first volatile mobile phase, adding such a high explosive to a non-aqueous second volatile mobile phase, mixing the first and second volatile mobile phases and then loading the combined phases into the MEMS device and allowing the aqueous and non-aqueous solvents to evaporate depositing the high explosive. Enhanced adhesion between the deposited high explosive and enhanced rheological properties can be obtained by adding a polymeric binder to both mobile phases.

High explosive fills for MEMS devices

A method of forming a conductive ink bridge wire EED on either a flat or curved substrate, wherein a finely detailed bridge wire EED is printed on the substrate using a nano-particle conductive material applied with a commercially available piezoelectric drop-on-demand ink jet printer&#x2014;which bridge wire is subsequently coated with a first primary explosive layer, an optional second transition explosive layer, and a third secondary explosive layer&#x2014;such that upon creating a current through the bridge wire EED, the bridge wire is heated and the explosive layers detonate in turn, and in turn initiate the detonation of the device to which the detonator is attached.

Flexible detonator integrated with directly written energetics

A method for preparing an insensitive bis(2,2-dinitropropyl)nitramine (BDNPN) as a fine powder which exhibits desirable insensitive munitions (IM) characteristics for use alone or compounded with other energetic materials such as RDX.

Preparation of insensitive bis(2,2,-dinitropropyl) nitramine (BDNPN)

A lead-free primer energetic composition including Cyanuric Triazide (60%), Tetracene (5%), Barium Nitrate (20%) and Antimony Trisulfide (15%) is produced. The lead-free primer energetic composition is used to construct a primary detonator including a transfer charge of Cyanuric Triazide, which produces a further initiation train that may subsequently detonate a secondary explosive, i.e., HDX, RDX, or a pyrotechnic device.

Lead free detonator and composition

High explosives suitable for filling very small volume loading holes in micro-electric initiators for micro-electro-mechanical mechanisms, used as safe and arm devices, are prepared from slurries of crystalline energetic materials including organic liquid and applied using various methods. These methods include swipe loading, pressure loading and syringe loading. The organic liquid serves as a volatile mobile phase in the slurry so as to partially dissolve the energetic material so that, upon evaporation of the mobile phase, the energetic material precipitates and adheres to the loading hole.

High explosive fills for very small volume applications

Methods for making and using high explosive fills for MEMS devices

High explosive coatings and inks suitable for use in micro-electronic initiators for micro-electro-mechanical mechanisms used as safe and arm devices, are prepared from coating compositions of crystalline energetic materials and applied using various methods. These methods include wiping and spraying, as well as, pressure applications using a syringe or the like, and application of thick film ink to write specified patterns on a selected surface. A volatile mobile phase may be added to the coating composition to partially dissolve the energetic material so that, upon evaporation of the mobile phase, the energetic material precipitates and adheres to the selected surface.

Method for producing and using high explosive material

The present invention discloses a process for the on-demand production of small quantities of lead azide. First, a metered quantity of sodium azide solution and a metered quantity of a solution of a lead salt sufficient to react with the sodium azide are introduced into a T-mixer or Y-mixer. Then, the sodium azide and lead salt solutions are conveyed into a static mixer and the azide and lead compounds are permitted to react together, forming insoluble crystals of lead azide as a slurry in an aqueous medium. The lead azide crystals are then separated from the aqueous medium. The process is carried out within an explosion-proof chamber.

On-demand lead azide production

High explosives suitable for filling very small volume loading holes in micro-electric initiators for micro-electro-mechanical mechanisms, used as safe and arm devices, are prepared from slurries of crystalline energetic materials and applied using various methods. These methods include swipe loading, pressure loading and syringe loading. A volatile mobile phase may be added to the slurry so as to partially dissolve the energetic material so that, upon evaporation of the mobile phase, the energetic material precipitates and adheres to the loading hole.

Methods for making and using high explosive fills for very small volume applications

The invention is a composition containing high loadings of TNAZ that are made by crash precipitation with water as the precipitation agent. The compositions are in the form of powders, which can be formed and shaped by presseing, extrusion, etc. The TNAZ can be from about 94 to about 99% by weight of the composition.

TNAZ compositions and articles, processes of preparation, TNAZ solutions and uses thereof

TNAZ can be prepared directly from N-tertiarybutyl-3,3-dinitroazetidine compounds. The compounds may be in the form of the tertiary amine or the quaternary amine. The reaction is in the presence of acetic anhydride and nitrate ions. It gives high yields and uses mild conditions.

Processes for preparing TNAZ

ADNAZ, N-acetyl, 3,3 dinitroazetidine, is a new compound and this invention provides the compound, its compositions, preparation and uses. As a compound, it forms a eutectic with TNAZ. It can be used to prepare other compounds. It can be readily nitrated to remove the acetyl group and form TNAZ.

Growing community of inventors

Long Valley, NJ, United States of America

Daniel Stec, Iii