Black powder substitutes for small caliber firearms

C - Chemistry – Metallurgy – 06 – B

Patent

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C06B 31/22 (2006.01) C06B 29/20 (2006.01) F42B 5/00 (2006.01)

Patent

CA 2652642

Propellant compositions are provided herein for use in small arms cartridges. Such propellant compositions include from about 70 to about 90 % by weight of a cellulose-based organic fuel, from about 5 to about 30 % by weight of a non-azide, nitrogen-containing primary organic oxidizer and from about 0.5 to about 10.0 % by weight of a secondary nitrate, perchlorate, chlorate or peroxide oxidizer. Preferably, such compositions are in the form of extruded shaped hollow cylindrical grains having a length in the range of 0.030 to 0.200 inch, a diameter in the range 0.040 to 0.070 inch, and having a coaxial opening there through having a wall grain thickness in the range 0.008 to 0.016 inch. Ignition grains are also provided for use alone or in a mixture with the propellant compositions. When used in a small caliber firearm or muzzleloader, the temperature of combustion is at a level that ensures substantially complete combustion of the fuel during firing so that the products of combustion are mostly gaseous.

L'invention concerne des compositions de propergol destinées à une utilisation dans des armes à feu de petit calibre. De telles composition de propergol comprennent d'environ 70 à environ 90 % en poids d'un combustible organique à base de cellulose, d'environ 5 à environ 30 % en poids d'un oxydant organique primaire non azide contenant de l'azote, et d'environ 0,5 à environ 10,0 % en poids d'un second oxydant nitrate, perchlorate, chlorate ou peroxyde. De telles compositions sont de préférence sous forme de grains cylindriques creux extrudés mis en forme dont la longueur est comprise entre 0,030 et 0,200 pouce, un diamètre compris entre 0,040 et 0,070 pouce dont l'ouverture coaxiale avec une épaisseur de paroi est comprise entre 0,008 et 0,016 pouce. L'invention concerne également des grains d'allumage destinés à être utilisés seuls ou en mélange avec les compositions de propergol. Lors d'une utilisation dans une arme à feu de petit calibre ou à chargement par la bouche, la température de combustion est à un niveau qui assure une combustion sensiblement totale du combustible durant le tir, les produits de combustion étant ainsi principalement gazeux.

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