Pyrotechnic materials
AssigneeThe Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
InventorFrederick G. Allford
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Abstract
A pyrotechnic material consists of an oxidizable metal vapor-deposited onto a substrate film of an oxidizing polymeric material the metal and polymeric substrate being conjointly capable of exothermic reaction on ignition. The substrate may be provided in flexible film tape form and coated on both sides with metal to provide a flash transfer medium with flash velocities typically within the range 10-100 ms.sup.-1. The substrate is preferably PTFE and the metal magnesium.
Claims17
A pyrotechnic material comprising a substrate film of an oxidizing halogenated polymeric material and at least one layer 2 to 100 microns thick of an oxidizable metallic material vapor deposited onto the surface of the polymeric material in at least one location, wherein the polymeric and metallic materials are conjointly capable of reacting together exothermically on ignition, the thickness and composition of the metallic material being such as to ensure reliable and consistent lateral progression of the exothermic reaction.
A propellant charge incorporating a pyrotechnic material comprising a substrate film of an oxidizing halogenated polymeric material and at least one layer 2 to 100 microns thick of an oxidizable metallic material vapor deposited onto the surface of the polymeric material in at least one location, wherein the polymeric and metallic materials are conjointly capable of reacting together exothermically on ignition, the thickness and composition of the metallic material being such as to ensure reliable and consistent lateral progression of the exothermic reaction, wherein the pyrotechnic material is wound into a cylindrical roll configuration.
A flash transfer medium incorporating at least one longitudinal strip of pyrotechnic material comprising a substrate film of an oxidizing halogenated polymeric material and at least one layer 2 to 100 microns thick of an oxidizable metallic material vapor deposited onto the surface of the polymeric material in at least one location, wherein the polymeric and metallic materials are conjointly capable of reacting together exothermically on ignition, the thickness and composition of the metallic material being such as to ensure reliable and consistent lateral progression of the exothermic reaction, wherein the pyrotechnic material is enclosed within a protective sleeve.
An electrical capacitor incorporating pyrotechnic material comprising a substrate film of an oxidizing halogenated polymeric material and at least one layer 2 to 100 microns thick of an oxidizable metallic material vapor deposited onto the surface of the polymeric material in at least one location, wherein the polymeric and metallic materials are conjointly capable of reacting together exothermically on ignition, the thickness and composition of the metallic material being such as to ensure reliable and consistent lateral progression of the exothermic reaction, wherein the pyrotechnic material is configured such that a plurality of layers of metal are interleaved with a plurality of layers of insulating film.
Dependencies are inferred from the claim text.