Electromagnetic radiation absorptive composition containing inorganic coated microparticles
AssigneeSpectro Dynamics Systems, L.P.
InventorsWayne Laval Gindrup, Rebecca Reeves Vinson, Christopher Richard Sutter
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Abstract
A strong lightweight composition containing inorganic coated microparticles which, when dispersed in a binder, produce a matrix having broad band absorption properties for electromagnetic radiation in the infrared and microwave regions and is useful as a thin coating or as a structural composite material in various applications for multispectral absorbers. The microparticles have a mean diameter of from 1 to 500 microns and are coated with the reaction product of a metal and a nonmetal.
Claims21
An electromagnetic radiation absorptive composition which comprises an inorganic particle, essentially insoluble in water, with a size between 1 and 500 microns and with an aspect ratio less than 10 to 1 which may be hollow, porous, or solid, coated with an essentially water insoluble inorganic composition;
- wherein said inorganic coating composition comprises one or more of the compounds formed when one or more of the following metals:
- silver, nickel, copper, iron, palladium, cobalt, chromium, manganese, cadmium, tin, lead, antimony, tungsten, titanium, vanadium, zirconium, aluminum, molybdenum, zinc, or their alloys is reacted with one or more of the following non-metallic elements:
- nitrogen, phosphorus, arsenic, silicon, oxygen, carbon, sulfur, selenium, tellurium, fluorine, chlorine, bromine, iodine, and boron.
An electromagnetic radiation absorptive composition which comprises an electromagnetic radiation non-absorptive binder;
- and a multiplicity of electromagnetic radiation absorptive microparticles dispersed in said binder, said microparticles having a diameter of from 1 to 500 microns and an aspect ratio of less than 10 to 1, said particles coated with an essentially water insoluble inorganic composition;
- wherein said inorganic coating composition comprises one or more of the compounds formed when one or more of the following metals:
- silver, nickel, copper, iron, palladium, cobalt, chromium, manganese, cadmium, tin, lead, antimony, tungsten, titanium, vanadium, zirconium, aluminum, molybdenum, zinc, or their alloys is reacted with one or more of the following non-metallic elements:
- nitrogen, phosphorus, arsenic, silicon, oxygen, carbon, sulfur, selenium, tellurium, fluorine, chlorine, bromine, iodine, and boron;
- said inorganic coating being present on the microparticles at 0.01% to 200% by weight.
A structure which absorbs electromagnetic radiation comprising a substrate and an electromagnetic radiation absorptive coating carried by the substrate, said coating comprising a binder and a multiplicity of inorganic coated microparticles dispersed in and bound by said binder, said microparticles having a diameter of from 1 to 500 microns and an aspect ratio of less than 10 to 1, said particles coated with an essentially water insoluble inorganic composition;
- wherein said inorganic coating composition comprises one or more of the compounds formed when one or more of the following metals:
- silver, nickel, copper, iron, palladium, cobalt, chromium, manganese, cadmium, tin, lead, antimony, tungsten, titanium, vanadium, zirconium, aluminum, molybdenum, zinc, or their alloys is reacted with one or more of the following non-metallic elements:
- nitrogen, phosphorus, arsenic, silicon, oxygen, carbon, sulfur, selenium, tellurium, fluorine, chlorine, bromine, iodine, and boron;
- said inorganic coating being present on the microparticles at 0.01% to 200% by weight.
A structure which absorbs electromagnetic radiation comprising an electrically conductive substrate, a microwave absorbing layer overlying said substrate, and an infrared absorbing layer overlying said microwave absorbing layer, said infrared absorbing layer comprising a binder and a multiplicity of microparticles dispersed in and bound by said binder, said microparticles having a diameter of from 1 to 500 microns and an aspect ratio of less than 10 to 1, said particles coated with an essentially water insoluble inorganic composition;
- wherein said inorganic coating composition comprises one or more of the compounds formed when one or more of the following metals:
- silver, nickel, copper, iron, palladium, cobalt, chromium, manganese, cadmium, tin, lead, antimony, tungsten, titanium, vanadium, zirconium, aluminum, molybdenum, zinc, or their alloys is reacted with one or more of the following non-metallic elements:
- nitrogen, phosphorus, arsenic, silicon, oxygen, carbon, sulfur, selenium, tellurium, fluorine, chlorine, bromine, iodine, and boron;
- said inorganic coating being present on the microparticles at 0.01% to 200% by weight.
Dependencies are inferred from the claim text.