KR920007792A - Electromagnetic radiation absorbing material using particles of two-layer structure - Google Patents

Abstract

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Description

Electromagnetic radiation absorbing material using particles of two-layer structure

As this is a public information case, the full text was not included.

1 is a cross sectional view of a first embodiment of the present invention.

2 is a graph showing the reflection amount calculation of radiation normally incident on the surface of two embodiments of the present invention as a function of the incident radiation frequency.

Claims (30)

(a) central particles; (b) a dispersion layer located on the surface of the central particle and made of inorganic paper; And (c) a plurality of dispersed particles including an insulating layer covering the dispersed layer and a dielectric binder in which the dispersed particles are dispersed. The absorbent material of claim 1 wherein said central particle is selected from the group consisting of microspheres, microbubbles, fibers and flakes. The absorbent material of claim 2, wherein the central particle is a glass microbubble having an average outer diameter of 10 to 500 microns. 4. The absorbent material of claim 3, wherein the central particle is a glass microbubble having an average outer diameter of 20 to 80 microns. 2. The absorbent material of Claim 1 wherein said inorganic material of said dispersion layer is selected from the group consisting of metals and semiconductors. The absorbent material according to claim 5, wherein the inorganic material of the dispersion layer is selected from the group consisting of tungsten, chromium, aluminum, copper, titanium, titanium nitride, molybdenum disulfide, iron, iron suboxide, zirconium, and stainless steel. The absorbent material of claim 1, wherein the dispersion layer has a thickness of 0.05 to 10 nm. The absorbent material of claim 1, wherein the dispersion layer has an average thickness of about 0.4 to 2 nm. The absorbent material as set forth in claim 1, wherein said dispersing layer covers adjacent central particles. The absorbent material of claim 1, wherein the dispersion layer continuously covers the central particles. The absorbent material of claim 1, wherein the dispersion layer has a uniform thickness within 10%. The absorbent material of claim 1, wherein the insulating layer comprises a material selected from the group consisting of aluminum suboxide, silicon dioxide, zirconium oxide, and titanium dioxide. The absorbent material of claim 1, wherein the insulating layer has a thickness of about 2 nm. The absorbent material of claim 1, wherein the insulating layer is adjacent to cover the dispersion layer. The absorbent material of claim 1, wherein the insulating layer continuously covers the dispersion layer. The absorbent material of claim 1, wherein the insulating layer comprises a reaction product of an inorganic material in the dispersion layer. The absorbent material of claim 1, wherein the dielectric binder is ceramic. The absorbent material of claim 1 wherein said dielectric binder is a polymer. 19. The absorbent material of claim 18, wherein said polymeric binder comprises a polymer selected from polyethylene, polypropylene, polymethylmethacrylate, urethane, cellulose acetate, and polytetrafluoroethylene. 19. The absorbent material of claim 18, wherein said polymeric binder comprises a polymer selected from the group consisting of a thermosetting polymeric adhesive and a thermoplastic polymeric bonding adhesive. 19. The absorbent material of claim 18, wherein said polymeric binder comprises a polymer selected from the group consisting of a heat shrinkable polymer, a solvent shrinkable polymer, and a mechanical stretchable polymer. The absorbent material of claim 1, wherein the dielectric binder is an elastomer. The absorbent material of claim 1, wherein the plurality of dispersed particles are dispersed in the dielectric binder at a volume load of 65 to 15%. The absorbent material of claim 1, wherein the central particle is a glass microbubble, and the plurality of dispersed particles are dispersed in the dielectric binder at a volume load of 60 to 30%. A composite comprising the absorbent material of claim 1 and an adjacent conductive material directly bonded to the absorbent material. A composite comprising the absorbent material of claim 1 and a conductive material bonded to the radiation incident surface of the absorbent material. A laminate comprising at least two layers of electromagnetic radiation absorbing material, each of which meets the requirements of claim 1. A method of producing an electromagnetic radiation absorbing material comprising the following steps (a) to (c): (a) providing conductive particles comprising a central particle having an ultra-thin layer of dispersant: (b) covering the dispersion layer Creating a stable ultrathin layer of insulating material; (c) embedding the product of (b) in an insulating binder material. 21. The method of claim 20, wherein the insulating material of step (b) comprises a reaction product of the dispersion material of step (a). 30. The method of claim 29, wherein step (b) comprises introducing oxygen into the dispersion. ※ Note: The disclosure is based on the initial application.