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Electromagnetic-power-absorbing composite

A technology for absorbing composite materials and composite materials, which is applied in the field of composite materials and can solve the problems of difficulty in forming ferrite, limitation of maximum magnetic permeability of ferrite, and limitation of overall efficiency of magnetic permeability of absorbing materials.

Inactive Publication Date: 2003-01-15
3M CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, ferrites have a limited maximum permeability compared to metal alloys
In addition, it is difficult to form ferrite with fine needle-like or flake-like particles so that the magnetic field can sufficiently penetrate these particles
The ferrite powder is composed of nearly round particles, as a result, the magnetic field is easily demagnetized (depolarized) in the ferrite particles, thereby limiting the overall magnetic permeability of the absorbent material and its performance. - Overall efficiency of heat conversion

Method used

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  • Electromagnetic-power-absorbing composite
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  • Electromagnetic-power-absorbing composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] According to the present invention, two electromagnetic wave-absorbing composite materials were prepared as follows. Hereinafter, the two composite materials are referred to as samples 1A and 1B. The multi-layer flake powder of the two samples is first rolled on a 50.8 μm thick polyimide at a roller temperature of about 300° C. and at a conveying speed of about 16.8 m / min. The flake powder with a layer coordination number of 50 is deposited on the mesh substrate. The resulting flake powder stack consisted of alternating layers of Ni with a thickness of approximately 165 nm 81.4 Fe 18.6 Thin films and SiO with a thickness of about 40nm x film. The NiFe metal layer was magnetically oriented during deposition with an in-plane magnetic field of about 60 Oe. The resulting flake buildup was then removed from the substrate and ground into flakes using a hammer mill, star wheel and 1 mm screen, as previously described. The flakes have a largest or largest major dimension o...

Embodiment 2

[0042] Sample 1A obtained from the preceding examples was evaluated in a simulated cable termination test. Three cables (two fiber optic cables, one copper cable) with a high-density polyethylene jacket over their exteriors were used to evaluate 60-fiber-count and 216-fiber-count cables available from Siecor Corp., Hidkory, NC (4GPX-BXD from American Telephone and Telegraph Corp., Basking Ride, NJ) and a 50-unit copper hollow core cable from American Telephone and Telegraph Corp. In addition, a polyethylene sleeve (Speed ​​Duct SDR 13.5 from Pyramid industries, Inc., Erie, PA) was also used to simulate end capping. Place a 5-8 cm length of sleeve over any of the three cables above. A 2.5 cm wide strip of the composite material of Sample 1A was then wrapped around the cable a sufficient number of turns to fill the void between the cable and the bushing. The sleeve is then slid over the cable wrapped with composite material to form a mating structure. An oscillating magnetic ...

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Abstract

A electromagnetic-power-absorbing composite, comprising a binder and a plurality of multilayered flakes dispersed in the binder. The multilayered flakes include at least one layer pair comprising one thin film crystalline ferromagnetic metal layer adjacent to one thin film dielectric layer. The multilayered flakes are preferably present in an amount in the range from about 0.1% to about 10% by volume of the composite. The composite is useful for absorbing electromagnetic power having a frequency in the range from 5 to 6000 MHz so as to produce heat.

Description

field of invention [0001] The present invention relates to a composite material for absorbing electromagnetic waves (energy), and more particularly, to said composite material for generating thermal energy. Background of the invention [0002] Materials that absorb electromagnetic waves and convert the absorbed energy into heat in situ can be used for purposes such as microwave ovens, pipe joints, or cable connections. This material is typically a composite (object) material composed of one or more energy-dissipating materials and a dielectric material. [0003] In the microwave range (above about 2000MHz), the electromagnetic wave is coupled with the electric dipole in the dielectric material, thereby causing the dipole to resonate and generate heat energy. In many applications, the use of these high frequency electromagnetic waves is impractical from a safety standpoint due to the need for suppression of electromagnetic radiation in these applications. [0004] At low el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B6/74B65D81/34H01F10/14H05B6/02H05B6/64H05B6/80
CPCB65D2581/3477B65D2581/3494H05B6/6491B65D2581/3479B65D2581/3443Y10S428/90B65D2581/3464B65D81/3446Y10T428/256Y10T428/261H05B3/10
Inventor C·L·布鲁佐内C·D·霍伊尔R·L·米克洛斯
Owner 3M CO