Electromagnetic wave absorbing material

A technology of absorbing materials and absorbing composite materials, which is applied in the field of composite materials that can absorb electromagnetic waves, can solve the problems of application limitations, large matching thickness, and unusability, and meet the requirements of miniaturization and integration, weight reduction, and thin matching thickness Effect

Inactive Publication Date: 2010-11-17
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large matching thickness of the material in the prior art, its application is limited, and it is even completely unusable in some special application fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 2.403g of praseodymium and 7.711g of iron, and smelt them into ingots under the protection of argon. Anneal in a vacuum quartz tube at 1000°C for one week. Grind the annealed ingots with an agate mortar into about 70 micron particles, and then add 100ml isopropanol and 0.2ml phthalate coupling agent to wet mill the particles with a planetary ball mill. The ball-to-battery ratio is 20:1. The speed is 200 revolutions per minute, and the ball milling method is used in forward and reverse rotation. The time interval is 1 hour. The total time of ball milling is set to 8 hours. Finally, the sample is dried and nitrided at 490°C for 2 hours to obtain Pr 2 Fe 17 N 3-δ material. The obtained nitride is added to the titanate coupling agent diluted with isopropanol with a mass ratio of 100:1, stirred and ultrasonicated for 30 minutes, and dried. Then the samples were compounded in 3 situations: (1) The paraffin diluted with n-hexane was mixed uniformly in a volume ratio of 3...

Embodiment 2

[0033] Weigh 2.447g neodymium and 7.670g iron and smelt them into ingots under the protection of argon. Anneal in a vacuum quartz tube at 1000°C for one week. Grind the annealed ingots with an agate mortar into about 70 micron particles, and then add 100ml isopropanol and 0.2ml phthalate coupling agent to wet mill the particles with a planetary ball mill. The ball-to-battery ratio is 20:1. The speed is 200 revolutions per minute, and the ball milling method is used in forward and reverse rotation, and the time interval is 1 hour. The total time of ball milling is set to 8 hours, and finally the sample is dried and nitridated at 490℃ for 2 hours to obtain Nd 2 Fe 17 N 3-δ material. The obtained nitride is added to the titanate coupling agent diluted with isopropanol with a mass ratio of 100:1, stirred and ultrasonicated for 30 minutes, and dried. Then the samples were compounded in 3 situations: (1) The paraffin diluted with n-hexane was mixed uniformly in a volume ratio of 35...

Embodiment 3

[0038] Weigh 2.393g of cerium and 7.721g of iron, and smelt them into ingots under the protection of argon. Anneal in a vacuum quartz tube at 1000°C for one week. Grind the annealed ingots with an agate mortar into about 70 micron particles, and then add 100ml isopropanol and 0.2ml phthalate coupling agent to wet mill the particles with a planetary ball mill. The ball-to-battery ratio is 20:1. The speed is 200 revolutions per minute, and the ball milling method is used in forward and reverse rotation. The time interval is 1 hour. The total time of ball milling is set to 8 hours. Finally, the sample is dried and nitrided at 490°C for 2 hours to obtain Ce 2 Fe 17 N 3-δ material. The obtained nitride is added to the titanate coupling agent diluted with isopropanol with a mass ratio of 100:1, stirred and ultrasonicated for 30 minutes, and dried. Then the samples were compounded in 3 situations: (1) The paraffin diluted with n-hexane was mixed uniformly in a volume ratio of 35:65, ...

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Abstract

The invention discloses a material which comprises rare earth elements and iron nitrogen according to a phase ratio of 2:17 and has high capability of absorbing high-frequency electromagnetic radiation from 1G to 100G and an electromagnetic wave absorbing composite material which is made of the material and has better wave absorbing properties. The general formula of the electromagnetic wave absorbing material is R2Fe17N3-delta, and the preferred magnetization direction of the material meeting the general formula needs to be perpendicular to the C axis. In the general formula, R is one or a combination of any two of Y, Ce, Nd, Pr, Gd, Tb, Dy, Ho, Er, Tm and Lu. The method for preparing the electromagnetic wave absorbing material comprises the following steps of: adding the materials in an uncured binding material, thoroughly and uniformly mixing, then putting into a mold made of non-magnetic materials, and finally placing the mold in a magnetic field for orientation treatment.

Description

Technical field [0001] The present invention relates to an electromagnetic wave absorbing material, particularly a 2:17 phase material composed of rare earth elements and iron and nitrogen, and a composite material composed of such a material that can absorb electromagnetic waves. Background technique [0002] The extensive application of electromagnetic waves brings serious electromagnetic interference, such as radio communication (especially 3G mobile phone communication), radar detection, etc. An effective way to overcome electromagnetic wave interference is to use electromagnetic wave absorbing materials. [0003] The Chinese invention patent application 200710049468.X discloses a rare earth doped rare earth iron-based absorbing material mainly composed of α-Fe. In addition, "Broadband and thin microwave absorber of nickel-zinc ferrite / carbonyl iron" (Journal of Alloys and Compounds 487 (2009) 708-711) (hereinafter referred to as Document 1) discloses a wave absorbing composit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C33/02H01F1/059H01F1/08H05K9/00
Inventor 李发伸左文亮刘忻伊海波
Owner LANZHOU UNIVERSITY
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