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Rare earth Fe basis suction wave material and method for making the same

A wave-absorbing material and rare earth technology, applied in the field of wave-absorbing materials, can solve problems such as difficult to meet high performance, lower soft magnetic properties, unfavorable wave-absorbing performance, etc., and achieve the effect of low oxidation resistance, low cost, and good wave-absorbing performance

Inactive Publication Date: 2008-06-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal soft magnetic materials have high conductivity and are prone to decrease in soft magnetic properties due to eddy current loss in electromagnetic waves, which is not conducive to the improvement of wave-absorbing performance.
The traditional preparation method is to break it into very fine particles and coat it with insulating materials, but it is difficult to meet the requirements of high performance due to the influence of the particle size, shape of the powder, and the thickness and uniformity of the coating layer.
[0003] Rare earth-iron-based alloys have been widely used as permanent magnet materials because of their excellent magnetic properties, but there are few reports about them as electromagnetic wave absorbing materials at home and abroad.

Method used

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  • Rare earth Fe basis suction wave material and method for making the same
  • Rare earth Fe basis suction wave material and method for making the same
  • Rare earth Fe basis suction wave material and method for making the same

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Effect test

Embodiment 1

[0019] In this embodiment, 25% samarium and 75% pure iron are smelted into ingots under the protection of argon, and the hydrogen explosion (HD) method is used to make it broken and decomposed into nanocrystalline SmHx / α-Fe composite structure , and then nitrided into nanocrystalline samarium nitride / α-Fe dual-phase powder, the alloy powder is mixed with paraffin at a ratio of 1:5, and then pressed into rings (D=7mm, d=3.01mm, h=3mm) and rectangular (L*W=7.2*3.6mm, thickness 0.9mm), the reflection coefficient of the sample is measured by Agilent E8363 electromagnetic wave vector network analyzer. Related parameter μ r , ε r Determined by the scattering coefficient and the thickness of the sample, ε" reaches 10 at a frequency of 5 GHz, μ' reaches a maximum of 3.21, and μ" reaches a maximum of 0.95. Its absorption peak reaches -45 decibels (dB), and the bandwidth of the absorption rate less than -10dB is 5GHz, the absorbing curve is as figure 1 shown.

Embodiment 2

[0021] In this embodiment, 40% samarium and 60% pure iron are smelted into ingots under the protection of argon, and are broken and decomposed into nanocrystalline SmHx / α-Fe composite structure by hydrogen explosion (HD). , and then oxidized into nanocrystalline samarium oxide / α-Fe dual-phase powder, the alloy powder was mixed with paraffin at a ratio of 1:5, and then pressed into rings (D=7mm, d=3.01mm, h=3mm) and Rectangle (L*W=7.2*3.6mm, thickness 0.9mm), the reflection coefficient of the sample is measured by Agilent E8363 electromagnetic wave vector network analyzer. Related parameter μ r , ε r Determined by the scattering coefficient and the thickness of the sample, ε″ reaches 3.15 at a frequency of 7.6GHZ, the maximum value of μ′ is 2.9, and the maximum value of μ″ is 0.86. The absorption peak reaches -50 decibels (dB), and the absorption rate is less than the bandwidth of -10dB is 5.1GHz, the absorbing curve is as figure 2 shown.

Embodiment 3

[0023] In this embodiment, 12% neodymium, 86% pure iron and trace amounts of tungsten and chromium elements are used in this embodiment, melted into ingots under the protection of argon, and are broken and decomposed into nanometers by hydrogen explosion (HD). crystalline NdHx / α-Fe composite structure, then crushed into powder, and then nitrided into nanocrystalline samarium nitride / α-Fe dual-phase composite powder, the alloy powder is mixed with paraffin at a ratio of 1:5, and then pressed into rings (D=7mm, d=3.01mm, h=3mm) and rectangular (L*W=7.2*3.6mm, thickness 0.9mm) reflection coefficients of samples were measured with Agilent E8363 electromagnetic wave vector network analyzer. Related parameter μ r , ε r Determined by the scattering coefficient and the thickness of the sample, ε″ reaches 4.0 at a frequency of 8GHZ, μ′ reaches a maximum of 4, and μ″ reaches a maximum of 1.2. The absorption peak reaches -50 decibels (dB), and the bandwidth of the absorption rate less t...

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Abstract

The invention discloses a nano-crystal tombar thite ferrous absorbing material with good absorbing property and a preparation method thereof. The material is characterized in that the lanthanon with the weight percentage of 2% and 70%, the iron with the weight percentage of 5% and 98% and the little amount of doping element are smelted into tombar thite-ferrous alloy; the tombar thite-ferrous alloy is reacted with hydrogen by hydrogen decrepitation method under the temperature range from 0 to 700 DEG C, is broken into fine powder or be ball grinded into fine powder, and then is reacted with hydrogen to generate composite material of rare earths hydride (RHx) and Alpha-Fe under the temperature range from 100 DEG C to 1000 DEG C; finally, the composite material is oxidized, nitridized or oxidized and nitridized under low temperature to produce the composite material mainly being rare earth oxide or nitride / Alpha-Fe composite material. The material of the invention has the advantages of high absorbing capability, wide shield wave band, good anti-corrosion property, anti-oxidation property and low price, and can be used in the fields of electro-magnetic shielding in building, information and communication technical secrecy and military cloaking technique, and so on.

Description

technical field [0001] The invention belongs to the field of wave-absorbing materials, in particular to a composite material with a nanostructure for absorbing electromagnetic waves and a preparation method. Background technique [0002] With the advancement of science and technology and the rapid development of the information industry, equipment (systems) such as computers, mobile phones, fax machines, telephones, and networks have been widely used in the processing of information generation, transmission, reception, and storage. This type of equipment is inseparable from the action of electromagnetic waves when working. The wide application of electromagnetic waves has brought increasingly serious electromagnetic interference (EMI). An effective way to reduce electromagnetic interference is to use microwave absorbing materials to convert unnecessary or harmful electromagnetic energy into heat energy. Metal soft magnetic materials have extremely high saturation magnetizat...

Claims

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Application Information

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IPC IPC(8): H05K9/00C22C38/00
Inventor 刘颖叶金文陈先富涂铭旌
Owner SICHUAN UNIV
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