Iron-carbon nano composite electromagnetic wave absorption material and preparation method thereof

A technology of carbon nanocomposite and absorbing materials, which is applied in the field of preparation of iron-carbon nanocomposite electromagnetic wave absorbing materials, to achieve the effect of improving electromagnetic wave absorbing performance, excellent electromagnetic wave absorbing performance and good wave absorbing performance

Inactive Publication Date: 2010-10-06
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the composite material of C-wrapped metal iron nanoparticles has not been reported at home and abroad as an electromagnetic wave absorber.

Method used

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  • Iron-carbon nano composite electromagnetic wave absorption material and preparation method thereof
  • Iron-carbon nano composite electromagnetic wave absorption material and preparation method thereof
  • Iron-carbon nano composite electromagnetic wave absorption material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Iron carbonyl was used as the precursor of iron, methane was used as the precursor of C, and argon was used as the carrier gas of iron carbonyl. The carrier gas carries iron carbonyl into the gas reactor through a gas pipeline, and methane enters the gas reactor through another gas pipeline. The flow rate of the carrier gas is 150 SCCM, and the flow rate of the methane gas is 20 SCCM. Under the reaction conditions of 300-500°C, the mixed gas was thermally decomposed to prepare iron-carbon nanocomposites, and the contents of C and iron were measured by EDX energy spectrum to be 7% and 93%, respectively.

[0034] The obtained iron-carbon nanocomposite powder was mixed with epoxy resin at a mass ratio of 1:4 and pressed into a ring-shaped sample (D 外 × d 内 ×h=7×3.04×1.5mm), related parameter μ r and ε r Measured with an Agilent Technologies E8363A electromagnetic wave vector network analyzer, the reflection loss is measured by μ r , ε r , the absorption frequency and...

Embodiment 2

[0036] Iron carbonyl was used as the precursor of iron, acetylene was used as the precursor of C, nitrogen was used as the carrier gas of iron carbonyl, and the flow rate of the carrier gas was 150 SCCM. The flow rate of acetylene gas is 20SCCM. Under the reaction conditions of 300-500°C, the mixed gas is thermally decomposed to prepare iron-carbon nanocomposites. The contents of C and iron measured by EDX energy spectrum are 5% and 95% respectively.

[0037] The obtained iron-carbon nanocomposite powder was mixed with epoxy resin at a mass ratio of 1:4 and pressed into a ring-shaped sample (D 外 × d 内 ×h=7×3.04×1.5mm), related parameter μ r and ε r Measured with an Agilent Technologies E8363A electromagnetic wave vector network analyzer, the reflection loss is measured by μ r , ε r, the absorption frequency and the thickness of the sample. Measured ε r ’ and ε r ” almost keeps a constant in the range of 0.05-20.05GHz with values ​​of 17 and 0.9 respectively, μ r ’ has ...

Embodiment 3

[0039] As described in Example 1, the difference is that under the reaction conditions of 500-700 ° C, the mixed gas is prepared by thermal decomposition to obtain iron-carbon nanocomposites, and the contents of C and iron measured by EDX energy spectrum are 8% respectively and 92%.

[0040] The obtained iron-carbon nanocomposite powder was mixed with epoxy resin at a mass ratio of 1:4 and pressed into a ring-shaped sample (D 外 × d 内 ×h=7×3.04×1.5mm), related parameter μ r and ε r Measured with an Agilent Technologies E8363A electromagnetic wave vector network analyzer, the reflection loss is measured by μ r , ε r , the absorption frequency and the thickness of the sample. Measured ε r ’ and ε r ” almost keeps a constant in the range of 0.05-20.05GHz with values ​​of 13 and 0.7 respectively, μ r ’ has a maximum value of 3.7, μ r The maximum value of "is 0.94, the minimum value of its absorption peak is -37dB (decibels), the bandwidth of the absorption rate is less tha...

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Abstract

The invention relates to an iron-carbon nano composite electromagnetic wave absorption material and a preparation method thereof. Carbonyl iron, methane and acetylene serving as main raw materials are directly synthesized into the iron-carbon nano composite material in a gas-phase reaction device at the temperature of between 300 and 1,000 DEG C. The nano composite material has good stability and uniformity. The iron-carbon nano composite material is wrapped outside iron nano granules by nano-scale C to form a C film; and the iron-carbon nano composite material has the characteristics of good electromagnetic wave absorption performance, wide absorption coverage frequency range, strong corrosion and oxidation resistance and low cost, and is applicable to electromagnetic shielding in a radio communication system, electromagnetic radiation and leakage of equipment of high frequency prevention, microwave heating and the like, construction of microwave darkrooms and hiding technology.

Description

technical field [0001] The invention relates to a preparation method of an iron-carbon nanocomposite electromagnetic wave absorbing material, belonging to the technical field of electromagnetic wave absorbing materials. Background technique [0002] Magnetic loss, dielectric loss and conductive loss materials can all be used as electromagnetic wave absorbers, and magnetic loss materials have become a hot research topic because thinner electromagnetic wave absorbers can be prepared from them. For magnetic electromagnetic wave absorbing materials, the permeability and permittivity of the material determine its absorption performance. As a traditional magnetic electromagnetic wave absorbing material, ferrite has strong magnetism and low conductivity, and has been widely studied and paid attention to. But due to the Snoek limitation of the material itself, ferrite is suitable for the sub-GHz frequency range. In the GHz range of high frequency, due to the sharp decrease in magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/33B22F1/02
Inventor 刘久荣刘伟孔静王凤龙张孜君栾立强
Owner SHANDONG UNIV
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