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A double-shell structure carbonyl iron powder composite wave-absorbing material and its preparation method

A technology of composite absorbing materials and carbonyl iron powder, which is applied in chemical instruments and methods, other chemical processes, electrical components, etc., can solve problems such as low absorbing performance, single absorbing mechanism, poor impedance matching performance, etc. Excellent covering effect, good oxidation resistance, and strong absorbing performance

Active Publication Date: 2021-06-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the impedance matching performance of this type of material is poor, and the absorbing mechanism of the material is relatively simple, so that the absorbing performance of the material is low.

Method used

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  • A double-shell structure carbonyl iron powder composite wave-absorbing material and its preparation method
  • A double-shell structure carbonyl iron powder composite wave-absorbing material and its preparation method
  • A double-shell structure carbonyl iron powder composite wave-absorbing material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] mn 0.6 Zn 0.4 Fe 2 o 4 / SiO 2 / Preparation of carbonyl iron powder composite absorbing material:

[0050] Take 100g of carbonyl iron powder and wash it twice with alcohol to remove impurities and oil stains on the surface. Mix the cleaned carbonyl iron powder with deionized water, stir, add KH550 surface modifier dropwise, and stir for 1 hour. Then add tetraethyl orthosilicate TEOS to the mixture, and drop an appropriate amount of ammonia water NH 4 OH, adjust the pH of the solution to about 10, and stir vigorously for 4 hours until the reaction is complete. The mass percentages of carbonyl iron powder, deionized water, surface modifier and TEOS in the reaction system are: 1:10:0.02:0.1. After the reaction, carbonyl iron powder / SiO with core-shell structure was magnetically separated 2 powder, washed with absolute ethanol or deionized water until the filtrate was clear, and dried at 50°C for 1 h for later use.

[0051] Prepared Mn 0.6 Zn 0.4 Fe 2 o 4 Ferri...

Embodiment 2

[0054] NiFe 2 o 4 / SiO 2 / Preparation of carbonyl iron powder composite absorbing material:

[0055] Take 100g of carbonyl iron powder and wash it with alcohol for 3 times to remove impurities and oil stains on the surface. Mix the cleaned carbonyl iron powder with alcohol, stir, add KH560 surface modifier dropwise, and stir for 0.5h. Then, tetraethyl orthosilicate TEOS was added to the mixture, and an appropriate amount of NaOH solution was added dropwise to adjust the pH value of the solution to about 9, and the mixture was vigorously stirred for 2 hours until the reaction was complete. The mass percentages of carbonyl iron powder, alcohol, KH560 and TEOS in the reaction system are: 1:3:0.01:0.02. After the reaction, carbonyl iron powder / SiO with core-shell structure was magnetically separated 2 powder, washed with absolute ethanol or deionized water until the filtrate was clear, and dried at 100°C for 1 h for later use. Weigh an appropriate amount of Ni(NO 3 ) 2 ·6...

Embodiment 3

[0058] CoFe 2 o 4 / SiO 2 / Preparation of carbonyl iron powder composite absorbing material:

[0059] Take 100g of carbonyl iron powder and wash it twice with alcohol to remove impurities and oil stains on the surface. Mix the cleaned carbonyl iron powder with alcohol, stir, add KH550 surface modifier dropwise, and stir for 1h. Then add tetraethyl orthosilicate TEOS to the mixture, and add an appropriate amount of ammonia water dropwise to adjust the pH value of the solution to about 7, and stir vigorously for 2 hours until the reaction is complete. The mass percentages of carbonyl iron powder, alcohol, KH550 and TEOS in the reaction system are: 1:8:0.05:0.3. After the reaction, carbonyl iron powder / SiO with core-shell structure was magnetically separated 2 powder, washed with absolute ethanol or deionized water until the filtrate was clear, and dried at 50°C for 1 h for later use. Weigh an appropriate amount of CoCl 2 and FeCl 3 ·6H 2 O, dissolved in deionized water ...

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Abstract

A double-shell structure carbonyl iron powder composite wave-absorbing material and its preparation method, the composite wave-absorbing material is a double-shell core-shell structure, the inner core is carbonyl iron powder, the inner layer of the double-shell layer is an insulating layer, and the outer layer is Magnetic layer; the thickness of the insulating layer is 1nm-1μm; the thickness of the magnetic layer is 1nm-5μm. The preparation method includes coating an insulating layer on the surface of the carbonyl iron powder by a chemical co-precipitation method and coating a magnetic layer on the surface of the core-shell structure precursor. The present invention uniformly coats the double-shell layer on the surface of the carbonyl iron powder by the chemical co-precipitation method, which greatly improves the impedance matching characteristics of the material. Polarization, which forms a scattering effect on electron migration, greatly improves the electromagnetic wave loss mechanisms such as multiple reflection absorption, strong ferromagnetic resonance, and eddy current loss of the material, thereby significantly improving the wave absorption performance of the material; the preparation method is simple, the coating is uniform, dense, and the coating Coating thickness and particle size are controllable.

Description

technical field [0001] The invention relates to an electromagnetic wave absorbing material, in particular to a double-shell structure carbonyl iron powder composite wave-absorbing material and its preparation method, specifically to a double-shell structure MFe 2 o 4 / SiO 2 The invention relates to a carbonyl iron powder composite wave absorbing material and a preparation method thereof, belonging to the technical field of electromagnetic wave absorbing materials. Background technique [0002] Electromagnetic interference between internal components of equipment, electromagnetic stealth technology in the military field, microwave guidance of missiles, information leakage in the field of wireless communication, etc. have drawn wide attention to electromagnetic wave absorbing materials. Broadband, strong absorption of electromagnetic wave absorbing material. When the electromagnetic wave is incident on the surface of the wave-absorbing material, the incident electromagnetic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00H05K9/00
CPCC09K3/00H05K9/0088
Inventor 李丽娅陈秋丽葛毅成
Owner CENT SOUTH UNIV
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