Double-shell-structure carbonyl iron powder composite wave-absorbing material and preparation method thereof

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

Active Publication Date: 2019-01-15
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 mech

Method used

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  • Double-shell-structure carbonyl iron powder composite wave-absorbing material and preparation method thereof
  • Double-shell-structure carbonyl iron powder composite wave-absorbing material and preparation method thereof
  • Double-shell-structure carbonyl iron powder composite wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0048] Example 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 grease on the surface. Mix the washed carbonyl iron powder with deionized water, stir, add KH550 surface modifier dropwise, and stir for 1 hour. Then add TEOS to the mixture, and dropwise add appropriate amount of ammonia 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 percentage of carbonyl iron powder, deionized water, surface modifier, and TEOS in the reaction system is 1:10:0.02:0.1. After the reaction, the carbonyl iron powder / SiO with core-shell structure is magnetically separated 2 The powder is washed with absolute ethanol or deionized water until the filtrate is clear, and dried at 50°C for 1 hour for later use.

[0051] Formula Mn 0.6 Zn 0.4 Fe 2 O 4 Ferrite precursor solution....

Example Embodiment

[0053] Example 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 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 add TEOS to the mixture, and add an appropriate amount of NaOH solution dropwise to adjust the pH of the solution to about 9, and mechanically stir for 2 hours until the reaction is 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, the carbonyl iron powder / SiO with core-shell structure is magnetically separated 2 The powder is washed with absolute ethanol or deionized water until the filtrate is clear, and dried at 100°C for 1 hour. Weigh appropriate amounts of Ni(NO 3 ) 2 ·6H 2 O and FeCl 3 ·6H 2 O, dissolved in deionized water to obtai...

Example Embodiment

[0057] Example 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 grease on the surface. Mix the cleaned carbonyl iron powder with alcohol, stir, add KH550 surface modifier dropwise, and stir for 1 hour. Then add TEOS to the mixture, and add an appropriate amount of ammonia water dropwise to adjust the pH of the solution to about 7, and mechanically stir for 2 hours until the reaction is complete. The mass percentage of carbonyl iron powder, alcohol, KH550 and TEOS in the reaction system is 1:8:0.05:0.3. After the reaction, the carbonyl iron powder / SiO with core-shell structure is magnetically separated 2 The powder is washed with absolute ethanol or deionized water until the filtrate is clear, and dried at 50°C for 1 hour for later use. Weigh appropriate amounts of CoCl 2 And FeCl 3 ·6H 2 O, dissolved in deionized water to obtain a mixe...

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Abstract

The invention discloses a double-shell-structure carbonyl iron powder composite wave-absorbing material and a preparation method thereof, wherein the composite wave-absorbing material is of a double shell layer core-shell structure, the core is carbonyl iron powder, the inner layer of the double-shell layer is an insulating layer, and the outer layer of the double-shell layer is a magnetic layer;the thickness of the insulating layer is 1 nm-1 [mu] m; and the thickness of the magnetic layer is 1nm-5 [mu] m; the preparation method comprises the following steps: coating the surface of the carbonyl iron powder with the insulating layer and coating the surface of a core-shell structure precursor by a chemical coprecipitation method. The surface of the carbonyl iron powder is coated with the double-shell layer by the chemical coprecipitation method. The impedance matching characteristic of the material is greatly improved, meanwhile, a large amount of nano-interface heterojunction is formedat the interfaces of the inner core and the double-shell layer, so that interface polarization is effectively induced, the scattering effect is formed for electron migration, and electromagnetic waveloss mechanisms such as multi-reflection absorption, strong ] ferromagnetic resonance and eddy current loss and the like of the material are greatly improved, so that the wave absorbing performance of the material is remarkably improved; the composite wave-absorbing material is simple in preparation method, is uniform and compact in coating and controllable in coating layer thickness and particlesize.

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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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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