Method for absorbing microwaves by adopting dielectric/ferromagnetic composite material

A composite material and dielectric technology, applied in radiation-absorbing coatings, chemical instruments and methods, and other chemical processes, etc., can solve problems such as narrow absorption frequency bands, and achieve the effect of wide frequency band, broad application prospects, and low density.

Active Publication Date: 2014-12-31
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for absorbing microwaves using a dielectric/ferromagnetic c

Method used

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  • Method for absorbing microwaves by adopting dielectric/ferromagnetic composite material
  • Method for absorbing microwaves by adopting dielectric/ferromagnetic composite material
  • Method for absorbing microwaves by adopting dielectric/ferromagnetic composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Described dielectric / ferromagnetic composite microwave absorbing material, its preparation steps are:

[0024] (1) Using the sol-gel method, using ethylene glycol methyl ether and monoethanolamine as solvents, lanthanum nitrate and nickel acetate as starting materials, and annealing in air at 700 ° C for 1.5 hours to obtain a loose and porous nickel acid with oxygen vacancies Lanthanum powder (as figure 1 shown);

[0025] (2) Carbon-coated iron-cobalt nanocapsules were prepared by DC plasma arc method;

[0026] (3) 50wt% lanthanum nickelate (LaNiO 3 ) powder and 50wt% carbon-coated iron-cobalt (FeCo / C) nanocapsules are dispersed in ethanol, and then the two suspensions are ultrasonically mixed, mixed evenly and then dried to obtain LaNiO 3 - FeCo / C (50 / 50) composite material.

[0027] (4) Preparation of absorbing samples:

[0028] 0.4g LaNiO prepared in step (3) 3 - FeCo / C (50 / 50) composite material mixed with 0.6g paraffin (LaNiO 3 -FeCo / C (50 / 50) composite mate...

Embodiment 2

[0030] Described dielectric / ferromagnetic composite microwave absorbing material, its preparation steps are:

[0031] (1) Using the sol-gel method, using ethylene glycol methyl ether and monoethanolamine as solvents, lanthanum nitrate and nickel acetate as starting materials, and annealing in air at 700 ° C for 1.5 hours to obtain a loose and porous nickel acid with oxygen vacancies Lanthanum powder (as figure 1 shown);

[0032] (2) Carbon-coated iron-cobalt nanocapsules were prepared by DC plasma arc method;

[0033] (3) 80wt% lanthanum nickelate (LaNiO 3 ) powder and 20wt% carbon-coated iron-cobalt (FeCo / C) nanocapsules are dispersed in ethanol, and then the two suspensions are ultrasonically mixed, mixed evenly and then dried to obtain LaNiO 3 - FeCo / C (80 / 20) composite material.

[0034] (4) Preparation of absorbing samples:

[0035] 0.4g LaNiO prepared in step (3) 3 - FeCo / C (80 / 20) composite material mixed with 0.6g paraffin (LaNiO 3 -FeCo / C (80 / 20) composite mate...

Embodiment 3

[0037] The difference from Example 2 is: lanthanum nickelate (LaNiO 3 ) powder and carbon-coated iron-cobalt (FeCo / C) nanocapsules with a mass ratio of 20:80, the resulting composite material is LaNiO 3 -FeCo / C(20 / 80), the reflection loss of the absorbing sample made of this composite material has an absorption lower than -10dB at different frequencies (see Figure 6 ).

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Abstract

The invention aims to provide a method for absorbing microwaves by adopting a dielectric/ferromagnetic composite material, and is used for solving the deficiency of narrow absorbing frequency band of a single-species wave absorbing material. The composite material takes a lanthanum nickelate powder as a dielectric component, and takes carbon-coated iron cobalt as a ferromagnetic component. The composite material has the advantages of small density and wide frequency band width, and has broad application prospects in electromagnetic shielding, photoelectric materials, electrorheological fluids, functional coatings and the like.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave absorption, and particularly provides a method for absorbing microwaves by using a dielectric / ferromagnetic composite material. Background technique [0002] Microwave absorbing materials refer to materials that can absorb microwaves and convert them into heat energy. Such materials have been widely used in military and civilian fields such as electromagnetic pollution shielding and stealth technology. Microwave absorbing materials can be divided into dielectric loss materials and magnetic loss materials according to the loss mechanism. Dielectric loss absorbing materials are represented by carbon black and barium titanate, and magnetic loss materials include ferrite and magnetic metal particles. . Absorbing materials with a single loss type often have the disadvantage of narrow absorption band, while composite materials with different loss mechanisms can achieve the purpose of broadening the ...

Claims

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Application Information

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IPC IPC(8): C09K3/00C09D5/32C09D7/12
Inventor 姜菁菁李达耿殿禹李少杰刘伟张志东
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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