A ferrite-based low-frequency electromagnetic absorbing material and preparation method thereof

An electromagnetic wave absorbing and ferrite technology, applied in chemical instruments and methods, iron compounds, electrical components, etc., can solve the problems of automatic control failure of the system, information transmission errors, interruption of radio wave transmission, etc., to achieve good electromagnetic wave absorption effect, Extend the absorption bandwidth and increase the effect of diffuse reflection

Active Publication Date: 2020-10-02
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thereby affecting and interfering with the normal operation of other electronic instruments around, causing their performance to decline or even fail. In severe cases, the automatic control of the system may fail, information transmission errors, radio wave transmission interruption, etc., directly or indirectly causing serious economic losses and casualties

Method used

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  • A ferrite-based low-frequency electromagnetic absorbing material and preparation method thereof

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preparation example Construction

[0040] The preparation method comprises the following steps:

[0041] S1: Dissolving sodium borohydride and sodium hydroxide powder in deionized water and forming a transparent sodium borohydride aqueous solution under the action of magnetic stirring;

[0042] S2: Add appropriate amount of lithium zinc ferrite particles, ferrous sulfate, and PVP into deionized water and mechanically stir for 30 minutes;

[0043] S3: dropping the mixed solution of sodium borohydride aqueous solution and lithium-zinc ferrite into the electroless plating reaction tank to fully react;

[0044] S4: Collect the reaction product with a magnet, wash and dry, and grind to obtain the final product: lithium zinc ferrite powder with nano-iron sheets on the surface.

[0045] Lithium zinc ferrite is prepared from metal salt solution, sodium citrate and ammonia water.

[0046] Lithium zinc ferrite includes: lithium element, zinc element, iron element, cerium element and oxygen element;

[0047] The stoich...

Embodiment 1

[0055] Embodiment 1, preparation of electromagnetic wave absorbing agent based on ferrite;

[0056] The lithium zinc ferrite particle of this embodiment, the stoichiometric ratio of each component is as follows:

[0057] The stoichiometric ratio of each element in the metal salt solution lithium: zinc: iron: cerium: oxygen=0.4:0.2:2.35:0.3:4;

[0058] Described metal salt solution comprises lithium nitrate, zinc nitrate, ferric nitrate, cerium nitrate solution;

[0059] The molar ratio of the total molar number of metal ions in the metal salt solution to the citric acid molecule is 1.

[0060] The present invention also provides the preparation of the lithium zinc ferrite, comprising the following steps:

[0061] a. Weigh quantitative lithium nitrate, zinc nitrate, iron nitrate, cerium nitrate and other metal compounds according to the specific stoichiometric ratio of lithium zinc ferrite, and dissolve them in deionized water together, and electromagnetically stir until unif...

Embodiment 2

[0074] Embodiment 2, preparation of electromagnetic wave absorbing agent based on ferrite;

[0075] The lithium zinc ferrite particle of this embodiment, the stoichiometric ratio of each component is as follows:

[0076] The stoichiometric ratio of each element in the metal salt solution lithium: zinc: iron: cerium: oxygen=0.25:0.5:2.3:0.2:4;

[0077] Described metal salt solution comprises lithium nitrate, zinc nitrate, ferric nitrate, cerium nitrate solution;

[0078] The molar ratio of the total molar number of metal ions in the metal salt solution to the citric acid molecule is 1.

[0079] The present invention also provides the preparation of the lithium zinc ferrite, comprising the following steps:

[0080] a. Weigh quantitative lithium nitrate, zinc nitrate, iron nitrate, cerium nitrate and other metal compounds according to the specific stoichiometric ratio of lithium zinc ferrite, and dissolve them in deionized water together, and electromagnetically stir until unif...

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PUM

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Abstract

The invention discloses a ferrite-based low frequency electromagnetic wave-absorbing material and a preparation method thereof. The ferrite-based low frequency electromagnetic wave-absorbing particlesare of core-shell structures; the core-shell structures comprise micron-sized lithium zinc ferrite particles and nano-sized iron sheets. The preparation method includes: a sol-gel method, a high-temperature calcination method and an in-situ reduction method; the lithium zinc ferrite is prepared by the sol-gel method and high-temperature calcination; and the iron sheets grow on surfaces of the prepared lithium zinc ferrite through the in-situ reduction method. The invention can provide an electromagnetic wave-absorbing agent based on the lithium zinc ferrite; the lithium zinc ferrite has a good electromagnetic wave absorption effect in the low frequency electromagnetic band of 0.1-4 GHz.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave absorption and protection, in particular to a ferrite-based low-frequency electromagnetic wave absorbing material and a preparation method thereof. Background technique [0002] As the power industry plays an increasingly important role in all aspects of society and life, modern society has higher and higher requirements for the reliability of power supply, and the status of power supply security is more important than ever. In recent years, with the faster and faster economic growth, the upgrading of power grid construction, the improvement of voltage level and the increase of power coverage area have been promoted. With the wide use of various electronic devices and equipment with high sensitivity and large amount of information in the power generation, production, transmission, distribution, and consumption of power systems, the electromagnetic environment of the power system (elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00C09K3/00C01G49/00
CPCC01G49/0063C09K3/00H05K9/0081
Inventor 杨芾藜侯兴哲张晓勇郑可宫林刘型志张兵周谭杰
Owner STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST
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