Three-dimensional porous manganese oxide-cobalt composite electromagnetic wave absorbing material and its preparation method and application

A technology of three-dimensional porous and absorbing materials, which is applied in electrical components, metal processing equipment, magnetic field/electric field shielding, etc., can solve the problems of narrow effective absorption bandwidth, poor impedance matching characteristics, strong electromagnetic wave reflection, etc., to improve electromagnetic wave absorption performance, Effects of increased resistivity and high magnetic permeability

Active Publication Date: 2020-01-17
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the deficiencies of the existing pure cobalt electromagnetic wave absorbing materials, such as high electrical conductivity, strong electromagnetic wave reflection, high density, poor impedance matching characteristics, and narrow effective absorption bandwidth, the present invention aims to provide a three-dimensional porous manganese oxide-cobalt composite electromagnetic wave absorbing material and its The preparation method and application, the preparation of the electromagnetic wave absorbing material of the present invention is not only low in cost and easy to prepare, but also the prepared composite electromagnetic wave absorbing material has excellent saturation magnetic susceptibility and coercive force, reflecting excellent absorption performance for electromagnetic waves; in addition, the present invention The composite electromagnetic wave absorbing material prepared by the invention also has the characteristics of light weight

Method used

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  • Three-dimensional porous manganese oxide-cobalt composite electromagnetic wave absorbing material and its preparation method and application
  • Three-dimensional porous manganese oxide-cobalt composite electromagnetic wave absorbing material and its preparation method and application
  • Three-dimensional porous manganese oxide-cobalt composite electromagnetic wave absorbing material and its preparation method and application

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Embodiment 1

[0052] A method for preparing a three-dimensional porous manganese oxide-cobalt composite electromagnetic wave absorbing material, comprising the following steps:

[0053] (1) with Co(CH 3 COO) 2 4H 2 O as cobalt source, Mn(CH 3 COO) 2 4H 2 O is used as a manganese source, and polyvinylpyrrolidone (PVP-K30) is used as a shape control agent and a dispersant. The above-mentioned cobalt source, manganese source, and PVP-K30 are added in 60mL of ethylene glycol solvent at an addition ratio of 2mmol:1mmol:0.6g, The obtained mixture was reacted at 200°C for 24 hours under airtight conditions; after the reaction was completed, the product was washed and dried at 60°C for 12 hours to obtain a manganese-cobalt hydroxide precursor;

[0054] (2) Heat the manganese-cobalt hydroxide precursor prepared in step (1) at 400°C for 2 hours for calcination; after completion, place the calcined product in a tube furnace with a hydrogen flow rate of 30mL / min React at 450° C. for 1 hour, there...

Embodiment 2

[0061] Make electromagnetic wave absorber with the three-dimensional porous manganese oxide-cobalt composite electromagnetic wave absorbing material prepared in embodiment 1, and carry out test experiment, specifically as follows:

[0062] The composite electromagnetic wave absorbing material and paraffin are mixed according to the mass ratio of 80%: 20%, and then pressed into a ring-shaped sample (D 外 × d 内 ×h=7×3.04×2.0mm), related parameter μ r and ε r Measured with Agilent Technologies N5244A electromagnetic wave vector network analyzer, the reflection loss is measured by μ r , ε r , the absorption frequency and the thickness of the sample are determined, the results are as follows Figure 6 The electromagnetic wave absorption curve is shown as:

[0063] Measured ε r ' fluctuates very little in the frequency range of 2-18GHz, and its value is about 7.6.

[0064] Measured ε r "There are two formants with the same peak at 7-12GHz with a value of 0.5, and a smaller fo...

Embodiment 3

[0069] A method for preparing a three-dimensional porous manganese oxide-cobalt composite electromagnetic wave absorbing material, comprising the following steps:

[0070] (1) with CoCl 2 ·6H 2 O as cobalt source, MnCl 2 4H 2 O is used as a manganese source, and polyvinylpyrrolidone (PVP-K30) is used as a shape control agent and a dispersant. The above-mentioned cobalt source, manganese source, and PVP-K30 are added to 60mL of ethylene glycol solvent in a mass ratio of 1.5mmol:1.5mmol:1g In the process, the obtained mixture was reacted at 150° C. for 18 hours under airtight conditions; after the reaction was completed, the product was washed and dried to obtain a manganese-cobalt hydroxide precursor;

[0071] (2) Heat the manganese-cobalt hydroxide precursor prepared in step (1) at 600°C for 1 hour for calcination; after completion, place the calcined product in a tube furnace with a hydrogen flow rate of 35 mL / min. React at 350° C. for 2 hours, thereby reducing the mangan...

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Abstract

The invention relates to the technical field of electromagnetic wave absorbing materials, in particular to a three-dimensional porous manganese oxide-cobalt composite electromagnetic wave absorbing material and its preparation method and application. The composite electromagnetic wave absorbing material includes nano-scale manganese oxide and nano-scale cobalt particles, wherein the nano-scale manganese oxide and nano-scale cobalt particles composite to form a nano-scale porous sheet structure, and the porous sheet structure forms a single Dispersed three-dimensional flower-like ball structure. The preparation of the electromagnetic wave absorbing material of the present invention is not only low in cost and easy to prepare, but also the prepared composite electromagnetic wave absorbing material has excellent saturation magnetic susceptibility and coercive force, reflecting excellent absorption performance for electromagnetic waves; in addition, the composite electromagnetic wave absorbing material prepared by the present invention The absorbent material is also lightweight.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave absorbing materials, in particular to a three-dimensional porous manganese oxide-cobalt composite electromagnetic wave absorbing material and its preparation method and application. Background technique [0002] With the rapid development of modern technology and the electronic industry, various electronic communication devices have been widely used in various fields, bringing great convenience to people's production and life. However, various digital and high-frequency electronic and electrical equipment radiate a large number of electromagnetic waves of different wavelengths to the surrounding environment during work, which leads to new environmental pollution-electromagnetic pollution. At the same time, electronic components are also developing in the direction of miniaturization, light weight, digitalization and high-density integration. The sensitivity is getting higher and highe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00B22F1/00B22F9/22
CPCH05K9/0081B22F9/22B22F1/07B22F1/065
Inventor 刘久荣刘伟徐冬梅吴莉莉王凤龙汪宙
Owner SHANDONG UNIV
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