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Layered MXene loaded cobalt ferrite composite wave-absorbing material and preparation method thereof

A composite wave-absorbing material, cobalt ferrite technology, applied in the direction of electrical components, magnetic field/electric field shielding, etc., can solve the problem of low wave-absorbing performance, achieve low production cost, broadband strong electromagnetic wave absorption characteristics, and facilitate impedance matching Effect

Active Publication Date: 2019-09-27
湖南潼龙防务科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is: to overcome the problem of low absorbing performance of absorbing materials in the prior art, and to provide a composite absorber with multiple attenuation mechanisms and good air impedance matching with lamellar MXene loading cobalt ferrite. Wave material and its preparation method

Method used

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  • Layered MXene loaded cobalt ferrite composite wave-absorbing material and preparation method thereof
  • Layered MXene loaded cobalt ferrite composite wave-absorbing material and preparation method thereof
  • Layered MXene loaded cobalt ferrite composite wave-absorbing material and preparation method thereof

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Embodiment 1

[0025] This embodiment includes the following steps:

[0026] (1) Preparation of lamellar MXene; weigh 5gTi 3 SiC 2 The MAX phase powder was poured into a 500 ml polytetrafluoroethylene beaker filled with a hydrofluoric acid solution with a mass concentration of 40%, and magnetically stirred at a speed of 300 r / min for 24 h under the ultrasonic assistance of a power of 40 W; After the reaction was completed, the above mixed solution was allowed to stand for 2 h and then the supernatant was removed, then the black precipitate was washed 3 times with deionized water, then filtered and dried at 80° C. for 2 h to obtain MXene powder; The microscopic morphology of the test powder is as follows: figure 1 As shown, it can be seen that the MXene prepared by the present invention presents a lamellar microstructure with uniform morphology;

[0027] (2) Preparation of lamellar MXene-loaded cobalt ferrite composite absorbing material; weigh 1.2g CoCl 2 •6H 2 O and 4.1g Fe(NO 3 ) 2...

Embodiment 2

[0031] This embodiment includes the following steps:

[0032] (1) Preparation of lamellar MXene: Weigh 6gTi 3 AlC 2 The MAX phase powder was poured into a 500 mL polytetrafluoroethylene beaker filled with a 40% hydrofluoric acid solution, and stirred magnetically at a speed of 300 r / min for 12 h under the assisted action of ultrasound with a power of 60 W; After the reaction, the above mixture was left to stand for 2 hours and the supernatant was removed, then the black precipitate was washed 4 times with deionized water, then filtered and dried at 60°C for 2 hours to obtain a lamellar MXene powder;

[0033](2) Preparation of lamellar MXene-loaded cobalt ferrite composite absorbing material: weigh 2.4g CoCl 2 •6H 2 O and 5.4g Fe(Cl) 2 •6H 2 O, and dissolved in a glass flask filled with 500 mL of deionized water; pour the lamellar MXene powder obtained above into the mixed aqueous solution, and disperse evenly with magnetic stirring at 250 r / min for 5 h; Slowly add ammoni...

Embodiment 3

[0035] This embodiment includes the following steps:

[0036] (1) Preparation of lamellar MXene: Weigh 8gTi 3 SiC 2 The MAX phase powder was poured into a 500 mL polytetrafluoroethylene beaker filled with a 40% hydrofluoric acid solution, and stirred magnetically at a speed of 400 r / min for 18 h under the assistance of an ultrasonic power of 80 W; After the reaction was over, the above mixture was left to stand for 3 hours and then the supernatant was removed, then the black precipitate was washed 5 times with deionized water, then filtered and dried at 60°C for 3 hours to obtain MXene powder;

[0037] (2) Preparation of lamellar MXene-loaded cobalt ferrite composite absorbing material: Weigh 8.7g Co(NO 3 ) 2 •6H 2 O and 24.2g Fe(NO 3 ) 2 •9H 2 O, and dissolved in a glass flask filled with 500 mL of deionized water. Pour the lamellar MXene powder obtained above into the mixed aqueous solution, and disperse uniformly with magnetic stirring at 500 r / min for 3 h; slowly a...

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Abstract

The invention discloses a layered MXene loaded cobalt ferrite composite wave-absorbing material. The cobalt ferrite of the composite wave-absorbing material is loaded between layers of layered MXene, and the mass ratio of the cobalt ferrite to the layered MXene is 1: (1-3), wherein the MXene has a unique lamellar microstructure, and the surface of the MXene is rich in functional groups, so that the cobalt ferrite can be loaded between layers or on the surface of the MXene to form a dielectric-magnetic two-phase heterojunction microstructure, and the MXene has a remarkable dielectric polarization loss characteristic; the nano magnetic cobalt ferrite loaded on the MXene has a high-frequency natural resonance effect and a strong magnetic loss mechanism, and the high resistivity of the nano magnetic cobalt ferrite can weaken the strong reflection effect of the MXene on incident electromagnetic waves, so that the composite material is more beneficial to impedance matching with space; therefore, the composite material shows a broadband strong electromagnetic wave absorption characteristic, and a reflectivity result shows that the bandwidth of the composite material is superior to -10dB (90% absorption rate) and reaches 7.2 GHz, and a corresponding absorption peak reaches -21.75 dB.

Description

technical field [0001] The invention belongs to the field of composite wave-absorbing materials, in particular to a composite wave-absorbing material with lamellar MXene loaded with cobalt ferrite and a preparation method thereof. Background technique [0002] In the military field, with the rapid development of radar detection technology, radar stealth technology is increasingly concerned, and the use of wave-absorbing materials is an effective way to achieve radar stealth; in the civilian field, the development of wireless communication technology and the popularization of corresponding products have given people While daily life brings convenience, it also produces serious electromagnetic pollution and electromagnetic interference problems. The use of wave-absorbing materials is an effective means to solve electromagnetic interference and electromagnetic pollution. A large number of studies have shown that high-performance absorbing materials should have multiple electrom...

Claims

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Application Information

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IPC IPC(8): H05K9/00
CPCH05K9/0081
Inventor 贺君颜铄清邓永和陈桥
Owner 湖南潼龙防务科技有限责任公司
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