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A kind of transition metal chalcogenide-carbonyl iron powder composite microwave absorber and preparation method thereof

A technology of microwave absorbers and chalcogenides, applied in chemical instruments and methods, and other chemical processes, can solve problems such as thinness, lightness, width, strength, low corrosion resistance, and reduced microwave absorption performance. Effects of avoiding adverse effects, improving absorption rate, and improving dielectric loss

Active Publication Date: 2018-07-06
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of material has the advantages of high saturation magnetization, large magnetic permeability and dielectric constant, but low corrosion resistance, and the skin effect caused by high electrical conductivity will lead to a decrease in magnetic permeability and a decrease in wave-absorbing performance.
It can be seen that the existing traditional absorbing materials are difficult to meet the technical requirements of "thin, light, wide and strong"

Method used

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  • A kind of transition metal chalcogenide-carbonyl iron powder composite microwave absorber and preparation method thereof
  • A kind of transition metal chalcogenide-carbonyl iron powder composite microwave absorber and preparation method thereof
  • A kind of transition metal chalcogenide-carbonyl iron powder composite microwave absorber and preparation method thereof

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Embodiment 1

[0034] A transition metal chalcogenide-carbonyl iron powder composite microwave absorber, the composite microwave absorber is mainly composed of transition metal chalcogenide flakes and carbonyl iron powder, the chemical formula of the transition metal chalcogenide is AB 2 , where A is Mo, B is S, that is, MoS 2 . The microscopic morphology of transition metal chalcogenides is flake-like, and 0<flaky transverse grain size<4 μm.

[0035] A preparation method of the transition metal chalcogenide-carbonyl iron powder composite microwave absorber of the above-mentioned embodiment, comprising the following steps:

[0036] (1) Weigh 0.1g MoS with an analytical balance 2 Coarse powder, mixed with 50.0mL organic solvent N-methyl-2-pyrrolidone (NMP), placed in a beaker to prepare a mixed solution with a concentration of 2g / L, then sealed the beaker with plastic wrap and a rubber band, placed in In a constant-temperature ultrasonic cleaner, intermittently sonicate for 5 hours, and so...

Embodiment 2

[0041] A transition metal chalcogenide-carbonyl iron powder composite microwave absorber, the composite microwave absorber is mainly composed of transition metal chalcogenide flakes and carbonyl iron powder, the chemical formula of the transition metal chalcogenide is AB 2 , where A is Mo, B is S, that is, MoS 2 . The microscopic morphology of transition metal chalcogenides is flake-like, and 0<flaky transverse grain size<4 μm.

[0042] A preparation method of the transition metal chalcogenide-carbonyl iron powder composite microwave absorber of the above-mentioned embodiment, comprising the following steps:

[0043] (1) Weigh 0.1g MoS with an analytical balance 2 Coarse powder, mixed with 50.0mL organic solvent N-methyl-2-pyrrolidone (NMP), placed in a beaker to prepare a mixed solution with a concentration of 2g / L, then sealed the beaker with plastic wrap and a rubber band, placed in In a constant-temperature ultrasonic cleaner, intermittently sonicate for 5 hours, and so...

Embodiment 3

[0048] A transition metal chalcogenide-carbonyl iron powder composite microwave absorber, the composite microwave absorber is mainly composed of transition metal chalcogenide flakes and carbonyl iron powder, the chemical formula of the transition metal chalcogenide is AB 2 , where A is Mo, B is Se, that is, MoSe 2 . The microscopic morphology of transition metal chalcogenides is flake-like, and 0<flaky transverse grain size<10 μm.

[0049] A preparation method of the transition metal chalcogenide-carbonyl iron powder composite microwave absorber of the above-mentioned embodiment, comprising the following steps:

[0050] (1) Weigh 0.1g MoSe with an analytical balance 2 Coarse powder, mixed with 50.0mL organic solvent N-methyl-2-pyrrolidone (NMP), placed in a beaker to prepare a mixed solution with a concentration of 2g / L, then sealed the beaker with plastic wrap and a rubber band, placed in In a constant-temperature ultrasonic cleaner, intermittently sonicate for 3 hours, an...

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Abstract

The invention discloses a transition metal chalcogenide-carbonyl iron powder composite microwave absorbent and a preparation method thereof. The composite microwave absorbent is mainly composed of transition metal chalcogenide flakes and carbonyl iron powder, wherein the chemical formula of the transition metal chalcogenide is AB2; A is Mo, W or Ti; B is S, Se or Te. The preparation method comprises the following steps: mixing coarse transition metal chalcogenide powder with an organic solvent; preparing the transition metal chalcogenide flakes by a liquid phase ultrasonic stripping method; then mixing the transition metal chalcogenide flakes with the carbonyl iron powder to obtain the composite microwave absorbent. The composite microwave absorbent provided by the invention can effectively increase the microwave absorption peak, broaden the microwave absorption frequency band, and greatly reduce the matching thickness, and is an ideal high-performance microwave absorbent.

Description

technical field [0001] The invention belongs to the technical field of microwave absorbers and electromagnetic shielding materials, and in particular relates to a transition metal chalcogenide-carbonyl iron powder composite microwave absorber and a preparation method thereof. Background technique [0002] Absorbing materials refer to a class of functional materials that can absorb and attenuate electromagnetic wave energy incident in space, and reduce or eliminate electromagnetic wave reflection. It has been gradually developed since the 1940s and was initially used in the stealth of weapons and equipment. The absorbing material is composed of a mixture of binder and absorber. The absorber is divided into electric loss type absorber according to the loss mode of electromagnetic wave inside the material (such as metal powder, graphite, carbon black, carbon fiber, carbon nanotube, conductive polymer, Piezoelectric ceramics, etc.) and magnetic loss absorbers (such as ferrite, m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 王璟李顺楚增勇王清华刘华磊何劲夫董鑫段景山王大印
Owner NAT UNIV OF DEFENSE TECH
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