Molybdenum disulfide/carbonyl iron composite microwave absorber with core-shell structure and preparation method thereof

A microwave absorber, molybdenum disulfide technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the single shape of MoS2, the inability to achieve uniform mixing of carbonyl iron and absorber, and limit the microwave absorption performance of composite absorbers And other problems, to achieve the effect of improving anti-corrosion ability, improving impedance matching, and improving absorption rate

Active Publication Date: 2020-04-10
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

This kind of composite absorbent not only has excellent performance, but also has a simple and convenient preparation process, but ultrasonic stripping can obtain MoS 2 The morphology is relatively simple, mainly lamellar, and it is impossible to achieve uniform wrapping of carbonyl iron and uniform mixing of the two absorbents
This will limit the maximum performance of the composite absorber

Method used

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  • Molybdenum disulfide/carbonyl iron composite microwave absorber with core-shell structure and preparation method thereof
  • Molybdenum disulfide/carbonyl iron composite microwave absorber with core-shell structure and preparation method thereof
  • Molybdenum disulfide/carbonyl iron composite microwave absorber with core-shell structure and preparation method thereof

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Embodiment 1

[0032] A molybdenum disulfide / carbonyl iron composite microwave absorber with a core-shell structure of the present invention, the composite microwave absorber is mainly composed of molybdenum disulfide nanopowder and carbonyl iron, the composite microwave absorber uses carbonyl iron as the core, disulfide Molybdenum nanopowder is evenly wrapped around carbonyl iron to form a core-shell structure.

[0033] A method for preparing the core-shell structure molybdenum disulfide / carbonyl iron composite microwave absorber of the above-mentioned present embodiment, comprising the following steps:

[0034] (1) Weigh 2.42g of sodium molybdate dihydrate Na with an analytical balance 2 MoO 4 2H 2 O (0.010mol), 3.0g thioacetamide CH 3 CSNH 2 (0.040mol), and the theoretically generated MoS 2 1.60 g of carbonyl iron micron powder with a mass ratio of 1:1, the particle size of the carbonyl iron micron powder is ≤10 μm, preferably ≤2 μm. First, pour the carbonyl iron micron powder into ...

Embodiment 2

[0038] A molybdenum disulfide / carbonyl iron composite microwave absorber with a core-shell structure of the present invention, the composite microwave absorber is mainly composed of molybdenum disulfide nanopowder and carbonyl iron, with carbonyl iron as the core, molybdenum disulfide nanopowder Uniformly wrapped around carbonyl iron to form a core-shell structure.

[0039] A method for preparing the core-shell structure molybdenum disulfide / carbonyl iron composite microwave absorber of the above-mentioned embodiment, the preparation steps are basically the same as in Example 1, the only difference is: step (1) theoretically generate MoS 2 The mass ratio of carbonyl iron micron powder is 1:2. Such as Figure 4 As shown, when the matching thickness of the composite microwave absorber is 2.3mm, the maximum reflection loss of the electromagnetic wave in the frequency range of 2-18GHz reaches -55.94dB, and the effective loss bandwidth reaches 2.74GHz.

Embodiment 3

[0041] A molybdenum disulfide / carbonyl iron composite microwave absorber with a core-shell structure of the present invention, the composite microwave absorber is mainly composed of molybdenum disulfide nanopowder and carbonyl iron, with carbonyl iron as the core, molybdenum disulfide nanopowder Uniformly wrapped around carbonyl iron to form a core-shell structure.

[0042] A method for preparing the molybdenum disulfide / carbonyl iron composite microwave absorber with the core-shell structure of the above-mentioned embodiment, the steps are basically the same as in Example 1, the only difference is: step (1) theoretically generate MoS 2 The mass ratio of carbonyl iron micron powder is 1:4. Such as Figure 5 As shown, when the matching thickness of the composite microwave absorber is 3.3mm, the maximum reflection loss of the electromagnetic wave in the frequency range of 2-18GHz reaches -45.86dB, and the effective loss bandwidth reaches 2.89GHz.

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Abstract

The invention discloses a molybdenum disulfide / carbonyl iron composite microwave absorbent with a core-shell structure and a preparation method of the molybdenum disulfide / carbonyl iron composite microwave absorbent. The composite microwave absorbent is mainly prepared from molybdenum disulfide nano-powder and carbonyl iron, carbonyl iron is taken as a core and uniformly covered with the molybdenum disulfide nano-powder, and the core-shell structure is formed. The preparation method comprises steps as follows: (1), carbonyl iron micron-powder and water are mixed, a molybdenum source and a sulfur source are added sequentially and dissolved sufficiently, pH value is regulated to be neutral, a hydrothermal reaction is performed under the sealing condition, and a hydrothermal product is obtained; (2), the hydrothermal product is subjected to high-speed centrifugal separation, obtained precipitates are washed and dried, and the molybdenum disulfide / carbonyl iron composite microwave absorbent with the core-shell structure is obtained. The composite microwave absorbent can effectively increase the maximum reflection loss value, can greatly reduce 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 molybdenum disulfide / carbonyl iron composite microwave absorber with a core-shell structure and a preparation method thereof. Background technique [0002] Research and development of high-performance microwave absorbing materials is a major topic in the field of military and civilian dual-use technology. Molybdenum disulfide is a new type of layered nanomaterial that has been studied more and more in recent years. It is widely used in many fields such as energy storage, catalysis, lubrication, semiconductors, and composite materials. And the material also has unique advantages in terms of specific surface area and electrical properties, making it have the potential to be used in the field of radar absorbing. In 2015, M. Q. Ning et al. first inspected MoS exfoliated by ultrasonic 2 Electromagnetic parameters of n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 王璟李顺林潇羽张瑞鑫穆思彤刘昊志
Owner NAT UNIV OF DEFENSE TECH
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