Bimetallic cobalt-based core-shell material as well as preparation method and application thereof

A metal cobalt-based, core-shell technology, applied in metal processing equipment, coating, transportation and packaging, etc., can solve the problems of high temperature energy consumption, complicated and multi-step, harsh conditions, etc., to achieve low preparation cost and broad application prospects , the effect of low cost

Active Publication Date: 2019-01-25
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned materials adopt powder metallurgy, sputtering deposition method, laser cladding process or template method, etc., which have disadvantages such as complicated and multi-step, high temperature and high energy consumption, special requirements for equipment, long cycle time, and harsh conditions.

Method used

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  • Bimetallic cobalt-based core-shell material as well as preparation method and application thereof
  • Bimetallic cobalt-based core-shell material as well as preparation method and application thereof
  • Bimetallic cobalt-based core-shell material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 0.7137g CoCl 2 ·6H 2Dissolve O (0.05M) and 0.8g PVP in 60mL of pure ethylene glycol, stir magnetically for 2h to fully dissolve to obtain a lavender solution; then slowly add 1.76mL of 85% hydrazine hydrate dropwise and continue stirring for 1h. The resulting solution was added to a polytetrafluoroethylene lining and a powerful magnet (0.12T) was added under the lining, sealed in a stainless steel kettle, and kept at 160°C for 4h. Finally, the obtained gray-black precipitate was separated by magnetic separation, washed several times with absolute ethanol, and vacuum-dried at 40° C. to obtain the product, which was a fibrous cobalt material.

[0040] The resulting product is a gray-black fibrous solid, and its phase, the morphology observed under a scanning electron microscope, and the phase are as follows: Figure 1~3 As shown, it can be seen that the product is a fibrous structure with a size of 7-15 μm. Its energy spectrum is as Figure 4 As shown, its static magn...

Embodiment 2

[0042] The steps are the same as in Example 1, but the hydrothermal reaction temperature is 200°C. The resulting product is a gray-black fiber, and the morphology observed under a scanning electron microscope is as follows: Figure 7 As shown, the fiber diameter is 7-13 μm.

Embodiment 3

[0044] Same as Example 1 step, but add 0.3569g CoCl 2 ·6H 2 O (0.025M) and 0.88 mL volume fraction of 85% hydrazine hydrate. The resulting product is a gray-black fiber, and its morphology observed under a scanning electron microscope is as follows: Figure 8 As shown, the fiber diameter is 3-7 μm.

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Abstract

The invention relates to a bimetallic cobalt-based core-shell material and a preparation method and application thereof. A core of the bimetallic cobalt-based core-shell material is a magnetic metal Co, and a shell of the bimetallic cobalt-based core-shell material is a non-magnetic metal Ag or Cu; a shape of the bimetallic cobalt-based core-shell material is fibrous or spherical, a fiber diameteris 1.3 to 36 micrometer, and a spherical diameter is 1 to 7.3 micrometer; an atomic ratio of Co to Cu is 0.25 to 21.6, and the atomic ratio of Co to Ag is 59.8 to 74.8; a saturation magnetization strength ranges from 62.2 to 159.9 emu/g<-1>. The bimetallic cobalt-based core-shell material adopts an in-situ metal replacement method and has a microwave absorption characteristic of broadband and high absorption, wherein an effective frequency band width of which the reflectivity is less than or equal to -10dB is 5.1-7.76GHz; a bandwidth less than or equal to -20dB is 2.32-16.0GHz; a maximum reflection loss ranges from -52.5 dB to -19.7 dB. The bimetallic cobalt-based core-shell material has the advantages of simple process, easy industrial popularization, excellent material performance and good application prospect in the fields of catalysis, electrode materials, microwave absorption, high-density magnetic recording materials, sensors and the like.

Description

technical field [0001] The invention relates to the technical field of magnetic nanocomposite, in particular to a simple and controllable method for preparing a bimetallic cobalt-based core-shell material. Background technique [0002] As an important magnetic nano-metal material, cobalt-based bimetallic materials are widely used in high-temperature self-lubricating materials, structural metal materials for high-temperature components of dynamic corrosion systems, magnetic recording materials, catalysts, biosensing, and wave-absorbing materials. Commonly used cobalt-based materials are: CoNi alloy, Ni-Co-Al alloy, CoCr, CoCrTa, SmCo, Co-Cr-Al-Y, etc. These materials are mainly alloys and rarely bimetallic materials with core-shell structure. The methods for preparing cobalt-based materials mainly include powder metallurgy (high-energy ball milling mechanical alloying) method, sputtering deposition method, laser cladding process, template method, polyol reduction method, hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/02B22F1/00
CPCB22F9/24B22F1/062B22F1/065B22F1/17
Inventor 童国秀刘琳何茹佳韩佳女董雯静胡潘冰吴文华
Owner ZHEJIANG NORMAL UNIVERSITY
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