Bimetallic cobalt-based core-shell material and its preparation method and application

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: 2022-02-15
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 and its preparation method and application
  • Bimetallic cobalt-based core-shell material and its preparation method and application
  • Bimetallic cobalt-based core-shell material and its preparation method and application

Examples

Experimental program
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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 is a bimetallic cobalt-based core-shell material and its preparation method and application. The core of the material is magnetic metal Co, and the shell is non-magnetic metal Ag or Cu; its appearance is fibrous or spherical, the fiber diameter is 1.3-36 μm, and the spherical diameter is 1-7.3 μm; the atomic ratio of Co and Cu elements 0.25-21.6, the atomic ratio of Co and Ag elements is 59.8-74.8; the saturation magnetization range is 62.2-159.9emu·g –1 . The material adopts the in-situ metal replacement method and has microwave absorption characteristics of broadband and high absorption. The effective frequency bandwidth with reflectivity less than or equal to –10dB is 5.1~7.76GHz; the bandwidth less than or equal to –20dB is 2.32~16.0GHz; The maximum reflection loss is -52.5~-19.7dB. The invention has a simple process and is easy to be popularized in industry, and the provided material has excellent performance, and has good application prospects 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 Patents(China)
IPC IPC(8): B22F9/24B22F1/062B22F1/054B22F1/065B22F1/17
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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