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A method for preparing SMCO/CO nanocomposite magnetic materials by microwave calcithermic reduction

A nano-composite and magnetic material technology, applied in the direction of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problems of difficult preparation of magnetic nano-composites and complex processes, and achieve low cost, simple process, and high magnetic performance. Improved effect

Active Publication Date: 2019-07-19
BEIHANG UNIV
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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: Aiming at the problems of difficult preparation of magnetic nanocomposites and complex processes in the prior art, a method for preparing SmCo / Co nanocomposite magnetic materials by microwave calcithermal reduction is provided, and SmCo is prepared in a simple way. / Co nanocomposite magnetic material

Method used

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  • A method for preparing SMCO/CO nanocomposite magnetic materials by microwave calcithermic reduction
  • A method for preparing SMCO/CO nanocomposite magnetic materials by microwave calcithermic reduction
  • A method for preparing SMCO/CO nanocomposite magnetic materials by microwave calcithermic reduction

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Get a 250mL three-necked flask and place it in an ultrasonic water bath, and add SmCl with a purity of 99% to the three-necked flask 3 ·6H 2 O 0.55 g of CoCl with a purity of 99.99% 2 ·6H 2 O 1.43g, then add 100mL deionized water in the three-necked flask, and mechanically stir for 10 minutes.

[0032] (2) After mechanical stirring for 10 minutes, turn on the ultrasonic instrument, and add 10 mL of 3.5 mol / L NaOH solution into the three-neck flask.

[0033] (3) After reacting for 1 hour, add 150 mL of deionized water to the reaction liquid to dilute the solution, then transfer it to 6 centrifuge tubes, centrifuge at 7500 rpm for 3 minutes, pour off the supernatant and keep the precipitate in the centrifuge tube Add deionized water to the centrifuge tube, ultrasonically clean for 5 minutes, centrifuge at 7500 rpm for 3 minutes, pour off the supernatant and keep the precipitate in the centrifuge tube; then add absolute ethanol to the centrifuge tube, and ultrasonic...

Embodiment 2

[0039] (1) Get a 250mL three-necked flask and place it in an ultrasonic water bath, and add SmCl with a purity of 99% to the three-necked flask 3 ·6H 2 O 0.55 g of CoCl with a purity of 99.99% 2 ·6H 2 O 1.43g, then add 100mL deionized water in the three-necked flask, and mechanically stir for 10 minutes.

[0040] (2) Turn on the ultrasonic device, keep mechanical stirring, and add 10 mL of 3.5 mol / L NaOH solution into the three-necked flask.

[0041] (3) After reacting for 1 hour, add 150 mL of deionized water to the reaction liquid to dilute the solution, then transfer to 6 centrifuge tubes, centrifuge at 7500 rpm for 3 minutes, pour off the supernatant and keep the precipitate in the centrifuge tube Add deionized water to the centrifuge tube, ultrasonically clean for 5 minutes, centrifuge at 7500 rpm for 3 minutes, pour off the supernatant and keep the precipitate in the centrifuge tube; then add absolute ethanol to the centrifuge tube, and ultrasonically clean for five m...

Embodiment 3

[0047] (1) Get a 250mL three-necked flask and place it in an ultrasonic water bath, and add SmCl with a purity of 99% to the three-necked flask 3 ·6H 2 O 0.55 g of CoCl with a purity of 99.99% 2 ·6H 2 O 1.30g, then add 100mL deionized water to the three-necked flask, and mechanically stir for 10 minutes.

[0048] (2) After mechanical stirring for 10 minutes, turn on the ultrasonic instrument, and add 10 mL of 3.5 mol / L NaOH solution into the three-neck flask.

[0049] (3) After reacting for 1 hour, add 150 mL of deionized water to the reaction liquid to dilute the solution, then transfer to 6 centrifuge tubes, centrifuge at 7500 rpm for 3 minutes, pour off the supernatant and keep the precipitate in the centrifuge tube Add deionized water to the centrifuge tube, ultrasonically clean for 5 minutes, centrifuge at 7500 rpm for 3 minutes, pour off the supernatant and keep the precipitate in the centrifuge tube; then add absolute ethanol to the centrifuge tube, and ultrasonicall...

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Abstract

The invention relates to a method for preparing an SmCo / Co nano-composite magnetic material through microwave calcium thermal reduction, and belongs to the field of magnetic materials. The method ischaracterized in that an SmCo-OH precursor is prepared by using an ultrasonic co-precipitation method, and then the SmCo / Co nano-composite magnetic material is prepared by adopting the microwave calcium thermal reduction method, a hard magnetic phase is SmCo5 and Sm2co17, a soft magnetic phase is Co, and an exchange coupling effect exists between the hard magnetic phase and the soft magnetic phase. Compared with samples prepared without a microwave auxiliary under the same temperature, the magnetic performance is greatly improved. The method is simple in technology, and provides a new approach for preparing the nano-composite magnetic materials.

Description

technical field [0001] The invention relates to a method for preparing SmCo / Co nanocomposite magnetic materials through microwave calcithermic reduction, which belongs to the field of magnetic materials. Background technique [0002] Permanent magnetic materials have important application prospects in aerospace, communications, computers, automobiles, household appliances and other fields. With the rapid development of science and technology, new requirements are constantly put forward for the performance of permanent magnet materials, and the demand for them is also greatly increased. SmCo material is a typical permanent magnet material with excellent magnetic properties, such as large magnetic energy product, strong magnetocrystalline anisotropy, reliable coercive force, etc. It is the preferred material especially in some military fields. However, the saturation magnetization of SmCo materials is relatively low, and how to increase its saturation magnetization to improve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/055H01F41/00
CPCH01F1/0553H01F41/00
Inventor 蒋成保董莹张天丽王慧张明王敬东蔡明光
Owner BEIHANG UNIV
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