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A kind of nano two-phase composite permanent magnet particle and preparation method thereof

A nano and permanent magnet technology, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problem of simultaneous control of nanoscale continuity of difficult-to-deposit particles, improvement of remanence and energy product of dual-phase composite materials, The theoretical saturation magnetization of the soft magnetic phase Co is low, so as to avoid the collapse of the hysteresis curve, increase the magnetic energy product, and reduce the cost

Active Publication Date: 2019-12-06
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, N.Poudyal et al prepared SmCo by sonochemical method 5 / FeCo dual-phase composites, but the soft magnetic phase size is in the range of 20-50nm, resulting in SmCo 5 The / FeCo hysteresis curve is severely collapsed, which affects the SmCo 5 Improvement of remanence and energy product of / FeCo dual-phase composites
It is difficult to realize the simultaneous control of the nanonization of deposited particles and the continuity of the deposited film with the current packaging methods, and it is more challenging to control the soft magnetic phase particles to about 10nm
F.Q.Wang et al. prepared Sm–Pr–Co / Co dual-phase composites by chemical deposition method, but the selected Sm–Pr–Co hard magnetic phase has a small coercive force and the soft magnetic phase Co has a relatively low theoretical saturation magnetization. low, so the remanence and energy product of the prepared Sm–Pr–Co / Co dual-phase composites are limited

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  • A kind of nano two-phase composite permanent magnet particle and preparation method thereof
  • A kind of nano two-phase composite permanent magnet particle and preparation method thereof
  • A kind of nano two-phase composite permanent magnet particle and preparation method thereof

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preparation example Construction

[0020] An aspect of the embodiments of the present invention provides a method for preparing nano-two-phase composite permanent magnet particles, which includes:

[0021] Uniformly disperse the hard magnetic phase powder in the solvent to form a hard magnetic phase powder dispersion;

[0022] In a protective atmosphere, the hard magnetic phase powder dispersion is adjusted to alkaline with alkaline substances, and at least a reducing agent and a soft magnetic phase precursor material are added, and after mixing and reaction, nanometer two-phase composite permanent magnetic particles are obtained .

[0023] As one of the preferred solutions, the preparation method includes: pretreating the hard magnetic phase powder with an acid solution, and then uniformly dispersing the hard magnetic phase powder in a solvent to form the hard magnetic phase powder dispersion. Pretreatment of the hard magnetic phase powder with acid can remove the oxide layer on the surface of the hard magnet...

Embodiment 1

[0062] (1) Take 0.12g SmCo 5 Disperse in 60ml of absolute ethanol, add 0.5ml of dilute hydrochloric acid, react in a water bath at 60°C for 10 minutes, remove the acid solution after the reaction, pass in Ar gas as a protective gas, and use mechanical stirring and ultrasonic dispersion;

[0063] (2) SmCo pretreated with hydrochloric acid 5 Disperse in 60ml of absolute ethanol, add 1g of PVP as a dispersant, dissolve 0.4g of NaOH in 20ml of absolute ethanol and add it dropwise to SmCo with a syringe 5 dispersion, then 3ml N 2 h 4 ·H 2 O was added dropwise to SmCo with a peristaltic pump at a rate of 0.15ml / min. 5 In the dispersion, at the same time 0.0143g FeCl 2 4H 2 O dissolved in 20ml absolute ethanol and 0.0092g CoCl 2 ·6H 2 O was dissolved in 20ml absolute ethanol and added dropwise to the SmCo with a syringe 5 In the dispersion liquid, react in a water bath at 60°C for 30 minutes, pass Ar gas as a protective gas, and disperse with mechanical stirring and ultrason...

Embodiment 2

[0067] (1) Take 0.12g SmCo 5 Disperse in 60ml of absolute ethanol, add 0.5ml of dilute hydrochloric acid, react in a water bath at 60°C for 10 minutes, remove the acid solution after the reaction, pass in Ar gas as a protective gas, and use mechanical stirring and ultrasonic dispersion;

[0068] (2) SmCo pretreated with hydrochloric acid 5 Disperse in 60ml of absolute ethanol, add 1g of PVP as a dispersant, dissolve 0.4g of NaOH in 20ml of absolute ethanol and add it dropwise to SmCo with a syringe 5 dispersion, then 3ml N 2 h 4 ·H 2 O was added dropwise to SmCo with a peristaltic pump at a rate of 0.15ml / min. 5 In the dispersion liquid, at the same time 0.0303g FeCl 2 4H 2 O dissolved in 20ml absolute ethanol and 0.0195g CoCl 2 ·6H 2 O was dissolved in 20ml absolute ethanol and added dropwise to the SmCo with a syringe 5 In the dispersion liquid, react in a water bath at 60°C for 30 minutes, pass Ar gas as a protective gas, and disperse with mechanical stirring and u...

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Abstract

The invention discloses nano dual-phase composite permanent magnet particles and a preparation method thereof. The preparation method comprises the following steps: uniformly dispersing hard magneticphase powder in a solvent to form hard magnetic phase powder dispersion liquid; in a protective atmosphere, adjusting the hard magnetic phase powder dispersion liquid to be alkaline by using an alkaline substance, and at least adding a reducing agent and a soft magnetic phase precursor material to reduce the soft magnetic phase precursor material, and performing heterogeneous nucleation and growthon the surface of a hard magnetic phase, thus obtaining the nano dual-phase composite permanent magnet particles. According to the nano dual-phase composite permanent magnet particles disclosed by the invention, the size of a soft magnetic phase can be effectively controlled within a nanoscale range and are continuously and closely arrayed on the surface of the hard magnetic phase, so that relatively strong exchange-coupling action between the soft magnetic phase and the hard magnetic phase due to waist collapse of a hysteresis curve and the fact that the soft magnetic phase cannot be continuously and closely distributed on the surface of the hard magnetic phase, which are caused by a relatively large particle size of the soft magnetic phase, is effectively avoided, and the aim of increasing a magnetic energy product is fulfilled; and furthermore, the method is mild in reaction condition, products are pure, and the method is easy to implement.

Description

technical field [0001] The invention relates to a preparation method of a magnetic material, in particular to a nano-two-phase composite permanent magnet particle and a preparation method thereof, and belongs to the technical field of preparation of two-phase composite materials. Background technique [0002] At present, there are mainly two methods for preparing dual-phase composite permanent magnets with high energy product and good thermal stability based on the exchange coupling between grains. One is the "Top-down" method with relatively mature technology at present, and the other is the relatively novel "Bottom-up" method. Among them, the "Top-down" method is to first prepare the bulk material, and then obtain the ideal microstructure of the composite material through heat treatment, etc., and finally obtain a composite magnet with good performance. This relatively traditional method includes mechanical alloying method, melt Rapid quenching method, thin film depositio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/055H01F1/057H01F41/00
CPCH01F1/0045H01F1/0551H01F1/0571H01F1/0579H01F41/00
Inventor 杜娟吕琳王凤青边宝茹郑强崔平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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