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A kind of thermally deformable permanent magnet and preparation method thereof

A technology of thermal deformation and permanent magnets, applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., can solve the problem of no quick-quenching powder and achieve the effect of improving mechanical properties and reducing anisotropy

Active Publication Date: 2021-06-08
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no report on the effective optimization scheme of the shape of the quenched powder in the industry.

Method used

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  • A kind of thermally deformable permanent magnet and preparation method thereof
  • A kind of thermally deformable permanent magnet and preparation method thereof
  • A kind of thermally deformable permanent magnet and preparation method thereof

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Experimental program
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preparation example Construction

[0020] One aspect of the embodiments of the present invention provides a method for preparing a thermally deformed permanent magnet, which includes:

[0021] 1) Provide quick quenching magnetic powder;

[0022] 2) performing a refinement treatment on the quenched magnetic powder to obtain a refined quenched magnetic powder with a particle size of 38-58 μm;

[0023] 3) performing heat treatment and granulation treatment on the refined quenched magnetic powder to obtain the second refined quenched magnetic powder;

[0024] 4) Carrying out hot-press forming and heat-deformation forming in sequence on the second refined and rapidly quenched magnetic powder to obtain a heat-deformed permanent magnet.

[0025] Further, the chemical formula of the quenched magnetic powder is Nd 29.8 PR 0.2 Ga 0.46 Fe bal. co 4 B 0.94 .

[0026] In some preferred embodiments, step 2) further includes: sorting the refined quenched magnetic powder, and classifying the quenched magnetic powder wi...

Embodiment 1

[0054] MQU-F powder (Nd 29.8 PR 0.2 Ga 0.46 Fe bal. co 4 B 0.94 ) for refinement treatment, and after the treatment, the required particle size quick-quenching magnetic powder particle size is screened out and the particle size is 38-58 μm.

[0055] After the refining treatment, the quenched magnetic powder is subjected to rotating heat treatment or stirring heat treatment. The temperature of the heat treatment is 500°C, and the time is 1.5h. The granulation process is carried out, and the low melting point metal Zn, Al, etc. are added, and the low melting point metal and the refined quenching magnetic powder The mass ratio is 3:100.

[0056] Weigh 33g of the refined quick-quenching magnetic powder and heat it in a vacuum environment. When the temperature rises to 200°C, start to apply the first pressure to the first mold. The maximum temperature is controlled at 670°C to obtain a hot-pressed magnet. The first pressure It is 260MPa, and the vacuum degree is better than 1...

Embodiment 2

[0060] Weigh 16.5g of the refined quick-quenching magnetic powder, and carry out rotary heat treatment or stirring heat treatment on the refined quick-quenching magnetic powder. etc., the mass ratio of low melting point metal to fine quenched magnetic powder is 5:100.

[0061] After mixing evenly with 16.5g of ordinary MQU-F powder, induction heating in a vacuum environment, when the temperature rises to 200°C, the first pressure is applied to the first mold, and the maximum temperature is controlled at 670°C to obtain a hot-pressed magnet. 1. The pressure is 260MPa, and the vacuum degree during the hot pressing process is better than 1×10 -2 Pa.

[0062] Put the hot-pressed blank into a second mold with a larger diameter, and inductively heat the hot-pressed magnet in an argon atmosphere, so that the hot-pressed magnet is deformed with a deformation amount of about 70%. When the temperature reaches the highest temperature of 835° C., keep it warm for 1 minute and 30 seconds...

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Abstract

The invention discloses a heat-deformed permanent magnet and a preparation method thereof. The preparation method includes: 1) providing quick-quenching magnetic powder; 2) refining the quick-quenching magnetic powder to obtain refined quick-quenching magnetic powder with a particle size of 38-58 μm; 3) refining the quick-quenching magnetic powder Carrying out heat treatment and granulation treatment to obtain the second refined quenched magnetic powder; 4) sequentially performing hot pressing and thermal deformation forming on the second refined quenched magnetic powder to obtain a thermally deformed permanent magnet. For the first time, the present invention reduces the shape anisotropy of the particles by changing the shape of the precursor fast-quenching magnetic powder particles, and changes the shape of the fast-quenching strips and their stacking structure without substantially reducing the magnetic properties of the thermally deformed permanent magnet to affect cracks. The resistance encountered in the expansion process finally improves the mechanical properties of the weaker direction of the thermally deformed permanent magnet, and reduces the anisotropy of the mechanical properties of the thermally deformed permanent magnet.

Description

technical field [0001] The invention relates to a heat-deformed permanent magnet, in particular to a heat-deformed permanent magnet with weakened mechanical anisotropy and a preparation method thereof, belonging to the technical field of rare earth permanent magnets. Background technique [0002] As an important functional material, NdFeB magnets have been widely used in variable frequency household appliances, hybrid electric vehicles, elevator traction machines and other fields. [0003] Due to the complex crystal structure, poor symmetry and few slip systems, NdFeB permanent magnets are brittle materials. This severely limits their machinability and application in high-precision fields. Especially dynamic loading often leads to fracture and failure of brittle materials, so in order to be able to use NdFeB magnets in dynamic environments, their low mechanical strength must be improved. [0004] Hot deformed NdFeB magnets have the advantages of low rare earth content, goo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/0576H01F41/0266
Inventor 唐扬陈仁杰尹文宗唐旭剧锦云闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI