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Thermal deformation rare earth permanent magnet material and preparation method thereof

A rare earth permanent magnet and thermal deformation technology, which is applied in the direction of magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., can solve the problems of the magnetic properties of materials with grain growth, improve the magnetic isolation effect, and reduce the melting point of the main phase , the effect of reducing stress

Pending Publication Date: 2022-01-14
GRIREM ADVANCED MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing technical solutions, the thermal deformation temperature is usually around 800°C, and the thermal deformation temperature is too high. Excessively high thermal deformation temperature will lead to excessive growth of grains and limit the improvement of the magnetic properties of the material.

Method used

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  • Thermal deformation rare earth permanent magnet material and preparation method thereof
  • Thermal deformation rare earth permanent magnet material and preparation method thereof
  • Thermal deformation rare earth permanent magnet material and preparation method thereof

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preparation example Construction

[0051] As analyzed in the background technology, the preparation of heat-deformed rare earth permanent magnets in the prior art has high heat deformation temperature and high requirements for equipment. In order to solve this problem, the present invention provides a low-temperature heat-deformable rare earth permanent magnet material and its preparation method .

[0052] The invention provides a kind of preparation method of rare earth permanent magnet, it comprises the following steps:

[0053] S1, providing a main alloy magnetic powder a and an auxiliary alloy powder respectively;

[0054] S2, mixing the two powders in S1 and performing heat treatment under vacuum or protective atmosphere conditions, uniformly diffusing the auxiliary alloy powder into the main alloy magnetic powder a to obtain magnetic powder b;

[0055]S3, hot-pressing the magnetic powder b under vacuum or protective atmosphere conditions to obtain a hot-pressed magnet;

[0056] S4, subjecting the hot-pr...

Embodiment 1

[0075] Prepare the heat deformable magnet according to the following steps:

[0076] 1) According to atomic percentage (Nd 0.9 Ce 0.1 ) 13.8 Fe 76.1 co 4 Ga 0.5 B 5.6 The ingredients are batched and then melted into master alloy ingots by induction melting. In an argon atmosphere, the molten master alloy ingot was sprayed onto the surface of a rotating water-cooled roller to obtain a quenched strip. The roller surface speed was 33m / s, the quenching temperature was 1340°C, and the spray pressure was 0.06MPa. The obtained quick-quenched strip is mechanically crushed into main alloy magnetic powder a with a particle size of 100 microns to 250 microns.

[0077] 2) According to atomic percentage Pr 68 Cu 32 The ingredients are batched and then melted into master alloy ingots by induction melting. Spray the molten master alloy onto the surface of the water-cooled roll in an inert atmosphere to obtain a quenched auxiliary alloy strip, wherein the roll surface speed is 20m / s...

Embodiment 2

[0083] Prepare the heat deformable magnet according to the following steps:

[0084] 1) According to atomic percentage (Nd 0.8 Ce 0.2 ) 13.8 Fe 76.1 co 4 Ga 0.5 B 5.6The ingredients are batched and then melted into master alloy ingots by induction melting. In an argon atmosphere, the molten master alloy ingot was sprayed onto the surface of a rotating water-cooled roller to obtain a quenched strip. The roller surface speed was 33m / s, the quenching temperature was 1320°C, and the spray pressure was 0.06MPa. The obtained quick-quenched strip is mechanically crushed into main alloy magnetic powder a with a particle size of 100 microns to 250 microns.

[0085] 2) According to atomic percentage Pr 68 Cu 30 Al 2 The ingredients are batched and then melted into master alloy ingots by induction melting. Spray the molten master alloy onto the surface of the water-cooled roll in an inert atmosphere to obtain a quenched auxiliary alloy strip, wherein the roll surface speed is ...

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Abstract

The invention relates to a thermal deformation rare earth permanent magnet material and a preparation method thereof. Raw materials of the thermal deformation rare earth permanent magnet material comprise main alloy magnetic powder a with the chemical formula being (R11-cCec)xFe100-x-y-zM1yBz according to atomic percent and auxiliary alloy powder with the chemical formula being R2a(Cu1-bM2b)100-a according to atomic percent, wherein 0 <= c <= 1, 12 <= x <= 15, 0 <= y <= 10, 5 <= z <= 7, R1 is at least one of Nd, Pr, Dy, Tb, Ho, La and Gd, M1 is at least one of Si, Mn, Al, Co, Ga and Cu, 60 <= a <= 90, 0 <= b <= 1, R2 is at least one of Nd, Pr, La and Ce, and M2 is at least one of Al, Zn, Ga, Sn and In. According to the material, the low-melting-point auxiliary alloy is diffused into the main alloy powder, so that the melting point of a grain boundary phase of the main alloy magnetic powder is reduced, meanwhile, the proportion of the grain boundary phase is increased, the hot pressing temperature can be reduced to 650 DEG C or below, and the heat deformation temperature can be reduced to 700 DEG C or below, therefore, grain growth is effectively prevented, and the coercive force is improved.

Description

technical field [0001] The invention relates to a thermally deformed rare earth permanent magnet material and a preparation method thereof, belonging to the technical field of rare earth permanent magnet materials. Background technique [0002] Rare earth permanent magnet materials are permanent magnet materials based on intermetallic compounds formed by rare earth metal elements and transition group metal elements. NdFeB permanent magnets are currently the most magnetic permanent magnet materials. They are widely used in the fields of automobiles, air conditioners, wind power generation, national defense and aerospace, and are important functional materials that support social progress. [0003] At present, the preparation methods of fully dense NdFeB permanent magnets mainly include sintering method and thermal deformation method. Compared with the sintering method, the thermal deformation method has the advantages of low rare earth consumption, good corrosion resistance,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02B22F1/00B22F3/14B22F3/24C22C38/10B22D11/06
CPCH01F1/0576H01F41/0266B22F3/14B22F3/24C22C38/005C22C38/10C22C38/002B22D11/0611
Inventor 彭海军于敦波白馨元权宁涛李天昊闫文龙王子龙武凯文朱胜杰
Owner GRIREM ADVANCED MATERIALS CO LTD
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