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, inductors/transformers/magnets, and magnetic objects, can solve the problems of lack of rare-earth-rich grain boundary phases and difficulty in entering rare-earth-rich grain boundary phases, so as to promote The effect of formation and optimization

Active Publication Date: 2017-03-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
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Problems solved by technology

However, traditionally prepared HDDR magnetic powder generally utilizes ingot alloys, and HDDR grains are formed from the initial grains of ingot alloys, and the rare earth-rich grain boundary phase in the initial grains of ingot alloys is originally around the large grains , in the process of HDDR, large grains are disproportionated and recombined into ultrafine grains, the rare earth-rich grain boundary phase is difficult to enter and evenly distributed in the final ultrafine grains, resulting in a lack of rich rare earth grain boundary phase

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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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[0038] The invention provides a method for preparing a thermally deformed rare earth permanent magnet material, which comprises the following steps:

[0039] S1, providing main magnetic powder and low melting point alloy powder respectively, wherein the chemical formula of the main magnetic powder is Re by mass percentage x Fe 100-x-y-z m y B z , where Re is one or more of Nd, Pr, Dy, Tb, La, Ce, M is one or more of Al, Co, Cu, Ga, 20≤x≤40, 0≤y≤ 10, 0.7≤z≤1.5, the chemical formula of the low melting point alloy powder is Re in mass percentage a Cu 100-a , where Re is one or more of Nd, Pr, Dy, Tb, La, Ce, 60≤a≤90;

[0040] S2, uniformly mixing the main magnetic powder and the low melting point alloy powder to obtain a mixed magnetic powder, wherein the mass proportion of the low melting point alloy powder in the mixed magnetic powder is greater than 0 and less than or equal to 10%; and

[0041] S3, subjecting the mixed magnetic powder to hydrogenation-disproportionation-de...

Embodiment 1 to Embodiment 3

[0074] In composition Nd 30.3 PR 0.1 Ga 0.46 co 4.1 Fe bal. B 0.92 Add low-melting point alloy powders with a grain size of 100 microns to 350 microns to the rapidly solidified alloy magnetic powder with a grain size of 30 nanometers to 50 nanometers, and mix them evenly. The addition amount and type of the low-melting point alloy powder in Examples 1 to 3 are different, please refer to Table 1 for details.

[0075] Put the mixed magnetic powder into the rotary hydrogen heat treatment furnace, heat the magnetic powder to 840°C in the hydrogen atmosphere, and keep the hydrogen pressure in the cavity at 50kPa, so that the mixed powder can diffuse in the hydrogen atmosphere, so that the low-melting point alloy can fully diffuse, and at the same time A sufficient disproportionation reaction occurs. When the disproportionation reaction is complete, turn off the hydrogen controller and work together with the vacuum system to maintain a vacuum of 3kPa in the chamber. After the ...

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Abstract

The invention relates to a preparation method of a thermal deformation rare-earth permanent magnet material. The method comprises the following steps of (1) providing main magnetic powder and low-melting-point alloy powder separately, wherein a chemical formula of the main magnetic powder is Re<x>Fe<100-x-y-z>M<y>B<z> according to the mass percent, the chemical formula of the low-melting-point alloy powder is ReCu<100-a>, Re is one or more of Nd, Pr, Dy, Tb, La and Ce and a is smaller than or equal to 90 and greater than or equal to 60; (2) mixing the main magnetic powder with the low-melting-point alloy powder evenly to obtain mixed magnetic powder, wherein the mass ratio of the low-melting-point alloy powder in the mixed magnetic powder is greater than 0 and smaller than or equal to 10%; (3) carrying out hydrogenation-disproportionation-dehydrogenation-recombination treatment on the mixed magnetic powder and diffusing a low-melting-point alloy in the treatment process to obtain HDDR magnetic powder; and (4) sequentially carrying out hot-press molding and deformation molding on the HDDR magnetic powder to obtain the thermal deformation rare-earth permanent magnet material. The invention further provides the thermal deformation rare-earth permanent magnet material.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnets, in particular to a thermally deformed rare earth permanent magnet material with uniform structure and excellent magnetic properties and a preparation method thereof. Background technique [0002] As one of the two major material pillars of today's information society, permanent magnet materials are widely used in computer technology, information technology, aerospace technology, communication technology, transportation (automobile) technology, office automation technology, home appliance technology and human health and health care technology Wait. Among them, NdFeB permanent magnets (also known as NdFeB permanent magnets), as the third-generation rare earth permanent magnet materials, are currently the permanent magnet materials with the highest magnetic properties. [0003] The hot pressing / hot deformation process is one of the important methods to prepare high-performance,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0576H01F41/0266
Inventor 王海航陈仁杰尹文宗靳朝相剧锦云李东闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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