Rare earth permanent magnet and its preparation method

A rare earth permanent magnet and magnetic powder technology, which is applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve problems such as difficult to control, uncontrollable, and uneven distribution of magnetic properties of magnets, and the method is simple to achieve and avoid oxidation deformation. Effect

Active Publication Date: 2018-07-24
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the magnets prepared by the hot molding process, because the magnets are in a state of free deformation, the deformation of different parts is quite different and difficult to control, so the magnets have uneven distribution of magnetic properties in the axial and radial directions; The ring magnet prepared by the process has the characteristics of radiation orientation, but the magnetic performance of the ring magnet is low due to the low and uncontrollable deformation of the magnet during the back extrusion process

Method used

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  • Rare earth permanent magnet and its preparation method
  • Rare earth permanent magnet and its preparation method
  • Rare earth permanent magnet and its preparation method

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preparation example Construction

[0029] The present invention provides a kind of preparation method of rare earth permanent magnet, and it comprises the following steps:

[0030] S1, providing a magnetic powder, and making the magnetic powder into a preformed blank;

[0031] S2, heating the preformed blank under vacuum or protective atmosphere conditions, and then rolling the preformed blank by at least one roll to deform the preformed blank to obtain a rare earth permanent magnet.

[0032] In step S1, the source of the magnetic powder is not limited, it can be quenched magnetic powder, HDDR magnetic powder (HDDR magnetic powder refers to the magnetic powder obtained by hydrogenation-disproportionation-dehydrogenation-recombination) and the like. The quenched magnetic powder can be self-made or commercially available. The preparation process of the quenched magnetic powder can be: (a) batching according to the ratio of each element in the quenched magnetic powder; (b) mixing the prepared raw materials and me...

Embodiment 1

[0042] The commercially available MQU-F magnetic powder was hot-pressed into a preformed blank. The shape of the preformed blank was a cuboid with a cross-section of 40mm×13mm and a thickness of 20mm.

[0043] The preform is placed in a hot-rolling furnace, and the air pressure inside the hot-rolling furnace is reduced to less than 5.0×10 -2 Pa, and then filled with argon. Then heat the preformed blank to about 840°C, and then transfer the preformed blank to such as figure 1 Shown between a pair of rollers 2 that rotate in opposite directions. The distance between the centers of circles of the pair of rolls 2 is 6mm. Finally, a rare earth permanent magnet with a thickness of 6 mm was obtained. The ratio of the cross-sectional area of ​​the rare earth permanent magnet to the cross-sectional area of ​​the preformed blank is 30%. The orientation direction of the lamellar microstructure in the obtained rare earth permanent magnet is perpendicular to the rolling direction.

[...

Embodiment 2

[0049] The preparation method of embodiment 2 rare earth permanent magnet is basically the same as embodiment 1, and difference is: as figure 2 Three sets of rolls 2 are shown (each set of rolls 2 comprising two rolls 2 turning in opposite directions). Finally, a rare earth permanent magnet with a thickness of 6 mm was obtained. The ratio of the cross-sectional area of ​​the rare earth permanent magnet to the cross-sectional area of ​​the preformed blank is 30%.

[0050] The magnetic properties of the obtained rare earth permanent magnets were tested. See Table 2 for the results.

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Abstract

The invention relates to a preparation method of a rare earth permanent magnet, especially comprising following steps: (1), providing magnetic powder, preparing the magnetic powder into a preformed blank; (2), heating the preformed blank under a vacuum or protective atmosphere condition, rolling the preformed blank through at least one roller, causing the preformed blank to deform, thus obtaining the rare earth permanent magnet. The invention also provides the rare earth permanent magnet.

Description

technical field [0001] The invention relates to a rare earth permanent magnet with good magnetic properties and a preparation method thereof. Background technique [0002] Rare earth permanent magnet materials are permanent magnet materials based on intermetallic compounds formed by rare earth metal elements and transition metals. NdFeB permanent magnets (also known as NdFeB permanent magnets) are currently the permanent magnet materials with the highest magnetic properties. NdFeB permanent magnets are widely used in social production, life, national defense and aerospace and other fields, and have become important functional materials supporting social progress. [0003] The preparation methods of NdFeB permanent magnet materials mainly include thermal deformation method and sintering method. Compared with the magnets made by the commonly used sintering method, the magnets made by the thermal deformation method have the advantages of simple preparation process, low amount...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02B22F3/18B22F3/14
CPCB22F3/14B22F3/18B22F2003/145B22F2998/10H01F41/0266
Inventor 尹文宗陈仁杰靳朝相唐旭剧锦云朱帅李东闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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