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Rare-earth permanent magnet and fabrication method thereof

A rare-earth permanent magnet and magnet technology, which is applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., can solve problems such as insufficient diffusion, insignificant coercivity effect, magnet remanence and squareness deterioration

Active Publication Date: 2016-08-17
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The diffusion effect is limited by the amount of diffusion. When the amount of diffusion is small, the diffusion is insufficient and the effect of increasing the coercive force is not obvious; when the amount of diffusion is large, the remanence and squareness of the magnet deteriorate seriously, thereby reducing the performance of the magnet (See Sepehri-Amin H, Ohkubo T, Nagashima S, Yano M, Shoji T, Kato A, Schrefl T, Hono K. High-coercivity ultrafine-grained anisotropic Nd–Fe–B magnets processed by hotdeformation and the Nd–Cu grain boundary diffusion process.ActaMaterialia.2013,61:6622-6634.)

Method used

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  • Rare-earth permanent magnet and fabrication method thereof

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preparation example Construction

[0031] The present invention provides a method for preparing rare earth permanent magnets, which includes the following steps:

[0032] S1, respectively providing a master alloy magnetic powder and a low melting point alloy, and the low melting point alloy is a rare earth-transition metal alloy;

[0033] S2, hot-press forming the mother alloy magnetic powder under vacuum conditions to obtain a hot-pressed magnet;

[0034] S3, covering the low-melting point alloy on the end surface of the hot-pressed magnet, and simultaneously pressing the low-melting-point alloy and the hot-pressed magnet in an argon atmosphere to perform hot deformation molding to obtain a hot-deformed magnet;

[0035] S4, performing two-stage heat treatment on the thermally deformed magnet to obtain a rare earth permanent magnet.

[0036] In step S1, the preparation method of the low melting point alloy is specifically as follows:

[0037] S11, according to the proportion of the elements in the low melting point alloy;...

Embodiment 1

[0057] According to dysprosium copper alloy (Dy 85.65 Cu 14.35 ) The proportions of dysprosium and copper are accurately mixed, and the ingot is made in a vacuum induction melting furnace. The ingot is cut into a block of dysprosium copper alloy with an electric spark cutter, and the surface is processed with sandpaper of different sizes. Coarse grinding and fine grinding.

[0058] Set the ingredients to Nd 30 Ga 0.5 Fe bal. Co 4 B 1 The neodymium-iron-boron master alloy magnetic powder is induction heated in a vacuum environment. When the temperature rises to 200°C, the first pressure is applied to the first mold. The maximum temperature is controlled to 670°C to obtain a hot-pressed magnet, which rises from room temperature to The time for the highest temperature is 5 minutes to 6 minutes, the first pressure is 150 MPa, and the vacuum degree during the hot pressing process is better than 1×10 -1 Pa.

[0059] Put the hot-pressed blank into a second mold with a larger diameter, pl...

Embodiment 2

[0063] This preparation method is basically the same as Example 1, except that the first-stage heat treatment time in the two-stage heat treatment process is 30 minutes.

[0064] The magnetic properties of the obtained rare earth permanent magnets were tested at room temperature, and the test results are shown in Table 1.

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Abstract

The invention relates to a fabrication method of a rare-earth permanent magnet. The fabrication method comprises the following steps of (1) respectively providing mother alloy magnetic powder and low-melting point alloy, wherein the low-melting point alloy is rare-earth-transition metal alloy; (2) carrying out hot-press forming on the mother alloy magnetic powder in a vacuum condition to obtain a hot-press magnet; (3) covering the end surface of the hot-press magnet with the low-melting point alloy, simultaneously applying force on the low-melting point alloy and the hot-press magnet for thermal deformation forming to obtain a thermal deformation magnet; and (4) carrying out two-stage thermal processing on the thermal deformation magnet to obtain the rare-earth permanent magnet. The invention also relates to the rare-earth permanent magnet.

Description

Technical field [0001] The invention relates to the technical field of rare earth permanent magnets, in particular to a rare earth permanent magnet with high remanence and high magnetic energy product and a preparation method thereof. Background technique [0002] Due to the excellent comprehensive magnetic properties of rare earth permanent magnetic materials, its appearance opens a new door for downstream applications. At present, it has been widely used in many fields such as aerospace, national defense and military, instrumentation, communications, computers, automotive industry, petrochemicals, bioengineering, medical equipment, household appliances, etc., and has become one of the basic and important material foundations in high-tech and emerging industries. First, the role of clean energy, especially in wind power generation, energy-saving appliances and electric vehicles, is irreplaceable, and the production and consumption of rare earth permanent magnets are increasing y...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/0576H01F41/0293
Inventor 剧锦云陈仁杰尹文宗靳朝相唐旭李东闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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