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Device for preparing NdFeB magnet, NdFeB magnet and preparation method thereof

A neodymium iron boron and magnet technology, which is used in the manufacture of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve the problems of slow sample preparation, reduced production efficiency, limited vacuum hot pressing continuous production capacity, etc., and achieves the preparation cost. Low, easy to operate, efficient continuous production effect

Active Publication Date: 2020-08-04
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

However, this method needs to achieve demoulding at room temperature, so every time a sample is made, it needs to vacuumize, heat up and cool down, which makes the preparation of the sample extremely slow, which limits the continuous production capacity of vacuum hot pressing and reduces production efficiency.

Method used

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  • Device for preparing NdFeB magnet, NdFeB magnet and preparation method thereof
  • Device for preparing NdFeB magnet, NdFeB magnet and preparation method thereof
  • Device for preparing NdFeB magnet, NdFeB magnet and preparation method thereof

Examples

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preparation example Construction

[0038] The device for preparing NdFeB magnets provided by the present invention, the NdFeB magnets and their preparation methods will be further described below in conjunction with the accompanying drawings.

[0039] see Figure 1 to Figure 3 , The invention provides a device for preparing NdFeB magnets. The device includes a mold 1, a pair of horizontal molding heads (not marked in the figure) and a pair of vertical molding heads (not marked in the figure). Both the horizontal molding head and the vertical molding head are placed inside the mold 1 and are used for the preparation of NdFeB magnets.

[0040] For details, please refer to figure 1 , the mold 1 includes a horizontal channel 1a and a vertical channel 1b that communicate with each other and partially overlap each other. The area where the horizontal channel 1a overlaps with the vertical channel 1b is the mold cavity 1c. The height of the mold cavity 1c is H, and the length of the mold cavity 1c is L. The pair o...

Embodiment 1

[0068] First, the commercial MQU-F magnetic powder (chemical formula is Nd 29.6 PR 0.1 co 5.9 Ga 0.44 B 0.91 Fe bal ) mixed evenly with Nd-Cu alloy powder. The mass ratio of the Nd-Cu alloy powder in the obtained mixed magnetic powder is 1%.

[0069] Then, the mixed magnetic powder is placed in the cavity of the mold, and the cavity of the mold is evacuated to a degree of vacuum lower than 5×10 -2 Pa. The mold and the mixed magnetic powder are heated to a first temperature, wherein the heating device can be a coil induction heating press, and the first temperature is 670°C. In the mold cavity, the first pressure is applied to the mixed magnetic powder in the vertical direction through the third molding head and the fourth molding head, and it is kept at the first temperature for 2 minutes to obtain a preformed blank, wherein the first pressure is 200MPa.

[0070] In the mold cavity of described mould, be filled with protective gas Ar gas again, make the pressure in th...

Embodiment 2

[0080] The preparation method of the NdFeB magnet is basically the same as that of Example 1, except that the Nd-Cu alloy powder accounts for 2% by mass in the mixed magnetic powder.

[0081] The magnetic properties and mechanical properties of the obtained NdFeB magnets were tested. The results are shown in Table 1.

[0082] Table 1

[0083]

[0084] It can be seen from Table 1 that compared with Comparative Example 1, the magnets described in Example 1 and Example 2 have higher comprehensive magnetic properties and better mechanical properties. Compared with Comparative Example 2, the coercive forces of the magnets in Example 1 and Example 2 are significantly improved. Since the auxiliary phase alloy diffuses and enters the grain boundary between the long axis direction of the flaky crystal, the bending strength of the magnet in the direction parallel to the long axis of the flaky crystal is significantly improved. within range.

[0085] Depend on Figure 4 to Figure...

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Abstract

The invention relates to a device for preparing a neodymium iron boron magnet. The device comprises a mold, a pair of horizontal mold pressing heads and a pair of vertical mold pressing heads; the mold comprises a horizontal channel and a vertical channel, the horizontal channel and the vertical channel are communicated and partially overlapped, and the area where the horizontal channel and the vertical channel are overlapped is a mold cavity; the horizontal mold pressing heads are arranged in the horizontal channel, the horizontal mold pressing heads comprise the first mold pressing head andthe second mold pressing head, and the first mold pressing head and the second mold pressing head are oppositely arranged and can move reciprocatingly in the horizontal direction to achieve horizontalpressing; the vertical mold pressing heads are arranged in the vertical channel, the vertical mold pressing heads comprise the third mold pressing head and the fourth mold pressing head, and the third mold pressing head and the fourth mold pressing head are oppositely arranged and can move reciprocatingly in the vertical direction to achieve vertical pressing. The invention further provides a preparation method of the neodymium iron boron magnet by utilizing the device, and the neodymium iron boron magnet prepared through the preparation method.

Description

technical field [0001] The invention relates to a device for preparing an NdFeB magnet, an NdFeB magnet and a preparation method thereof. Background technique [0002] The hot extrusion process is one of the important means to prepare nanocrystalline NdFeB magnets. The process is simple, and the prepared magnets have fine grains and strong corrosion resistance. At the same time, due to its small grain size, it should have a higher coercive force, but the coercive force of NdFeB magnets has not been significantly improved. Therefore, improving the coercive force of hot-extruded magnets is the key to making hot-extruded magnets widely used in industrialization. [0003] At present, there are mainly two ways to improve the coercive force of magnets: (a) composition change; (b) structure optimization. The (a) method is mainly to increase the magnetocrystalline anisotropy field of the magnet by adding heavy rare earth elements such as dysprosium and terbium, thereby increasing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0576H01F41/0266H01F41/0293
Inventor 唐旭陈仁杰剧锦云靳朝相尹文宗李东闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI