A method for improving the coercive force of an arc-shaped NdFeB magnet

A technology of NdFeB and coercive force, which is applied in the field of coercive force improvement of arc-shaped NdFeB magnets, can solve the problems of low applicability, low utilization rate of heavy rare earth, simple operation and high applicability

Active Publication Date: 2021-04-20
YANTAI DONGXING MAGNETIC MATERIALS INC
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Problems solved by technology

[0007] Aiming at the problems in the prior art, the present invention provides a method for increasing the coercive force of an arc-shaped NdFeB magnet, which overcomes the shortcomings of the above-mentioned prior art such as low applicability or low utilization rate of heavy rare earths, and provides a main The coercivity improvement method suitable for arc-shaped NdFeB magnets makes the utilization rate of heavy rare earth elements high, and the method of the present invention is easy to operate and has high applicability

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  • A method for improving the coercive force of an arc-shaped NdFeB magnet
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preparation example Construction

[0033] The preparation of the heavy rare earth coating is to prepare a heavy rare earth slurry by mixing heavy rare earth elements with organic binders and organic solvents, and use screen printing to screen a layer of heavy rare earth slurry on the surface of the flexible film and dry it to form a heavy rare earth coating. Rare earth coating.

[0034] The heavy rare earth element is any one of pure metal, alloy or compound powder, and the heavy rare earth element is dysprosium or terbium, wherein the selected pure metal, alloy or compound powder has a particle size of 1-200 μm. The organic adhesive is a resin adhesive or a rubber adhesive, and the organic solvent is a ketone, benzene or ester thinner.

[0035] The weight ratio of the heavy rare earth element in the heavy rare earth coating on the surface of the flexible film to the weight of the curved NdFeB magnet 1 to be coated is 0.1%-1.5%.

[0036] After the above material selection is completed, proceed as follows.

[...

Embodiment 1

[0046] see figure 1 , figure 2 , a coercivity enhancing method for an arc-shaped NdFeB magnet, comprising the following steps:

[0047] like figure 1 As shown, the arc-shaped NdFeB magnet with a thickness of 1 mm is placed vertically with the convex surface upward, and the pure Dy powder with an average particle size of 1 μm is mixed with a resin-based adhesive and a benzene-based thinner to form a heavy rare earth slurry. Use screen printing technology to screen-print a layer of heavy rare earth film on a flexible plastic film with a thickness of 0.05mm, and ensure that the shape and surface area of ​​the heavy rare earth film are consistent with the convex surface of the arc-shaped magnet by controlling the pattern and mesh of the screen. The shape and surface area are consistent, and the weight ratio of heavy rare earth to the arc magnet to be coated is 0.1%.

[0048] Transfer the flexible film 3 coated with the heavy rare earth coating 2 directly above the convex surfa...

Embodiment 2

[0055] In this embodiment, a heavy rare earth coating is formed on an arc-shaped NdFeB magnet with a thickness of 15 mm. Pure Tb powder with an average particle size of 100 μm is mixed with a rubber-type adhesive and a ketone thinner to form a heavy rare earth slurry. Screen printing technology screen-prints a layer of heavy rare earth film on a flexible plastic film with a thickness of 0.2 mm. The weight ratio of heavy rare earth to the weight of the arc-shaped magnet to be coated is 1.5%. Stage diffusion at 850°C for 72h, aging treatment at 550°C for 15h, and the rest are similar to Example 1.

[0056] After the diffusion is completed, test the magnetic properties of the arc-shaped magnet, and take the magnetic properties of the arc-shaped magnet before diffusion as Comparative Example 2, fill in the above test results in Table 2, and compare and confirm the diffusion effect of the arc-shaped magnet after diffusion.

[0057] Table 2

[0058] Br (KGs) Hcj (KOe)...

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Abstract

The invention belongs to the technical field of magnetic materials, and in particular relates to a method for increasing the coercive force of an arc-shaped NdFeB magnet. The present invention mixes and stirs the heavy rare earth powder with an organic binder and an organic solvent to form a heavy rare earth slurry, and uses screen printing to coat a layer of heavy rare earth slurry on a flexible film and solidify to form a heavy rare earth coating, and then Transfer the heavy rare earth coating to the surface of the arc-shaped magnet to be diffused and use pressure to keep the heavy rare earth coating and the surface to be diffused tightly, and then perform high-temperature diffusion on the arc-shaped NdFeB magnet bonded with the heavy rare earth coating Aging treatment to improve the coercive force of NdFeB magnets. This method can form a uniform and controllable heavy rare earth coating layer on the surface of the arc-shaped NdFeB magnet to ensure uniform diffusion on the arc surface of the magnet, and greatly improve the utilization rate of heavy rare earth materials by screen printing and transfer coating .

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and in particular relates to a method for increasing the coercive force of an arc-shaped NdFeB magnet. Background technique [0002] Sintered NdFeB permanent magnet materials have excellent magnetic properties and are widely used in the fields of computers, automobiles, medical care and wind power generation. With the development of high-speed wind power generation and new energy vehicles, there is a higher demand for NdFeB magnets. Requirements, it is required to maintain high magnetic properties under high temperature and high speed operation, which requires the development of high remanence and high coercive force magnets. And in different application fields, due to the consideration of the optimal design of the magnetic field, NdFeB magnets will be designed into various shapes to cope with the influence of different fields and parts. The common shapes can be mainly divided into squ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02
CPCH01F41/0266H01F41/0293B41M1/12H01F1/0576
Inventor 杨昆昆王传申彭众杰丁开鸿
Owner YANTAI DONGXING MAGNETIC MATERIALS INC
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