High-coercivity neodymium-cerium-iron-boron permanent magnet and preparation method and application thereof

A permanent magnet, neodymium-cerium-iron technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem of reduced residual magnetic induction intensity of magnets, lack of RE-rich phase in main phase grains, and difficulty in obtaining high-correction magnets. Tenacity, etc.

Pending Publication Date: 2022-04-05
YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the mixed-valence nature of Ce, Ce with a smaller ionic radius tends to form CeFe 2 Phase, this phase tends to exist in the form of separate grains in the magnet, so that there is a lack of RE-rich phases distributed along the grain boundaries between the main phase grains, the reverse magnetization domain is easy to nucleate and expand, and it is difficult for the magnet to obtain high coercive force
At the same time, the magnetic exchange coupling effect of the adjacent main phase grains due to direct contact also significantly reduces the residual magnetic induction of the magnet.

Method used

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  • High-coercivity neodymium-cerium-iron-boron permanent magnet and preparation method and application thereof
  • High-coercivity neodymium-cerium-iron-boron permanent magnet and preparation method and application thereof
  • High-coercivity neodymium-cerium-iron-boron permanent magnet and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0086] (1) According to the design ratio of 100% by mass: PrNd: 29wt.%, Ce: 3.7wt.%, Dy: 0.4wt.%, Co: 1.2wt.%, Cu: 0.3wt.%, Ga: 0.1wt. .%, Al: 0.53wt.%, Zr: 0.12wt.%, Ti: 0.12wt.%, B: 0.99wt.%, Fe balance, weigh raw materials, adopt vacuum induction melting furnace under the protection of Ar gas atmosphere Smelting is carried out, and the molten liquid is cast onto a quenching roll with a rotational speed of 32rpm, and the liquid casting temperature is 1400°C to obtain alloy flakes with an average thickness of 0.25mm;

[0087] (2) The alloy flakes are made into alloy powder with an average particle size of 3.7 μm by hydrogen crushing, dehydrogenation, and jet milling, and 2 Under the protection of the atmosphere, add the lubricant zinc stearate with a weight ratio of 0.05wt% of the alloy powder, and stir and mix evenly;

[0088] (3) in N 2 Under the protection of the atmosphere, the mixed powder in step (2) was filled into the mold cavity of the molding equipment mold, the o...

Embodiment 2

[0094] Example 2 adopts the same recipe, smelting, powder making, molding, and aging process as in Example 1, the only difference is that a 5-stage sintering and heat preservation process is used, and the specific sintering process is shown in Table 1.

Embodiment 3

[0111] Embodiment 3 selects the magnet after sintering and aging in Embodiment 1, and processes it into a sheet product with a length of 20 mm, a width of 20 mm, and a thickness of 5 mm. Using a dipping process, a layer of dysprosium fluoride film with a thickness of 1 mm is applied on the surface of the magnet, and then the Diffusion treatment was carried out at 900°C for 15 hours. After the diffusion temperature was cooled below 100°C, the temperature was raised to 550°C for 5 hours of aging treatment to prepare a grain boundary diffused NdCereB permanent magnet. The final magnets are subjected to magnetic performance testing.

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Abstract

The invention discloses a high-coercivity neodymium-cerium-iron-boron permanent magnet and a preparation method and application thereof. The permanent magnet has at least one of the following characteristics: the area of a grain boundary RE-rich phase in the magnet accounts for more than 4% of the whole view area; grain boundary RE-rich phases in the magnet are uniformly and finely distributed; and the average value of the ratio of the area of the bulk grain boundary RE-rich phase at the intersection of more than three main phase grains to the total area of more than three adjacent main phase grains at the periphery is less than or equal to 30%. When the prepared magnet is used as a grain boundary diffusion magnet base material, the excellent diffusion effect is achieved. The RE-rich phase in the magnet is continuously distributed along the grain boundary, so that more channels are provided for diffusion, the diffusion depth of a diffusion source towards the interior of the magnet is improved, the distribution uniformity of the diffusion source in the magnet is improved, the consistency of internal structure components of the diffusion magnet is improved, and the magnetic performance of the diffusion magnet is further improved.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnets, and in particular relates to a high-coercivity neodymium-cerium-iron-boron permanent magnet and a preparation method and application thereof. Background technique [0002] As the third generation rare earth permanent magnet material, sintered NdFeB is mainly composed of rare earth PrNd, iron, boron and other elements. Because of its excellent magnetic properties and high cost performance, it is widely used in various rare earth permanent magnet motors and smart consumer electronics. products, medical equipment and other fields. With the rapid development of low-carbon environmental protection economy and high-tech, the demand for sintered NdFeB magnets is increasing, which greatly drives the consumption of rare earth PrNd resources and makes the price of PrNd gradually increase. Ce, as a rare earth element with similar chemical properties to PrNd and the most abundant reserves, can re...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/057H01F41/02
Inventor 于永江安仲鑫刘磊张聪聪耿国强
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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