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Neodymium-iron-boron permanent-magnet material and preparation method thereof

A permanent magnet material, neodymium iron boron technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problem of high-performance permanent magnet material cost rising, achieve the effect of increasing working temperature and reducing cost

Inactive Publication Date: 2013-01-30
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the rapid rise in the price of rare earth raw materials, the cost of high-performance permanent magnet materials containing the above-mentioned rare earth elements continues to rise. Therefore, how to obtain low-cost, high-performance NdFeB permanent magnet materials has become an urgent problem for those skilled in the art. question

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0042] The preparation method of the NdFeB permanent magnet material provided by the present invention is similar to the existing NdFeB permanent magnet material preparation method, mainly including the following steps: adding raw materials in proportion to smelting to make NdFeB ingots or quick-setting sheets, Then, after crushing, powder making, mixing, magnetic field orientation press molding, sintering and tempering under the conditions of vacuum or inert gas protection, the above-mentioned NdFeB permanent magnet material is obtained. The main improvement is: optimization The components and content of smelting, the production process are properly adjusted, and oxygen is introduced during the powder making process, the specific details are as follows.

[0043] Step 1. Ingredients smelting: Melt the raw materials of NdFeB permanent magnet materials according to their components, and use casting technology to make NdFeB ingots, or use quick-setting sheet technology to make NdF...

Embodiment 1

[0065] This embodiment 1 is used to illustrate the NdFeB permanent magnet material prepared by the present invention;

[0066] The preparation method of the NdFeB permanent magnet material provided by embodiment 1 comprises the following steps:

[0067] 1. Smelting: NdFeB ingots are made by casting process. The smelting formula of NdFeB ingots is Pr18.1Nd5Dy6.5Ho4.4Fe62Co1.5B1Ga0.2Al0.5Zr0.15Nb0.3Cu0.3 for melting, and then in inert gas Under protection, perform homogenization heat treatment at a temperature of 1060°C for 8 hours, and perform coarse crushing;

[0068] 2. Hydrogen crushing: absorb hydrogen for 2.5 hours in a hydrogen crushing furnace with a hydrogen pressure of 1.0Mpa, and then dehydrogenate at a temperature of 560°C for 6 hours to prepare the required hydrogen crushing powder;

[0069] 3. Jet mill: Add 0.03wt% antioxidant to the crushed hydrogen powder, mix well, and make a fine powder with an average particle size of 3.0um by jet mill; feed 150ppm of oxygen ...

Embodiment 2

[0075] This embodiment 2 is used to illustrate the NdFeB permanent magnet material prepared by the present invention;

[0076] Using the same formula, steps and process parameters as in Example 1, the difference is that 280ppm of oxygen is introduced into the jet milling process; NdFeB permanent magnet material A2 (composed as Pr17.8Nd4.9Dy6. 38Ho4.32Fe62Co1.5B1Ga0.2Al0.5Zr0.15Nb0.3Cu0.3O0.6).

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Abstract

The invention provides a neodymium-iron-boron permanent-magnet material of which the composition is disclosed as the following formula: R1xR2yFe100-x-y-z-u-v-p-q-w-cCozBuGavNbpAlqMwOc, wherein R1 is selected from Pr and / or Nd; R2 contains Ho, contains at least one of Dy and Tb, and contains or does not contain Gd; 5wt%<=y<=12wt%; and M is selected from one or more of Zr, Cu, Sn, Mo, V, W, Si, Hf and Ti. The invention also provides a preparation method of the neodymium-iron-boron permanent-magnet material. The preparation method provided by the invention can lower the cost on the premise of keeping the magnetic properties of the neodymium-iron-boron permanent-magnet material basically unchanged.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a neodymium-iron-boron permanent magnet material and a preparation method thereof. Background technique [0002] In 1983, Japan's Sumitomo Metal Corporation invented NdFeB permanent magnet materials for the first time. Since its inception, NdFeB permanent magnet materials have been widely used in many fields such as automobiles, computers, electronics, machinery, energy, and medical equipment due to their advantages such as high magnetic energy product, relatively low price, and sufficient resource reserves. In particular, NdFeB has a high cost performance ratio, so it has become an ideal material for the manufacture of magnetic functional devices with high efficiency, small size, and light weight, and has had a revolutionary impact on many application fields. [0003] At present, the sintering method is often used in the industry to produce NdFeB permanent magnets. For example...

Claims

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Application Information

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IPC IPC(8): H01F1/057B22F3/16
Inventor 廖超邓小霞张法亮
Owner BYD CO LTD
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