Rare earth permanent magnetic material and method for preparing same

A rare earth permanent magnet and raw material technology, which is applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of high cost, unfavorable products, and reduced coercive force, so as to reduce the cost of magnets, reduce the cost, and improve the coercive force Effect

Active Publication Date: 2013-12-04
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the technical problems of the high cost of NdFeB magnets in the prior art, which are not conducive to the development of products in the direction of lightness and smallness, and the coercive force is reduced

Method used

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Examples

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preparation example Construction

[0025] The present invention also provides a preparation method of the rare earth permanent magnet material, comprising the following steps:

[0026] S1. Melting the raw materials according to the ratio of the main phase to obtain the main phase ingot or quick-setting flakes;

[0027] S2. Melting the raw materials according to the ratio of the auxiliary phase to obtain the auxiliary phase ingot or quick-setting flake;

[0028] S3. Crushing the main phase ingot or quick-setting flake and the auxiliary phase ingot or quick-setting flake, powder making, mixing, magnetic field orientation compression molding, and sintering and tempering in a vacuum or an inert atmosphere to obtain the described Rare earth permanent magnet materials.

[0029] The preparation method of the rare earth permanent magnet material provided by the present invention is prepared by a double alloy method, specifically by adopting a main phase alloy with a low content of Dy or / and Tb and an auxiliary phase a...

Embodiment 1

[0041] (1) The main phase quick-setting flakes are prepared by using the quick-setting flake process (i.e., the stripping process), and the surface line speed of the copper roller is 1.8m / s, and the main phase quick-setting flakes are obtained, and the composition is Nd 25 Dy 5 Fe 67 co 2 B 1 ; The auxiliary phase ingot is prepared by casting process, and its composition is Pr 10 Nd 30 Ho 10 Dy 0.5 Fe 15 co 17 B 1 Al 3 Cu 2 Zr 2 Nb 6 Ga 3.5 .

[0042] (2) Breaking: The main phase quick-setting flakes are hydrogen-absorbed under 1.0Mpa hydrogen pressure for 1.5h, and dehydrogenated at 560°C for 6h to obtain the main phase hydrogen powder, and the auxiliary phase ingot is broken into auxiliary phase ingots by the same method. Phase hydrogen crushed powder.

[0043] (3) Milling: add 0.08wt% antioxidants to the main phase hydrogen crushed powder and auxiliary phase hydrogen crushed powder respectively, mix well, and then pass the jet mill respectively to prepare th...

Embodiment 2

[0048] The rare earth permanent magnet material S2 of this embodiment was prepared in the same steps as in Example 1, the difference being that:

[0049] In step (3), the main phase fine powder is mixed with the auxiliary phase fine powder at a mass ratio of 96.5:3.5 to obtain a fine powder mixture;

[0050] Through the above steps, the rare earth permanent magnet material S2 of the present embodiment is obtained (it is determined that its composition is Pr 0.35 Nd 25.175 Ho 0.35 Dy 4.842 Fe 65.181 co 2.525 B 1 Al 0.105 Cu0.07 Zr 0.07 Nb 0.21 Ga 0.122 ).

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Abstract

The invention provides a rare earth permanent magnetic material. The rare earth permanent magnetic material comprises a primary phase and a secondary phase, and the secondary phase is isolated from the primary phase or the secondary phase covers the periphery of the primary phase. The primary phase is composed of R1x1R2y1Fe(100-x1-y1-z1-w1)Coz1Bw1N1g1; R1 is selected from Pr or/and Nd, R2 is selected from at least one of Dy, Tb and Ho, 26wt%<=x1+y1<=36wt% and 0.01wt%<=y1<=10wt%; the secondary phase is composed of R3x2R4y2Fe(100-a-b-c-v-u)Coz2Bw2N2g2, R3 is selected from at least one of Pr, Nd, Dy and Tb, R4 is Ho, 35wt%<=x2+y2<=65wt% and 0.01wt%<=y2<=20wt%. The rare earth permanent magnetic material is prepared in a dual-alloy mode, is low in cost, strong in coercive force and high in magnetic induction, and a magnet of a smaller size can be used when the rare earth permanent magnetic material is applied to a motor,.

Description

technical field [0001] The invention belongs to the field of magnetic materials, in particular to a rare earth 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 the advantages of high magnetic energy product, relatively low price and sufficient resource reserves, especially NdFeB has a high performance-price ratio, so it has become a high-efficiency, small-volume, Ideal material for lightweight magnetic functional devices, revolutionizing many application areas. As we all know, permanent magnets with high coercive force and high working temperature are needed in high-performance permanent magnet materials, especially in fields such as new energy vehicles and wind power generation. Dy, Tb elements. Especially due to recent national policies and other reasons, the price of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053B22F3/16
Inventor 廖超邓小霞张法亮
Owner BYD CO LTD
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