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Preparation method of neodymium iron boron permanent magnet material

A permanent magnet material, neodymium iron boron technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of small amplitude and poor adhesion

Inactive Publication Date: 2014-07-02
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention solves the poor cohesive force between the attachment on the surface of the magnet matrix and the magnet matrix and the attachment particles in the prior art, and at the same time, the magnet with a certain content of Dy and / or Tb can increase the coercive force by diffusion. To solve the major technical problems, provide a method for preparing high-performance NdFeB permanent magnet materials with strong coercive force, simple process, low cost, and attachments that are not easy to fall off

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0011] The invention provides a preparation method of NdFeB permanent magnet material, comprising the steps of: attaching an attachment on the surface of an NdFeB magnet body, then sintering under the protection of vacuum or an inert gas, and then performing aging treatment; the attachment including (R1 x R2 y ) a T b m c A d h e Alloy powder; wherein, R1 is Dy and / or Tb, R2 is at least one element selected from La, Ce, Pr, Nd, Sm, Ho, Y and Sc, T is iron and / or cobalt, and M is selected from Al , Cu, Zn, Sn, Ga, Ge, Nb, V, W, Ti, Ni, Zr, Ta, Mn, Cd or Mo at least one element, A is boron and / or carbon, H is hydrogen, 40wt %≤a≤80wt%, 1wt%≤c≤20wt%, 0wt%≤d≤5wt%, 0.2wt%≤e≤1wt%, b is the balance, x≥10wt%, y≥0wt%, and x+ y=100wt%, said (R1 x R2 y ) a T b m c A d h e The oxygen content of the alloy powder is 1000ppm or less. The prepared NdFeB permanent magnet material has high coercive force, excellent comprehensive performance, simple process, low cost and easy reali...

Embodiment 1

[0028] (1) Preparation of the magnet matrix: by weighing a predetermined amount of metal Nd, Dy, Fe, Cu, Al and iron-boron alloy with a purity of at least 99%, heating and melting at high frequency under an argon atmosphere, and adopting a quick-setting thin strip process Preparation of alloy flakes, the final alloy composition is Nd 28 Dy 3 Fe 67.73 B 0.97 Cu 0.1 Al 0.2 . Absorb hydrogen under 0.9 Mpa hydrogen pressure for 4 hours, and dehydrogenate at 560°C for 6 hours to prepare the required hydrogen powder. Add 0.04wt% antioxidant to the crushed hydrogen powder, mix well, and make a fine powder with an average particle size of 3.3um through jet milling, and then shape it in an orientation field with a magnetic field size of about 2.0 T, and undergo isostatic pressing at 200Mpa Hold for 120s, sinter at 1090°C in an inert gas or a relatively high vacuum, and hold for 5 hours to obtain a magnet block. Use a diamond cutter to machine all the surfaces of the magnet block ...

Embodiment 2

[0040] (1) Preparation of the magnet matrix: by weighing a predetermined amount of metal Nd, Dy, Fe, Cu, Al and iron-boron alloy with a purity of at least 99%, heating and melting at high frequency under an argon atmosphere, and adopting a quick-setting thin strip process Preparation of alloy flakes, the final alloy composition is Nd 28 Dy 3 Fe 67.73 B 0.97 Cu 0.1 Al 0.2 . Absorb hydrogen under 0.9 Mpa hydrogen pressure for 4 hours, and dehydrogenate at 560°C for 6 hours to prepare the required hydrogen powder. Add 0.04wt% antioxidant to the crushed hydrogen powder, mix well, and make a fine powder with an average particle size of 3.3um through jet milling, and then shape it in an orientation field with a magnetic field size of about 2.0 T, and undergo isostatic pressing at 200Mpa Keep 120s for sintering at 1090°C under inert gas or higher vacuum, and keep for 5h. The magnet block is obtained, and all surfaces of the magnet block are machined with a diamond cutter to ma...

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Abstract

The invention provides a preparation method of neodymium iron boron permanent magnet material. The method includes: attaching attachment on the surface of a neodymium iron boron magnet parent, sintering under the protection of vacuum or inert gases, and performing aging treatment. The attachment comprises (R1xR2y)aTbMcAdHe alloy powder, wherein R1 is Dy and / or Tb, R2 is at least one of La, Ce, Pr, Nd, Sm, Ho, Y and Sc, T is iron and / or cobalt, M is at least one of Al, Cu, Zn, Sn, Ga, Ge, Nb, V, W, Ti, Ni, Zr, Ta, Mn, Cd and Mo, A is boron and / or carbon, H is hydrogen, 40wt%< / =a< / =80wt%, 1wt%< / =c< / =20wt%, 0wt%< / =d< / =5wt%, 0.2wt%< / =e< / =1wt%, the balance of b, x> / =10wt%, y> / =0wt%, x+y=100wt%, and the oxygen content of the (R1xR2y)aTbMcAdHe alloy powder is lower than 1000ppm. Compared with the prior art, the neodymium iron boron permanent magnet material has the advantages that the residual magnetism (Br), coercive force (Hcj) and maximum magnetic energy product ((BH)max) are increased.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a preparation method of an NdFeB permanent magnet material. Background technique [0002] Since the first commercial development of NdFeB rare earth permanent magnet materials by Sumitomo Metal of Japan and GM of the United States in 1983, it has been widely used in electronics, communications, motors, medical equipment and other fields due to its characteristics of high remanence and high magnetic energy product. According to forecasts, the use of NdFeB permanent magnet materials in motors such as electric vehicles and hybrid vehicles will become one of the directions for the largest growth in demand for NdFeB permanent magnet materials in the future. Such motors require magnets with high remanence. Stubbornness Hcj. At present, the most commonly used method is to use Dy or Tb to replace part of Nd. Replacing Nd in Nd2Fe14B with these elements increases the anisotropy field an...

Claims

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Application Information

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IPC IPC(8): H01F1/057B22F7/08
Inventor 张法亮邓小霞
Owner BYD CO LTD
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