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Preparation method of a high performance and low cost composite magnet

A composite magnet and high-performance technology, which is applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problems of large-scale application of unfavorable rare earth resources, increase in magnet costs, and shortage of rare earth resources, etc., to achieve low cost and reduce Preparation cost, effect of promoting grain boundary diffusion

Active Publication Date: 2019-12-03
苏州心愿美电子商务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the scarcity and high price of rare earth resources such as Dy, Tb or Pr, and the extra process preparation of rare earth metals, rare earth alloys or inorganic rare earth compounds, the cost of preparing magnets by grain boundary diffusion technology has increased significantly, which is not conducive to the conservation of rare earth resources. and large-scale application in industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step S1. Weigh the ultrafine magnetic powder containing Nd / Pr element and CaH according to the mass ratio of about 5:2 2 Reconstitute the powder for batching, and grind the prepared mixed powder to make it evenly mixed;

[0028] Step S2, Nd 12 Fe bal B 5.5 co 4 with Ce 13.5 Fe bal B 6.5 Ga 0.1 The surface of the sintered dual main phase magnet NdCeFeB is subjected to pre-treatments such as grinding, ultrasonic cleaning, and pickling;

[0029] Step S3, coating the homogeneously mixed powder obtained in step S1 on the surface of the dual main phase magnet NdCeFeB obtained in step S2;

[0030] Step S4, placing the composite magnet coated in step S3 in a vacuum heat treatment furnace, and performing reaction grain boundary diffusion heat treatment under vacuum conditions at a temperature of 950° C. for 4 hours;

[0031] Step S5 , performing a secondary vacuum heat treatment at 500° C. for 4 hours on the composite magnet that has been diffused in step S4 , to prepar...

Embodiment 2

[0034] Step S1 Weigh the ultrafine magnetic powder containing Nd / Dy element and CaH according to the mass ratio of about 5:2 2 Reconstitute the powder for batching, and grind the prepared mixed powder to make it evenly mixed;

[0035] Step S2 will Nd 13.5 Fe bal B 6 Al 0.5 Cu 1 with Ce 12.5 Fe bal B 6 Ni 1 The surface of the hot-pressed-hot-deformed dual main-phase magnet NdCeFeB is pre-treated by grinding, ultrasonic cleaning, pickling, etc.;

[0036] In step S3, the homogeneously mixed powder obtained in step S1 is coated on the surface of the dual main phase magnet NdCeFeB obtained in step S2;

[0037] In step S4, the composite magnet coated in step S3 is placed in a vacuum heat treatment furnace, and the reaction grain boundary diffusion heat treatment is carried out under the protection of argon at a temperature of 800° C. for 2 hours;

[0038] In step S5, the composite magnet that has been diffused in step S4 is subjected to a secondary vacuum heat treatment at...

Embodiment 3

[0041] Step S1 Weigh the ultra-fine magnetic powder containing Nd / Dy / Tb elements and CaH according to the mass ratio of about 5:2 2 Reconstitute the powder for batching, and grind the prepared mixed powder to make it evenly mixed;

[0042] Step S2 will Nd 13 Fe bal B 5.5 Cu 0.5 sn 1 with Ce 12 Fe bal B 5 Cu 0.5 Ga 0.5 The surface of the sintered dual main phase magnet NdCeFeB is subjected to pre-treatments such as grinding, ultrasonic cleaning, and pickling;

[0043] In step S3, the homogeneously mixed powder obtained in step S1 is coated on the surface of the dual main phase magnet NdCeFeB obtained in step S2;

[0044] In step S4, the composite magnet coated in step S3 is placed in a vacuum heat treatment furnace, and the reaction grain boundary diffusion heat treatment is carried out under the protection condition of helium, the temperature is 850° C., and the time is 10 h;

[0045] In step S5, the composite magnet that has been diffused in step S4 is subjected to...

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Abstract

The invention provides a preparation method of a high-performance and low-cost composite magnet, relating to the preparation techniques of permanent magnet materials. The preparation method comprisesthe steps of with superfine powder recycled during neodymium iron boron jet-milling pulverization as a rare earth diffusion source, mixing the superfine powder with reducing powder, coating the surface of an NdCeFeB magnet with two main phases of Nd2Fe14B and Ce2F214B with the mixture, putting the NdCeFeB magnet into a vacuum heat treatment furnace, and carrying out grain boundary diffusion to generate reduction reaction between the superfine powder and the reducing powder so as to separate out a rare earth element RE in the superfine powder through reduction, wherein the rare earth element REcontains one or more of Nd, Pr, Dy and Tb; and diffusing the rare earth element RE into the dual-main-phase NdCeFeB magnet so as to form hard magnetic layers on the surfaces of grain crystals, and reducing the magnetic coupling effect among grain crystals so as to increase the coercive force of the dual-main-phase magnet and obtain high-performance and low-cost composite magnet. The preparation method is simple in craft process, easy in operation and low in cost and applicable to large-scale batch production.

Description

technical field [0001] The invention relates to the technical field of permanent magnet material preparation, in particular to a method for preparing a high-performance and low-cost composite magnet. Background technique [0002] NdFeB magnets are rare earth permanent magnet materials with rapid development, and are widely used in core functional devices in high-tech fields such as computers, network information, communications, aerospace, office automation, home appliances, and human health. The rapid development of NdFeB magnets has led to excessive consumption of rare earth elements Nd or Pr, Nd or Pr resources are becoming increasingly scarce, and prices continue to increase. Therefore, it is particularly important to develop low-cost rare earth permanent magnet materials containing high-abundance Ce elements, which is of great significance to the balanced use of rare earth resources. [0003] However, due to Ce 2 Fe 14 The magnetocrystalline anisotropy field of the B...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02
CPCH01F41/0293
Inventor 崔熙贵潘金鑫崔承云王兴华程晓农许晓静
Owner 苏州心愿美电子商务有限公司
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