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Preparation method of high-performance and low-cost composite magnet

A composite magnet, high-performance technology, 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, scarcity of rare earth resources, increase in the cost of magnets, etc. The effect of grain boundary diffusion and cost reduction

Active Publication Date: 2018-07-03
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 Reduce the powder for batching, and grind the 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 polished, ultrasonic cleaning, pickling and other pretreatments;

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

[0030] Step S4: Place the composite magnet coated in step S3 in a vacuum heat treatment furnace, and conduct reactive grain boundary diffusion heat treatment under vacuum conditions at a temperature of 950°C and a time of 4 hours;

[0031] In step S5, the composite magnet that has been diffused in step S4 is subjected to a secondary vacuum heat treatment at 500° C. for 4 hours to obtain a dual-primary-phase composite magnet with ...

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 Reduce the powder for batching, and grind the 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 formed hot-pressed-heat-deformed dual main phase magnet NdCeFeB is subjected to pretreatment such as polishing, ultrasonic cleaning, and pickling;

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

[0037] Step S4: Place the composite magnet coated in step S3 in a vacuum heat treatment furnace, and conduct reactive grain boundary diffusion heat treatment under argon protection, at a temperature of 800° C. and a time of 2 h;

[0038] In step S5, the composite magnet that has been diffused in step S4 is subjected to a secondary vacuum heat treatment at 550° C. for 2 hours to ob...

Embodiment 3

[0041] Step S1 Weigh the ultrafine magnetic powder containing Nd / Dy / Tb element and CaH according to the mass ratio of about 5:2 2 Reduce the powder for batching, and grind the 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 polished, ultrasonic cleaning, pickling and other pretreatments;

[0043] In step S3, the uniformly 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 reactive grain boundary diffusion heat treatment is performed under the protection of helium gas at a temperature of 850°C and a time of 10h;

[0045] In step S5, the composite magnet after the diffusion treatment in step S4 is subjected to a secondary vacuum heat treatment at 520° C. for 3 hours 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 low-cost composite magnet. Background technique [0002] Neodymium iron boron magnets are rare earth permanent magnet materials that are developing rapidly. They are widely used as 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 neodymium iron boron magnets has led to the excessive consumption of rare earth elements Nd or Pr. Nd or Pr resources are becoming increasingly scarce and prices continue to increase. Therefore, the development of low-cost rare earth permanent magnet materials containing high abundance of Ce elements is particularly important, and it is of great significance to the balanced use of rare earth resources. [0003] However, because Ce 2 Fe 14 The magnetocr...

Claims

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Application Information

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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