Method for producing rare-earth magnet

A manufacturing method and rare earth technology, which are applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problems of inability to obtain rare earth magnets, and achieve the effect of improving coercivity.

Inactive Publication Date: 2013-05-08
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, rare earth magnets having satisfactory coercive force cannot be obtained by these known techniques.

Method used

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  • Method for producing rare-earth magnet
  • Method for producing rare-earth magnet
  • Method for producing rare-earth magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] 1. Fabrication of quenching zone

[0079] With the atomic number ratio of Nd, Fe, Co, B, and Ga at the ratio of 14:76:4:5.5:0.5, weigh the specified amount of Nd, Fe, Co, B, and Ga, and use an arc melting furnace to make an alloy cast piece. Next, the alloy ingot was melted at high frequency in a single-roll furnace, and the copper roll was sprayed under the following single-roll furnace operating conditions to form a quenched strip.

[0080] Conditions of use of single roller furnace

[0081] Injection pressure 0.4kg / cm 3

[0082] Roll speed 2000rpm~3000rpm

[0083] Melting temperature 1450℃

[0084] Based on magnetic separation, Nd containing amorphous 14 Fe 76 co 4 B 5.5 Ga 0.5 Composed of quenching zone.

[0085] The obtained nanoparticle structure band was partially sampled, and the magnetic properties were measured by VSM, and it was confirmed that it was hard magnetic. In addition, the crystal particle diameter of the nano particle organization band i...

Embodiment 2

[0096] In addition to using sintered bodies, and using figure 2 The pressing device shown in (C) was subjected to intense heat processing under the following conditions, and anisotropy was performed in the same manner as in Example 1 to obtain a molded body, and the same as in Example 1 was performed except for using this molded body The contact treatment was performed for 1 hour in a NdCu liquid phase at 580°C.

[0097] Strong heat processing conditions

[0098] 20% compression processing at a deformation rate of 1.0 / s at 650-750°C (plastic processing rate: 20%)

[0099] The results of the demagnetization curves measured for the obtained rare earth magnets are shown together with other results in figure 1 middle.

Embodiment 3

[0101] Except for using a sintered body and performing intense heat processing under the following conditions, anisotropy was performed in the same manner as in Example 1 to obtain a molded body. The contact treatment was performed for 1 hour in the NdCu liquid phase.

[0102] Strong heat processing conditions

[0103] 40% compression processing at a deformation rate of 1.0 / s at 650-750°C (plastic processing rate: 40%)

[0104] The results of the demagnetization curves measured for the obtained rare earth magnets are shown together with other results in figure 1 middle.

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Abstract

To provide a method for producing an anisotropic rare-earth magnet that can be enhanced in coercive force without adding a large quantity of rare metals such as Dy and Tb. [Solution] A method for producing a rare-earth magnet, including a step of bringing a compact, which is obtained by hot-working a sintered compact having a rare-earth magnet composition to provide anisotropy thereto, into contact with a low-melting-point alloy melt containing a rare-earth element.

Description

technical field [0001] The present invention relates to a method for producing a rare earth magnet capable of increasing coercive force, and more specifically, to a method for producing a rare earth magnet capable of increasing coercive force without adding a large amount of rare metals such as Dy and Tb. Background technique [0002] As magnetic materials, if roughly classified, there are hard magnetic materials and soft magnetic materials. In comparison between the two, hard magnetic materials are required to have high coercive force, and soft magnetic materials are required to have low coercive force but higher maximum magnetization. . [0003] The characteristic coercive force of the hard magnetic material is a property related to the stability of the magnet, and the higher the coercive force, the better it can be used at high temperatures. [0004] As one of magnets made of hard magnetic materials, NdFeB-based magnets are known. It is known that this NdFeB-based magne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02B22F1/00C22C28/00C22C33/02C22C38/00H01F1/053H01F1/08
CPCC22C38/005B22F3/1028H01F41/005H01F1/0577B22F3/14H01F41/0266H01F1/0576H01F41/0273B22F3/1035H01F1/0571B22F1/00C22C28/00H01F1/053H01F41/02
Inventor 庄司哲也宫本典孝大村真也一期崎大辅山本武士
Owner TOYOTA JIDOSHA KK
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