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Molded rare-earth magnet and process for producing same

A technology of rare earth magnets and manufacturing methods, which is applied in the directions of inductor/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., and can solve problems such as increasing magnetic properties

Inactive Publication Date: 2012-05-30
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this technique, there is a problem that the effect of increasing the magnetic properties (coercive force) at high temperature cannot be sufficiently obtained by heating from the outside.

Method used

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  • Molded rare-earth magnet and process for producing same
  • Molded rare-earth magnet and process for producing same
  • Molded rare-earth magnet and process for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] As the raw material magnetic powder, powder of Nd—Fe—B based anisotropic magnet prepared by HDDR method was used. The specific preparation steps are as follows.

[0118] First, an ingot having a composition of "Nd: 12.6%, Co: 17.4%, B: 6.5%, Ga: 0.3%, Al: 0.5%, Zr: 0.1%, Fe: remainder (mass %)" is prepared , The ingot was kept at 1120° C. for 20 hours for homogenization. Furthermore, the homogenized ingot was heated from room temperature to 500° C. and held in a hydrogen atmosphere, and further heated to 850° C. and held.

[0119] Next, after holding in a vacuum at 850° C., it was cooled to obtain an alloy having a recrystallized structure of a fine ferromagnetic phase. The alloy was pulverized under an argon atmosphere using a jaw crusher and a Braun mill to obtain rare earth magnet raw material magnetic powder having an average particle diameter of 300 μm. In addition, particles with a particle size of less than 25 μm and particles with a particle size of 525 μm or...

Embodiment 2

[0136] As the rare earth alkoxide, praseodymium triisopropoxide was used instead of dysprosium triisopropoxide to form an insulating phase composed of Pr oxide, and a rare earth magnet molded body was obtained by the same method as in Example 1 above. In addition, the Pr concentration of the praseodymium surface treatment liquid was analyzed by ICP, and the coating amount of the solution was adjusted so that the total coating amount was 40 mg per 10 g of magnet particles.

Embodiment 3

[0138] A rare earth magnet molded body was obtained in the same manner as in Example 1 above except that the raw material magnetic powder for sintered magnets was used instead of the raw material magnetic powder produced by the HDDR method as the raw material magnetic powder. In addition, the raw material magnetic powder was prepared by the following method.

[0139] An alloy compounded to have a composition of Nd: 31.8, B: 0.97, Co: 0.92, Cu: 0.1: Al: 0.24, remainder: Fe (mass %) is processed to a thickness of 0.2 to 0.2 by a strip cast method. 0.3mm thin alloy strip. Next, the alloy ribbon was filled in a container and accommodated in a hydrogen processing apparatus. Furthermore, by filling the hydrogen treatment device with a hydrogen atmosphere at a pressure of 500 kPa, hydrogen is stored in the alloy ribbon at room temperature, and then replaced with argon, and the pressure is further reduced to 10 -5 Pa, release hydrogen. By performing this hydrogen treatment, the all...

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Abstract

Disclosed is a molded rare-earth magnet (1) which comprises rare-earth magnet particles (2) and an insulating phase (3) present among the rare-earth magnet particles (2). The rare-earth magnet particles (2) have, dispersed therein, segregation regions (4) in which at least one element selected from a group consisting of Dy, Tb, Pr, and Ho has segregated. As a result, the molded magnet can retain high magnetic properties (coercive force) and have excellent heat resistance required for use in motors, etc.

Description

technical field [0001] The present invention relates to a formed magnet body and a method of manufacturing the same. The formed magnet body provided by the present invention is used for applications such as engines, for example. Background technique [0002] Conventionally, ferrite magnets, which are permanent magnets, have been mainly used as magnet moldings used in engines and the like. However, in recent years, the use of rare earth magnets with better magnet characteristics has been increasing in response to the high performance and downsizing of engines. [0003] Here, rare earth magnets such as Nd—Fe—B based magnets used in engines and the like have a problem of low heat resistance. In this regard, a method of reducing the heat generation by coating the magnet particles inside the magnet with an insulating material to three-dimensionally cut off the flow path of the eddy current has been conceived, and many reports have been made on the types and manufacturing method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02B22F1/00B22F1/02B22F3/00B22F3/02B22F3/14H01F1/053H01F1/08C22C19/07C22C38/00B22F1/08B22F1/16
CPCC22C28/00B22F1/02C22C38/005C22C19/07H01F41/0266H01F1/0577B22F3/14H01F41/0293H01F1/0572H01F1/0576H01F1/0573B22F1/16B22F1/08
Inventor 川下宜郎浦本清弘宫本隆司保田芳辉
Owner NISSAN MOTOR CO LTD
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