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Rare earth magnet and method for producing same

A technology of rare earth magnets and manufacturing methods, which is applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., which can solve problems such as deterioration, deterioration of magnetic properties of rare earth magnets, and reduction of magnetic properties, and achieve the effect of suppressing deterioration

Pending Publication Date: 2022-07-01
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the magnetic properties of the surface portion are lower than those of the inside, and the magnetic properties of the rare-earth magnets may deteriorate. In particular, in motors for electric vehicles, the possibility of deterioration of the magnetic properties due to demagnetization of the rare-earth magnets is high.

Method used

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  • Rare earth magnet and method for producing same
  • Rare earth magnet and method for producing same
  • Rare earth magnet and method for producing same

Examples

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Embodiment

[0129] Hereinafter, the rare earth magnet of the present invention and the method for producing the same will be described more specifically with reference to examples.

reference example 1

[0131]First, a sintered body before being formed into an Nd-Fe-B-based magnet precursor was prepared. Next, by grinding the entire surface of the sintered body, a rectangular parallelepiped magnet body having a width (W) of 5 mm, a length (L) of 20 mm, and a height (H) of 3 mm was obtained. In this way, a rare-earth magnet having all of the constituent surfaces as the original magnet body of the processed surface obtained by the removal process was produced.

reference example 2

[0133] First, the primary magnet obtained in Reference Example 1 was prepared, and the primary magnet was arranged in the powder of the Nd-containing alloy, so that the entire constituent surfaces of the primary magnet were arranged in the powder of the Nd-containing alloy. Thereby, the diffusion material containing the alloy powder containing Nd is made to exist on the whole of all the constituent surfaces of the magnet body.

[0134] Next, a heat treatment was performed for 30 minutes at a temperature of 900° C. in a vacuum atmosphere with respect to the original magnet body in which the diffusion material was present on all the constituent surfaces. Next, with respect to the magnet body subjected to the heat treatment, an aging treatment was performed at a temperature of 550° C. for 60 minutes in a vacuum atmosphere. In this way, a rare earth magnet including a magnet body and a processed layer of the vapor-deposited film was produced.

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Abstract

Provided are a rare earth magnet capable of suppressing deterioration of magnetic characteristics, and a method for manufacturing the same. The rare earth magnet according to the present invention is provided with a magnet element containing a rare earth element (R1), a transition metal element (T), and boron (B) and containing a main phase, and is characterized in that: a region of a constituent surface constituting the surface of the magnet element, said region being located in the vicinity of the corner of the magnet element, is a processed surface obtained by removal processing; a region of the constituent surface, which is closer to the center than a region in the vicinity of the corner, is a non-processed surface that is not subjected to removal processing.

Description

technical field [0001] The present invention relates to a rare-earth magnet and a method for producing the same, and relates to a rare-earth magnet including a magnet body containing a rare-earth element, a transition metal element and boron, and a method for producing the same. Background technique [0002] Rare earth magnets having the following magnet bodies, such as Nd-Fe-B rare earth magnets, are known as high-performance magnets having excellent magnetic properties, and are used in electric vehicles (EVs) and hybrid vehicles. For motors such as internal magnet motors (IPM motors) in electric vehicles such as (HV), the magnet body contains rare earth elements, transition metal elements, and boron, and includes a main phase and exists so as to surround the main phase and is connected to the main phase. A sub-phase containing more rare earth elements than the phase. In such rare-earth magnets, while the main phase exhibits strong magnetic properties, the sub-phases magne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0253H01F41/0286H01F41/0293B22F3/16B22F3/24B22F2003/247B22F2003/248
Inventor 高泽真由美芳贺一昭一期崎大辅伊东正朗高马久典佐野新也小森健祐金田敬右
Owner TOYOTA JIDOSHA KK