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RFeB-based magnet

A manufacturing method and technology of magnets, which are applied in the manufacture of inductors/transformers/magnets, magnetic objects, and the application of magnetic films to substrates, etc., can solve the problems of reducing the coercivity of the indicated magnetic field resistance and so on.

Inactive Publication Date: 2014-10-01
DAIDO STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, in the case where a magnetic field is applied in a direction opposite to the magnetization of the entire magnet, in the case where a plurality of magnetic domains exist in a crystal grain, the magnetization is smoothly reversed by the movement of the magnetic domain walls, and indicates that the magnetic field resistance reduced coercive force

Method used

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Examples

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Embodiment

[0051] Examples of RFeB-based magnets actually manufactured using the method of the present invention are described below.

[0052] (a) Method of manufacturing the RFeB-based magnet of the example of the present invention

[0053] (a-1) Preparation steps of substrate before magnetization

[0054] In this embodiment, a sintered body manufactured by the PLP method is used as the base material before magnetization. Specifically, the base material before magnetization was manufactured by the following method.

[0055] First, a strip casting method was used to prepare Nd: 26.6% by weight, Pr: 4.7% by weight, Fe: 65.5% by weight, Co: 1.9% by weight, B: 1.0% by weight, Al: 0.2% by weight, and Cu: The raw alloy flakes with a composition of 0.1% by weight are hydrogen crushed and then pulverized using a jet mill, thereby producing raw alloy powders having (i) 3 μm and (ii) 4 μm average particle diameters. Hereinafter, the powder of (i) is referred to as "3-μm powder", and the powder of (ii) ...

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Abstract

The present invention provides a method of manufacturing a RFeB-based magnet, as a rare earth element R, a light rare-earth element RL, namely, Nd and / or Pr. The method comprises: a step of preparing a pre-magnetized substrate for a RFeB-based magnet from raw material alloy powder of a RFeB-based magnet, with an average particle diameter of less than 5[mu]m; a step of grain boundary diffusion treating by heating the pre-magnetized substrate to a predetermined temperature in a state in which a deposit with a heavy rare-earth element RH, which is Tb, Dy and / or Ho is applied to a surface of the pre-magnetized substrate; a step of machining precision of the pre-magnetized substrate after the grain boundary diffusion treatment to obtain the pre-magnetized substrate in the shape of the final product, thereby producing a precision-worked body; and a step of post-precision-machining heating of a precision-worked body at a temperature of 200 to 900 DEG C.

Description

Technical field [0001] The present invention involves the inclusion of R 2 Fe 14 B (R is a rare earth element) as the main phase of the RFeB-based magnet manufacturing method. More specifically, the present invention relates to a method for manufacturing an RFeB-based sintered magnet or a hot plastic processed magnet, wherein the rare earth element R is a light rare earth element R that is at least one element selected from the group consisting of Nd and Pr L . Background technique [0002] RFeB-based magnets are characterized by many magnetic characteristics such as those having a higher residual magnetic flux density than conventional permanent magnets. Therefore, RFeB-based magnets have been used in various products such as hybrid vehicles, electric vehicle motors, battery-assisted bicycle motors, industrial motors, hard disk drives, voice coil motors, advanced speakers, earphones, and permanent magnet magnetic resonance diagnostic equipment. [0003] Early RFeB magnets have co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/057H01F13/00H01F41/22H01F41/0293H01F1/0577
Inventor 梶并佳朋桥野早人下村哲也登泽雄介日南田纯平齐藤成康松山隼人
Owner DAIDO STEEL CO LTD
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