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Method For Producing RFeB-Based Magnet

A production method and magnet technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve problems such as increasing the content of heavy rare earth elements RH, reducing the maximum magnetic energy product, and reducing the residual magnetic flux density

Active Publication Date: 2018-05-08
DAIDO STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At the same time, increasing the heavy rare earth element R in the RFeB magnet H The presence of the content of the magnet has a reduced remanent flux density B r and thus have a reduced maximum energy product (BH) max The problem
In addition, due to the heavy rare earth element R H It is an expensive and rare resource, and it is produced only in local areas. Therefore, from the viewpoint of stably supplying RFeB-based magnets to the market at low cost, it is not expected to increase the heavy rare earth element R H Content

Method used

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  • Method For Producing RFeB-Based Magnet
  • Method For Producing RFeB-Based Magnet
  • Method For Producing RFeB-Based Magnet

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Embodiment Construction

[0038] An embodiment of a method for producing an RFeB-based magnet according to the present invention will be described with reference to the drawings.

[0039] figure 1 A to 1D are schematic diagrams illustrating the steps of one embodiment of the method for producing an RFeB-based magnet. First, a substrate 11 comprising an RFeB-based sintered magnet or an RFeB-based thermoplastically processed magnet is prepared by a known method ( figure 1 A). RFeB-based sintered magnets can be produced by a pressing method in which RFeB-based alloy powder as a raw material is press-formed while being oriented with a magnetic field, and then sintered; or as described in Patent Document 2, by wherein RFeB-based alloy powder The powder is produced by the PLP (Pressless Process) method in which the powder is oriented in a mold without pressing and then sintered. The RFeB-based thermoplastically processed magnet can be produced by the method described in Non-Patent Document 1. The base ma...

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Abstract

The present invention relates to a method for producing an RFeB-based magnet, including: an RH-containing-substance adhesion step in which an RH-containing slurry obtained by mixing an organic solventwith an RH-containing powder that contains at least one heavy rare earth element RH selected from the group consisting of Dy, Tb and Ho, is blown, in a form of dots or a line, onto a surface of a base material including an RFeB-based sintered magnet or RFeB-based hot-plastic worked magnet which contains a rare earth element R, Fe, and B, thereby adhering an RH-containing substance to the surfaceof the base material; and a heating step in which the base material to which the RH-containing substance has been adhered is heated to a predetermined temperature at which the heavy rare earth elementRH in the RH-containing substance diffuses into the base material through grain boundaries of the base material.

Description

technical field [0001] The present invention relates to a method for producing an RFeB-based magnet containing R (rare earth elements), Fe (iron) and B (boron). More specifically, the present invention relates to a method for producing an RFeB-based magnet, which includes the following treatment (grain boundary diffusion treatment) in which a raw material powder containing RFeB-based alloy powder is oriented in a magnetic field, followed by sintering. In RFeB-based sintered magnets obtained from raw material powders, or in RFeB-based thermoplastically processed magnets obtained by subjecting the same raw material powders to hot pressing followed by hot-plastic working to orient the grains (see Non-Patent Document 1) Near the surface of the grain, the diffusion is selected from Dy (dysprosium), Tb (terbium) and Ho (holmium) (hereinafter Dy, Tb and Ho are referred to as "heavy rare earth elements R H ”), causing said diffusion to occur through the grain boundaries. Background...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02
CPCH01F41/0293H01F41/0253
Inventor 高木忍
Owner DAIDO STEEL CO LTD