Process For Preparing Rare Earth Magnets

A rare earth and magnet technology, applied in the direction of magnetic objects, magnetic materials, permanent magnets, etc., can solve the problems of reduced productivity, achieve high productivity, reduce manufacturing costs, and improve magnetic properties

Inactive Publication Date: 2015-07-01
HYUNDAI MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the grain boundary diffusion method generally includes vapor deposition and sputtering,

Method used

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  • Process For Preparing Rare Earth Magnets
  • Process For Preparing Rare Earth Magnets
  • Process For Preparing Rare Earth Magnets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0041] In an exemplary embodiment, a method of manufacturing a rare earth permanent magnet may include:

[0042] Obtain NdFeB sintered magnet;

[0043] applying a mixed powder comprising a Zn-containing metal and a Tb- or Dy-containing metal compound to the surface of the sintered magnet; and

[0044] The heat treatment is performed on the sintered magnet to which the mixed powder is applied.

[0045] Specifically, the NdFeB sintered magnet may have the composition of Chemical Formula 1:

[0046] [chemical formula 1]

[0047] Re a m b Fe c B d

[0048] Re may be at least one rare earth metal selected from Nd, Dy, Tb, and Pr, and Re mainly includes Nd. M may be at least one metal selected from Co, Al, Cu, Ga, Zr, and Nb. a is a real number from 25 to 35; b is a real number from 0 to 10; d is a real number from 0.1 to 5; c is the remainder when the sum of a, b, c and d is 100; and a, b, c and d is the weight percentage (wt%) of each element based on the total weight of...

Embodiment 1～10 and comparative example 1～3

[0072] [1] Manufacture of sintered magnet

[0073] A NdFeB sintered magnet having the following composition A1 was used as the sintered magnet.

[0074] Table 1

[0075]

[0076] A sintered magnet can be produced as follows.

[0077] Mixtures were prepared by mixing Nd, Pr, Dy, Tb, Fe, Co, B, Al, and Cu in the amounts listed in Table 1. The mixture was melted in a high-frequency melting furnace at a temperature of about 1300° C. to 1550° C., and produced into NdFeB flakes by a strip casting method. Subsequently, the NdFeB flakes were roughly ground through hydrogenation and dehydrogenation, and pulverized to have a size of about 3 μm to 5 μm using a jet mill in an inert atmosphere. The pulverized powder was prepared into a molded product using a magnetic field compression molding machine, and the direction of the magnetic field was perpendicular to the pressing direction. The molded product is sintered and heat-treated under vacuum to obtain a sintered body.

[0078] [...

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Abstract

Disclosed is a method of producing a rare earth permanent magnet, comprising: obtaining a NdFeB sintered magnet; applying a mixed powder including a Zn-containing metal and a metal compound containing Tb or Dy onto a surface of the sintered magnet; and heat-treating the sintered magnet having the mixed powder applied on its surface.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2013-0168492 filed in the Korean Intellectual Property Office on December 31, 2013, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates to methods of making rare earth magnets. The method may include performing a heat treatment for diffusion on a magnet having a mixture of a Zn-containing metal or an alloy thereof and a rare earth compound such as fluoride applied on its surface. The invention also relates to rare earth magnets produced by the method of the invention. Background technique [0004] Rare earth permanent magnets such as Nd-Fe-B based permanent magnets have excellent magnetic properties and have been used in smaller motors with higher power. Furthermore, its utility is developed in a wide range of applications such as permanent magnets for various home ...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057B22F1/00B22F3/10B22F7/00
CPCH01F41/0293H01F1/0572H01F1/0577H01F7/02H01F41/005
Inventor 李在领朴建慜郑然骏
Owner HYUNDAI MOTOR CO LTD
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